Benedictine University Library

Apps for Academics: Reading and Annotating

  • Productivity
  • Library Research
  • Reading and Annotating
  • Writing and Citing
  • Audio and Video
  • Visualizing Information

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Annotate PDFs

  • GoodReader Robust PDF reader with advanced annotating capabilities, excellent file manager, text file reader and editor, audio/video player, Safari-like viewer for MS Office and iWorks files. Syncs with Google Docs, Dropbox and more.
  • iAnnotate Annotate, manage, search, and share PDF documents.
  • Mendeley Mendeley is a free reference manager and academic social network. Make your own fully-searchable library in seconds, cite as you write, and read and annotate your PDFs on any device.

Follow Multiple Blogs in One Place

  • Feedly The content of your RSS feeds, news sites and blogs are transformed into pocket-sized cards which load very fast and are easy to browse.
  • Flipboard View news, blogs, and social network content in a magazine-layout that emphasizes linked content, videos, and photos.

Read eBooks

  • BlueFire Reader Your go-to reading application for ePUB and PDF content, including BenU Library subscription eBooks from ebrary.
  • iBooks iBooks is an amazing way to download and read books. iBooks includes the iBooks Store, where you can download the latest bestselling books or your favorite classics
  • Kindle Read your Amazon Kindle books even if you don't have a Kindle. Automatically syncs your last page read between devices. Delete a book when you're done and Amazon keeps your copy online for later retrieval. Adjust text size, add bookmarks, and more.
  • Overdrive and Libby ebooks Use your public library's Libby app through Overdrive to download free ebooks to your device.

Read Saved Webpages Offline

  • Pocket Save articles, videos, recipes, and webpages you find online or from apps, like Flipboard and Feedly.
  • Instapaper Save, read, and manage the things you find online. Instapaper syncs the articles and videos you save so that they’re waiting for you on all your devices. You can read anything you save, even offline. Highlight and comment on text in any article so you can store it, retrieve it, quote it and share it.
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Your personal research assistant

Zotero is a free, easy-to-use tool to help you collect, organize, annotate, cite, and share research.

Available for Mac, Windows, Linux, and iOS

Just need to create a quick bibliography? Try ZoteroBib .

Meet Zotero.

Collect with a click..

Zotero automatically senses research as you browse the web. Need an article from JSTOR or a preprint from A news story from the New York Times or a book from a library? Zotero has you covered, everywhere.

Organize your way.

Zotero helps you organize your research any way you want. You can sort items into collections and tag them with keywords. Or create saved searches that automatically fill with relevant materials as you work.

Cite in style.

Zotero instantly creates references and bibliographies for any text editor, and directly inside Word, LibreOffice, and Google Docs. With support for over 10,000 citation styles, you can format your work to match any style guide or publication.

Stay in sync.

Zotero can optionally synchronize your data across devices, keeping your files, notes, and bibliographic records seamlessly up to date. If you decide to sync, you can also always access your research from any web browser.

Collaborate freely.

Zotero lets you co-write a paper with a colleague, distribute course materials to students, or build a collaborative bibliography. You can share a Zotero library with as many people you like, at no cost.

Zotero is open source and developed by an independent, nonprofit organization that has no financial interest in your private information. With Zotero, you always stay in control of your own data.

Still not sure which program to use for your research? See why we think you should choose Zotero .

Ready to try Zotero?

5 Best Tools to Annotate and Highlight Web Pages for Research and Study

These free tools let you annotate or highlight any part of a web page to share it with others or use as reference for your research.

When you share a link with someone, the relevant part is just a tiny snippet or two. Use these free tools to annotate or highlight the important part to draw attention to it.

All the apps in the article have a highlight marker (often with different colors) and a way to write sticky notes or comments anywhere on the page. Both features are excellent when you want to add notes for research and study, whether for your personal needs or friends. Beyond that, a few small features make each tool better for different needs.

1. Diigo (Chrome, Bookmarklet, Android, iOS): Annotations, Highlights, Comments on Any Web Page

Diigo is a simple highlighting tool for web pages that also lets you add comments and share with friends

Diigo is one of the oldest and most popular online annotation tools. Of course, it has changed a lot over the years, but it is a simple and reliable app to add highlights and comments to any web page at its core.

Available as a Chrome extension or a bookmarklet for other browsers, Diigo is intuitive to use. Select any text on any article, and you can highlight it in one of four colors. You can also add a small note to the highlight or a floating note anywhere on the page. You can also share notes with collaborators, and you can change their colors too. As Diigo says in its help section, you might want to mentally assign a specific purpose to each color, thus keeping your highlights organized for your eyes.

All annotations on a page can be seen quickly through the extension shortcut. You can also view and organize annotations in the web dashboard for Diigo. You can create groups in Diigo and share annotations and highlights with them and as PDFs.

Diigo is also a bookmark app, saving each page and its annotations to your account and syncing it across devices. On phones, Diigo is available as a standalone browser with many of the same features.

Download: Diigo for Chrome | Bookmarklet (Free)

Download: Diigo Browser for Android | iOS (Free)

2. Smort (Web): Annotate and Edit Articles to Share With Friends

Smort is a no-installation annotation tool to highlight text or fully edit and change the text in online articles before sharing with friends

Most annotation apps will only let you add highlights, sticky notes, and comments to the article. Smort enables you to change the article contents itself, remove entire paragraphs or images, add text, etc. And you don't need to install anything to do this either.

When you want to share any article, add "" before the URL and press Enter to open it in the Smort editor. Here, you can edit the article as you see fit, with a simple Markdown editor to change text and text formatting. Smort also supports highlights of four different colors, so you can add a note at the top of the article about what each color means. There are handy Undo and Redo buttons at the top if you make any mistakes.

Smort auto-generates a table of contents for each article to make navigation easier. As the editor, you can also switch between four different font types and a dark or light mode for easier reading. Once you've finished editing, click the Share button to generate a unique link that lasts for seven days from creation. After that, if you make further edits, you'll need to regenerate a new link and reshare.

3. Spade (Chrome): Privately Annotate and Highlight Web Pages

Spade is a fast and slick app to privately write annotations and notes on any web page

Spade is an excellent free tool to aid your research for essays and papers while keeping it private. It's a Chrome browser extension with annotation and highlighting abilities and a few other neat tricks like citations and machine-learning analysis.

Once you install the extension, Spade appears as a little button in one of the four corners of every web page (customizable by you). Click the button to expand a toolbar that has an annotation pen to draw or scribble anywhere and a highlight marker. You can control the point size for each and choose from seven different colors. Spade also lets you form a text box anywhere on the page to write notes and has a simple eraser to take it all away. All these highlights are shared and synced to your Spade web account so that you can access them anywhere.

In our tests, sharing a page made in Spade didn't show the annotations or highlights to the recipient. Nonetheless, you can export any annotated page as a PDF file with all notes intact.

Apart from these annotation features, Spade includes a built-in citation tool for research papers that automatically cites pages in leading journals. It also uses machine learning to rate a web page's credibility and summarizes large text into precis.

Download: Spade for Chrome (Free)

4. (Web, Chrome): Collaborative Annotations and Highlights on the Web is the best free app to annotate and highlight web pages collaborating with friends, and even writing comments and notes

If you're working with a study group or a team on a research project that needs to share links with annotations, Hypothesis is as good as it gets. This Chrome extension is much lighter than others and focuses on the ability to collaborate. Plus, it's ad-free and has no hidden costs or restrictions.

All users will need to sign up for a Hypothesis account before installing the extension. Then, create a private group if you wish to keep your shares confidential with your friends, or use the default Public tab let anyone see the annotations.

On any web page, you can select text to turn it into a highlight or an annotation (i.e., highlight with a note). Each of these shows up in your Hypothesis sidebar in chronological order for that page. Collaborators can add comments and reply to each annotation individually. You can also add a note on any page which appears in the Notes section.

The Hypothesis web dashboard makes it easy to search through all your highlights and notes. Along with a full-text search, you can add advanced operators (like username, group name, URL, or tag) to find what you're looking for quickly.

Download: Hypothesis for Chrome (Free)

5. LINER (Browsers, Mobile): Best Cross-Platform Highlight Tool, Also for YouTube

Liner is one of the best online annotation apps and has been for years, especially with its recent updates. Its broad support for different platforms makes it the go-to choice if you're switching between phones, tablets, and computers but need one place to collect all your highlights.

Once you create an account and log in, you can select any text to highlight it. You can also add a comment to any highlight and share this with friends and collaborators. The free basic account only lets you work with one color for the highlighter and limits you to 15 highlights per page. For more colors and unlimited highlights, you need the Premium package.

Liner also works with YouTube, which makes it stand apart. You can highlight any part of a YouTube video, much like highlighting text on a web page. This worked well for us on browsers but not on mobiles.

The app has a few other features worth checking out, like how it shows the most popular highlights by other users on any page. And the dashboard can distinguish between text and video highlights.

Download: Liner for Android | iOS (Free)

Download: Liner for Chrome | Edge | Safari | Whale (Free)

Use Colors as Your Own Organizing System

Whichever annotation tool you use, there's a nifty hack suggested by multiple users and app blogs. Since most of them let you use different colors for highlighting or annotation, use these colors for your own tagging or organizing system.

For example, when you highlight text in yellow, it means "worth reading," but when you highlight it in red, it means "use as-is in the research paper." Do that for all the colors. No one other than you needs to know what each color signifies, but as long as you are consistent with how you use them, it'll give you a useful system.

Modern research platform for school and work

Modern research and writing platform for school & work

See the scrible pdf viewer/annotator in action, powerful tools to save, manage, annotate & share the web..


scrible Edu

For Students For Educators For Administrators

Awesome advanced academic features

Free upgrade for students & educators

For close reading, research & writing

Google account

Sign up and sign in with your Google account. No separate password to remember.

Google Chrome

Use the Chrome Extension to work with online articles while browsing the Web.

The missing productivity app for modern digital work

Despite knowledge moving to the Web and most folks using it daily for school and work, many still use Desktop Era methods to work with it. That’s archaic, laborious and a waste of time. We're changing that.

scrible grew out of a personal need by our CEO that’s shared by infovores of all ages and interests around the world.


papers annotation app

PaperShip comes with PDF annotation tools to help you emphasize interesting results.

In addition to text highlighting, we provide notes and drawing features which go far beyond most of the reference managers (available through in-app purchase on iPad and iPhone). And as our tools are compliant with the PDF standard, your annotations will always be available in other readers.

papers annotation app

PaperShip keeps your articles organized and synchronized with your Mendeley or Zotero library.

Add a paper to your favorites or move it to another folder by using an incredible pane and swipe navigation. Your papers will always be at your fingertips with the built-in search engine.

papers annotation app

You have found a new incredible article?

Just share it with colleagues by email or on social networks like Twitter and Facebook, and bring reference managers to the science 2.0 step.

papers annotation app

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Annotate your PDFs and never forget an important idea

Highlight text and add notes right when you read the paper.

New : Paperpile for iOS , Android , Word

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Markup your papers in color and style

Markup and annotate research papers

Highlight and underline the important parts of a paper.

Whether you stick with one color or devise a sophisticated color code to organize the information is up to you.

Add sticky notes

Add comments and notes to PDFs

Never forget an important idea.

Add your notes to text, tables, or images.

Create beautiful summaries

Summary of annotations of a PDF

Condense your annotations into a beautiful, printable summary.

Come back to your summary at any time and know exactly what this paper was about without re-reading it.

Always in sync, never locked in

Sync PDF annotations to Google Drive

Your annotations are directly saved to the PDF and synced to Google Drive.

Paperpile uses open standards to make sure you can read and edit your annotations with any other standards compliant program.

All your papers in one place. Nice and tidy.

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How-To Geek

5 great programs for editing and annotating pdfs.

Want to annotate, sign, or otherwise edit a PDF? You'll need a dedicated PDF editing program for that. Here are our favorite picks.

Read update

Checked content for accuracy. Updated PDF Architect 7 to version 8.

Quick Links

What is a pdf, what to look for in pdf editing software, best overall pdf editor: adobe acrobat pro dc, best adobe alternative: pdf architect 8, best free pdf editor: xodo, best for teams and enterprise: iskysoft pdf editor, best for annotation: pdfescape.

Creating or reading a PDF is simple enough, but if you want to edit or annotate a PDF without changing it to a different format (or disturbing its layout), you'll need to have a dedicated PDF editor on hand.

UPDATE: 9/30/21

PDF is short for Portable Document Format. The file format was created in the early 1990s by Adobe co-founder John Warnock , and was designed with two ends: to provide a standardized document type that could be read on any hardware or operating system, and to create a document type whose layout wouldn't be changed as it was viewed across these differing systems and hardware. Today, you can open and read PDFs through your browser, or by using a dedicated PDF reader or word processor, but you'll need separate software if you want to edit or annotate one.

PDF editors are a different beast than PDF readers or word processors. They're designed to handle one specific format and perform a limited number of tasks within that format. Here are the important features any good PDF editing software should have:

  • Editing Abilities:  It goes without saying that whichever program you choose should let you crack open a PDF and edit it. Whether you want to modify wording, insert and resize images, or change the order of the pages within a larger document, the best PDF editors should be able to handle whatever you throw at them.
  • Annotation Support:  The ability to allow single or collaborative annotation and markup is paramount. Good PDF editors should offer helpful annotation tools like highlighting, sticky notes, comment boxes, message stamps (like "approved" or "confidential"), or even freehand notes.
  • Security:  PDF editors should offer several security options for protecting sensitive data contained within your PDFs. In addition to simple password protection, some programs let you set access permissions, work with redaction tools, and even apply watermarks. These programs should support secure document signing as well.

Adobe Acrobat Pro DC

Since Adobe invented PDFs over 25 years ago, it stands to reason that it should also offer the best option for editing them. Adobe Acrobat Pro DC ($14.99/month) proves why it remains the industry standard for PDF management. The software is available for Windows and macOS systems, as iOS and Android apps, and as a Google Drive add-on .

Adobe makes it easy to create, edit, and sign PDFs (and track their activity) with its modern, intuitive interface. The software lets you compare two versions to spot differences, convert a PDF into several other formats, turn scanned documents into editable and searchable PDFs, and even edit on the fly on your smartphone.

The software can handle more advanced tasks, like adding watermarks, bookmarks, and headers; redacting or removing hidden sensitive information; and adding audio and video. And signing a PDF? No problem. Get real-time status updates when collecting legally binding signatures, and get certificate signatures. Adobe also handles simultaneous live collaboration for editing and annotating, stamps with messages, and comment exporting to Microsoft Word. Overall, if there's something you need to do to a PDF (and if you want to look right and stay secure), Adobe Acrobat is your best choice.

Learn more at Adobe

PDF Architect 8 with features

If you want a PDF editor that looks and works similar to Adobe without the Adobe price tag, check out PDFForge's PDF Architect 8 (Free, with paid options). With the app, you can open and read any PDF file, view two documents simultaneously for comparison, create PDFs from Microsoft documents or by scanning a document, and reorder, delete, or move pages within your PDF.

If you need more functionality than that, however, you'll need to upgrade to one of Architect's paid plans, which start at $69/year. In addition to the features of the free plan, paid plans give you additional functionality, like splitting PDFs into multiple documents, editing and moving text, changing font style and size, inserting page numbers and headers, inserting and editing media, adding watermarks, and converting your PDF to a variety of other formats. The biggest potential downside is that PDF Architect is only available in your browser and doesn't have companion mobile apps.

Learn more at PDFForge

Xodo PDF Editor

Xodo (Free) is a great option for those who need to edit a PDF but don't have the budget (or the desire to shell out) for a premium PDF editor. Despite being free, Xodo still packs a punch with its robust features and beautiful, modern interface (which is available online, and as iOS and Android apps). Xodo focuses on giving you a simple, clean functionality, instead of burying your document in a complicated and cluttered interface as many other editors do.

Xodo is a great option for signing documents, as it lets you create a signature with a stylus or your finger, and you can save it to use on additional future documents. Filling in forms is also a piece of cake---all you have to do is tap the field and type in your information. Want to annotate a PDF? Xodo's ample tools let you highlight and strike out passages, add sticky notes, underline for emphasis, and make freehand drawings. It even creates a summary list of annotations, which you can jump to simply by tapping on one.

If you need to have a real-time, collaborative workspace, it supports that as well, letting anyone with access jump into work and even chat. Once you've created your document, you can sync it with Dropbox or Google Drive, ensuring you're always working with the latest version. Easy and beautiful.

Learn more at Xodo

iSkysoft PDF Editor

iSkySoft PDF Editor (starts at $69/year) is a solid PDF editor for individuals and it offers support for businesses as well. It has competitive pricing options for small businesses, starting at $109 per user per year, which it backs with team management. iSkySoft's enterprise tier offers custom pricing for groups over 20, and it comes with dedicated tech support, user licensing management, on-demand development, and flexible deployment.

The PDF editor is available to both Windows and macOS users (but not as a mobile app), and it works in nine languages. Its rich interface gives you a Microsoft Word-like experience for easy annotating and editing. It lets you convert PDFs from or to other formats; create forms; edit the layout and text of your PDF; add, remove, and manipulate images; insert, remove, or flip pages within it, and lock them down with passwords, redaction tools, and permissions.

Should you want to annotate a PDF, you can enjoy doing so with drawing features, sticky notes, stamps, and comments at your fingertips, plus iSkySoft supports multi-user collaboration. One of iSkySoft's most impressive features is its optical character recognition technology, which identifies scanned text from another document and then turns it into an editable and searchable image-based PDF.

Learn more at iSkySoft


For those who will primarily be annotating PDFs rather than creating or otherwise editing them, PDFescape (Free) is a terrific program for doing so. Although its interface is far more dated than the other options, it's still fairly easy to navigate and it has all of the basic tools you'll need for annotating and lightly editing/adjusting a PDF. You can add text and images, freehand draw, whiteout or highlight existing text, add sticky notes, and add in links. It also lets you add lines, arrows, circles, rectangles, checkmarks, and strikeout text.

The basic plan gets you free online PDF annotation abilities and basic editing, as well as the ability to create forms and share your PDF documents. If you need more functionality, consider upgrading to the PDF Premium plan, which is fairly inexpensive at $5.99/month (or $2.99/month if you opt for an annual plan). This plan gives you far more editing features, if you need those in addition to annotation tools. If you want to edit existing text, download the desktop version .

Learn more at PDFescape

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25 Best Annotation Software Tools (Free & Paid Apps)

In this post, we will dive into the 25 best annotation software tools that you can use for your specific personal and business needs.


  • Flexibility in annotation tools is crucial for adapting to various data types and annotation needs.
  • Advanced annotation tools significantly reduce the time required for data labeling through automation features.
  • Ensuring data privacy and security is a paramount consideration when choosing annotation tools for sensitive projects.
  • After evaluating numerous options, we selected the top 25 annotation tools, with PDF Reader Pro ranking as #1 for its comprehensive features.
Each tool comes with its pros and cons and there is a tool suited for every need.

There are advanced online annotation tools that exist to make our lives easier , from editing notes to summarizing important information, keeping track of to-do lists, all the way to editing images and video.

We use these tools every single day and all of which have their own unique features and can help us accomplish our everyday tasks with ease.

So, What Are Annotation Tools?

3 things to consider when choosing an annotation tool, 25 best annotation tools (free and paid).

Important disclosure: we're proud affiliates of some tools mentioned in this guide. If you click an affiliate link and subsequently make a purchase, we will earn a small commission at no additional cost to you (you pay nothing extra).

Simply put, they are text or drawing tools that help us add information to text, video, or image documents and various content pieces.

They can also be used in many different types of databases, such as Scale and Doccano.

There are countless tools out there and our job is to make the search easier for you.

Each tool has its particular uses , depending on your annotation goals, there will be different options for every need.

👉🏼 There are countless paid and free apps that are available on the market today.

One of the first things to consider when deciding which is best for you is the price (or perhaps no price at all).

Whether your choice is free or paid, consider the features that come with both versions, you may be getting a great deal with the paid versions that allow you to use all the features within the app at a low cost.

On the flip side, a free tool may be best if you are using the basic features on the app and see no reason to pay for extra features. It all depends on what you plan to use the app for.

2. The Functionality

This is probably one of the most important points to consider.

Ask yourself

  • What will I be doing with this tool?
  • Why am I using this tool?
  • What can this tool do for me to make my life easier?
To make this decision simple, the tool should have the functionality you are looking for.
  • Will you be using the tool for studies and taking down notes ?
  • Will you be editing documents on a large scale and need fast and accurate software that saves you time?

Each tool possesses its own set of functional features and suits every person's specific needs.

3. Quality And Efficiency

This point all comes down to how well does the app run and how well it performs the tasks it needs to.

Many free tools may not always detect every error that needs correcting or a phrase that can be worded differently.

This is usually a consequence of insufficient QA (Quality Assurance) from the software itself.

👉🏼 Paid versions of some tools provide a more trustworthy base for picking up on errors .

However, the price may not always be worth the extra efficiency that the tool provides and there are still some effective free tools on the market, just with fewer features.

Now that you have a foundation to build upon, here are 25 tools that have made the list, both free and paid versions.

We will dive into each one's pros and cons so that you can make the best decision for your annotation wants and needs.

  • PDF Reader Pro
  • Adobe Acrobat Pro DC
  • Markup Hero
  • PDF Annotator
  • Screenlight
  • Zoho Annotator

1. PDF Reader Pro

PDF Reader Pro stands out as a remarkable annotation tool, distinguished by its user-friendly interface and comprehensive set of features. From our first-hand experience using this tool, we found it particularly efficient for a variety of tasks.

One of the key strengths of PDF Reader Pro is its versatility in handling different annotation types.

Whether it's highlighting text, adding notes, or even drawing directly on the document, the tool offers a seamless experience. The annotation process is intuitive, making it easy for users of all skill levels to navigate and utilize the tool effectively.

Here's More About Our Experience Using PDF Reader Pro

During our exploration of annotation tools, we had the chance to use PDF Reader Pro extensively, and our experience was exceptionally positive. It proved to be a highly effective tool for managing and annotating PDF documents.

Key Aspects Of Our Experience:

  • Intuitive Annotation Features: PDF Reader Pro impressed us with its wide range of annotation capabilities. The ease of highlighting, adding notes, and drawing on documents made our annotation tasks significantly more efficient.
  • Seamless Document Navigation: Managing and navigating through annotations was straightforward. This was particularly useful when working with large documents, as it allowed us to easily track and revise our annotations.
  • Multi-Platform Compatibility: We appreciated the tool's compatibility across different devices, which facilitated a seamless workflow whether we were on desktops or mobile devices.
  • Robust Security Features: The security features, including encryption and password protection, provided peace of mind when handling sensitive documents.

Overall Impression: Our experience with PDF Reader Pro was highly satisfactory. The tool stood out for its user-friendly interface, comprehensive annotation features, and robust security measures.

Our Rating: Based on our hands-on experience, we rate PDF Reader Pro a solid 4.8 out of 5 stars.

We weren't the only ones that have benefitted from using PDF Reader Pro. While doing our research we found reviews showcasing others' experiences.

Pros And Cons

PDF Reader Pro has a free trial available.

After the trial period, you can subscribe for a once-off price of $79.99/lifetime.

2. Adobe Acrobat Pro DC

Image Source: Adobe Acrobat

With Adobe Acrobat Pro DC you can access PDF documents and comment, edit, share, add virtual sticky notes and send files amongst friends and colleagues with ease.

Adobe Acrobat Pro has many features which allow for the sharing of PDF files, converting, combining, and editing documents all in one place. You can convert PDF documents to:

  • PowerPoint (PPT)
  • Images to PDF format

There are unlimited projects to work on within the software and you can be sure to have all your work under one roof, making it that much easier and convenient.

papers annotation app

This tool is not free and requires a monthly subscription of $14.99.

While this can work out to be a bit expensive annually, the features that come with Adobe Acrobat Pro DC and its high quality make the purchase more worthwhile.

  • Many PDF conversion options
  • Efficient editing features
  • Easy to navigate
  • Effective sharing capabilities
  • Available on mobile
  • Easy participation
  • Simple PDF management
  • Frequent updates
  • The editing tab is quite clunky

Adobe Acrobat Pro DC is supported on Windows, Mac, and Mobile.

papers annotation app

Markup is one of Kdan Mobile's apps that provide basic tools that function at the highest level of productivity.

Markup is perfect for business professionals, but also for students who need to edit and summarize work at the click of a finger. From PDF files to website content, you can work on almost anything.

With Markup, you can collaborate with your entire team and make document review simple. Markup has an AI Auto Summary feature that allows all your work to be summarized quickly.

Summaries can be saved on your device for when you want and need to review workflow and make some changes.

Markup is a free-to-use tool. There are, however, Inn-App purchases that can be bought to add extra features to the app, should you need them.

  • Easy to use
  • Sufficient features with the free version
  • AI Auto Summary feature
  • Convenient collaboration
  • The browser extension can be buggy
  • Mobile version occasionally slow

Markup is available as a web extension on both Windows and Mac, it is only available on iOS Mobile devices and tablets.

papers annotation app

With ClickUp, you can expect to create informative internal and external documents, edit existing docs and create wikis and impressionable knowledge bases.

ClickUp allows you to edit and create most files , from PDF documents all the way to Google Docs.

ClickUp boasts many features, but some of its key features include:

  • Commenting on documents
  • Notes tools
  • Syncing calendars
  • Arranging and organizing multiple priorities, and formulating checklists

There are over 100 exclusive features within this annotation app.

ClickUp allows for numerous app integration, including Slack, Google Drive, Dropbox, Microsoft Teams, and Zoom, just to name a few.

It is an advantage to have an annotation app that possesses screen-sharing options like those found in Zoom and Microsoft Teams.

For the most part, ClickUp is free to use but can be upgraded to the 'Unlimited' package for only $5 per month when paid on an annual basis or $9 per month when paid monthly.

  • Over 100 features
  • Numerous app integration
  • Displays status of projects
  • AIO (All In One) functionality
  • Connect projects with others
  • Great UI (User Interface)
  • Complex learning curve
  • App stalls at times
  • Limitations with mobile version

As mentioned above, ClickUp has a web and mobile version. It is available on Windows, Mac, and Mobile, as well as Tablets.

5. Markup Hero

papers annotation app

Markup Hero is an annotation and screenshot tool with the main objective of improving communication and productivity.

This free tool allows you to take scrolling screenshots of any basic application window or any Chrome tab.

Even though Markup Hero has various features, here are its key features:

  • Screenshots
  • Crop and resize canvas
  • Annotate screenshots , images PDF’s, and URL's
  • Chrome, Google Drive, Slack App, and Annotation API integrations

The Sidekick and Hero plans are both free and enable you to have access to Markup Hero’s basic features.

However, you can decide to upgrade to the Superhero plan for $4 per month (billed annually). This plan was designed for professionals and other teams who need access to all their features without limiting their access.

  • Free version available
  • Annotating PDF’s
  • Simple UI design
  • Edible and accessible from any device
  • Share links to screenshots
  • It is still a newer product

Markup Hero is available on Windows, Mac, and Linux (Beta).

6. NoteLedge

papers annotation app

NoteLedge is known for its use as a digital notebook that can be used by creatives for inspiration, creative processing, and its multimedia tools make for exciting mood board creation.

Share files and ideas with teammates and clients and create top-notch presentation content too.

NoteLedge allows you to interact with projects like never before and its sketching tools are some of its users' favorite features to use.

NoteLedge has a flexible workspace and lets you arrange your content in however many layers and pages you would like.

  • NoteLedge has three pricing plans.
  • The first plan is free and is only available on iOS devices.
  • The second plan is $2.49 per month and is only available on iOS devices.
  • The third and final plan is $4.99 per month and is available on Android, iOS, Windows, and Mac.
  • Many features with each plan
  • Effective and efficient
  • Ads in the free plan
  • Occasionally crashes

NoteLedge is available on Windows, Mac, Android, and iOS and is dependent on the price plan.

7. zipBoard

papers annotation app

zipBoard is a web-based annotation and visual feedback tool for almost all types of digital assets . With it, you can review all your online proofs on a centralized platform and get rid of the endless email chains and screen-sharing meetings.

zipBoard lets you annotate images, videos, webpages (static and live), SCORM, PDFs, etc. and simplifies your visual bug tracking & QA process for reviewers.

zipBoard’s vast array of annotation tools lets you markup directly on top of your screen and share them across the team and stakeholders. It has an easy-to-use, simple UI, especially useful while getting feedback from non-technical clients and stakeholders, which is often the need.

All of these are without creating an account for the guest clients , letting you assign and prioritize the tasks from its dashboard.

With the traceability of all versions and changes and a clear designation of roles, zipBoard helps ensure confusion-free collaboration for all, whether you’re an agency or an individual.

zipBoard comes with 3 different plans and they offer a 15-day free trial in each of them.

  • Team, Agency, Enterprise: Custom ( Contact zipBoard )
  • Unlimited collaborators and projects.
  • The biggest range of annotation tools.
  • Provide your stamp of approval and sign-off creatives.
  • Integrate the product into your ERP. API creation on demand.
  • Best in class sharing features.
  • There is no mobile app.
  • The user community isn’t that big but the active support makes up for it.

zipBoard is entirely web-based.

8. Filestage

papers annotation app

Filestage is another tool known for its online proofing ( reviewing and approving) of files, including PDFs, videos, images, designs, and audio (making it ideal for speech tool use).

The app's key features include complete commenting tools, sorting files all in one place, and tracking the progress of your files.

With Filestage, one of its powerful features is the automation of file sharing which has allowed for a faster return time of a document's reviews and approvals.

There is no limit to the number of files that can be shared and there is an unlimited reviewer option, send projects to as many people as you like.

Filestage can be integrated with many other apps, with some being Google Drive, Dropbox, Zoom, and Asana.

This makes feedback and approval easy for everyone.

Filestage is not a free-to-use tool, it does have a free trial option, otherwise, it has four pricing options to choose from.

  • The first option is called the 'Essential' and it starts off at $10.66 per month.
  • The second option is called 'Advanced' and starts at $22.50 per month.
  • The third option is called 'Professional' , starting at $46.18 per month.
  • The fourth and final option is known as 'Enterprise' and the amount is determined over email or phone call depending on the business needs.
  • Fast return time on reviews and approvals
  • Unlimited amount of file shares
  • Integration with other useful apps
  • Time-saving
  • Uploading speed can be slow
  • Feature limitations for pro plan

Filestage is available on Windows and Mac.

9. Annotate

papers annotation app

Annotate allows you to directly draft documents within the app and allows for collaboration throughout the writing process.

A key feature of Annotate is its easy fact-checking system .

You can paste information from another document into Annotate, and it will provide a link to the original source, making it easy to credit references.

Share your documents with people you trust, Annotate allows groups to have discussions about projects and share ideas all within a safe space. You give permission to those you would like to see your files.

Review and edit documents too with ease, and all editing takes place within Annotate , no need to download any files to edit later.

One of the easiest and efficient fact-checking tools out there.

Most of Annotate's functions and features are free to use , however, there are plans for larger teams who need more customizable features. The price for these plans is determined by the number of users and the extra features they require.

  • Organized User Interface
  • File protection
  • Fact-checking system
  • The free version offers a limited amount of file space
  • Can be slow at times

Annotate is available on Windows and Mac and offers basic viewing functions on Mobile.

papers annotation app

With nTask, it is a select tool for project management . Teams can use this annotation software to plan and analyze important everyday tasks and collaborate with one another on project planning.

nTask offers strategic features that aid in streamlining and managing the resources of projects.

This app also provides useful budgets and other financial summaries to keep track of all the necessary facts and figures.

One of nTasks popular features is their Kanban Boards (project management visualization tool).

Users can visualize projects with Gantt charts (illustrate project schedules) by making use of the Kanban boards and planning their project's process. There are many ready-made board templates to choose from too.

There are four pricing plans that nTask provides.

  • The first plan is free and is recommended for freelancers.
  • The second plan is a ' Premium ' plan and is recommended for SMEs and Startups at $2.99 per month, per user.
  • The third plan is a ' Business ' plan, recommended for larger corporate institutions at $7.99 per month, per user.
  • The fourth and final plan is an ' Enterprise ' plan and the price is determined on demand .
  • Easy to use and collaborate
  • Efficient and effective project management
  • Use of Kanban boards
  • Streamlined deadline view
  • Great integration with other apps (Slack and Zapier)
  • Not enough customization options
  • Attaching documents and images can be tricky

nTask is available on Windows, Mac, and Mobile.

papers annotation app

Miro is a fast, simple-to-use visual collaboration software that doubles up as a robust documentation and note-keeping tool. At first glance, Miro might seem like just a digital whiteboard — but its capabilities go far beyond that.

It’s designed to let your team collaborate effectively no matter where or when you work. Used by over 45 million people worldwide, Miro has the right tools , tech, and templates to go from idea to execution.

It’s why the platform quickly becomes your central project hub , and a way to always stay connected to your team. You can explore one of Miro’s many ways to communicate — including sticky notes , charts, graphs, and videos.

Miro is designed to fit into your hybrid workflow , and boasts of over 1,000 ready-made templates including mind maps, Kanban boards, Gantt charts, product wireframes , research boards, and flowcharts.

It’s trusted by 99% of the Fortune 100, and used by teams at TransUnion, HP, Upwork, Cisco, Qlik, and Atkins.

  • Free forever plan available
  • Intuitive and easy setup
  • Built-in communication features for streamlined collaboration
  • Visitor/guest accounts locked to paid plans only
  • Zooming can be jumpy on larger projects
  • Free version does not allow high-quality export to PDF

Miro has four pricing options.

  • The free plan is free forever, but is limited to three boards
  • Starter package , priced at $10 per use r per month
  • Business package , priced at $20 per user per month
  • Enterprise package , available at a customized price

Android, Apple, Windows, Mac, Web-app

12. PDF Annotator

papers annotation app

PDF Annotator is ideal for those who want a select tool that can handle most PDF document purposes . There are many features that can assist with editing, reviewing, and enhancing PDFs.

The PDF Annotator can be used to highlight, add text, images, symbols, signatures, page numbers, and more. All your corrections and additions to the PDF are saved within the software.

You do not have to worry about you or others not being able to see your annotations within the document. You can view your edited PDFs in any PDF software.

PDF Annotator is not free but does have a free trial. It has two main license payment options . The license is operational for a year and is renewed annually.

  • The first license option is ideal for normal business functions and for 1-4 users it is priced at $69.95 per year, excluding VAT.
  • The second license option is perfect for students and university functions and for 1-4 users it is priced at $39.95 per year, excluding VAT.
  • The more users, the cheaper license is annual, with the highest number of users being more than 1000 for $2.47 per year, excluding VAT.
  • Tackles many PDF purposes
  • Performance can be slow
  • Specialized for specific annotation purposes only

PDF Annotator is available on Windows.


papers annotation app allows you to collect feedback and bug reports straight into your favorite issue tracker—without leaving your website. Digital teams and web agencies use for internal QA as well as user acceptance testing. With a widget that lives on your website, you can report bugs at the click of a button, saving your team hours in feedback management.

We used to copy/paste client emails. Now, automatically creates those issues in Jira.

The best part? This tool automatically captures URL, environment info, console logs, and every other metadata developers might need to reproduce and fix bugs. And because of its deep 2-way integrations with the most popular PM tools (Jira, Trello, Clickup...), you'll never need to spend entire weeks triaging client feedback emails or user bug reports in your inbox again. offers a Starter plan at $39/month, and more features for Team, Company, and Enterprise plans.

  • Easy to use for both your QA team and non-technical stakeholders
  • Deep integrations with over 15 PM tools
  • Intuitive, modern UI
  • All-in-one tool for both internal QA and UAT

Not ideal for mobile apps has both a web and mobile version. It is available on Windows, Mac, Mobile, and Tablets.

14. Wipster

papers annotation app

Wipster is known for its video proofing tools and is loved by creative teams who seek to review and collaborate with other creatives. Wipster allows you to invite an unlimited number of viewers and reviewers to your projects.

Along with inviting others to view your work, you are allowed to choose how your project is viewed and by whom, with Wipster's effective privacy settings.

Wipster has great integration possibilities, with other annotation software like Adobe, Dropbox, Slack, Wistia, Vimeo, and Brightcove.

Some of Wipster's key features include closed captions, threaded-comments, tracking content, and feedback controls.

Privacy is important and Wipster knows how to make its users feel at ease, knowing their work is safe and protected.

Wipster has three pricing plans.

  • The first plan is free to use for freelancers and the occasional project.
  • The second plan is ideal for teams of small or growing companies at $22.50 per month, per user.
  • The third and final plan is for large companies that have multiple teams and the price is determined based on the specific needs of a company.
  • Strong integrations (especially with Adobe)
  • Organized feedback
  • Fast editing capabilities
  • Safe and secure
  • Can be costly
  • Occasional uploading issues

Wipster is available on Windows, Mac, and Mobile.

15. Dropbox

papers annotation app

Dropbox is one of the more popular annotation source tools.

One of the main goals of Dropbox is organization and making sure that you can access different file types at anytime Dropbox handles cloud content, traditional files, and multiple web shortcuts.

Dropbox can be used for personal and business-related projects. Its features allow you to store and sync files, share files with others even if they do not have their own Dropbox account, and manage collaborations with other teams or team members securely.

Dropbox helps to make sure all your files can be accessed at any time and ensures that lost files always have a backup, so you never lose out on your progress.

Dropbox is not free and comes with six pricing plans , two for personal use and three for business use, and one free plan for either personal or business use.

  • The first plan is ideal for individuals at $11.99 per month.
  • The second plan is best suited for households at $19.99 per month and allows for six users.
  • The third plan is for solo workers at $19.99 per month.
  • The fourth plan is for growing teams at $15 per user, per month.
  • The fifth and final plan is for complex teams at $25 per user, per month.

The free plan offers limited features and is likely more suited for personal use. For additional features, the paid versions are more appealing.

  • Easy synchronization
  • Data backups
  • Vast storage with paid versions
  • Small storage with the free option
  • The app can be slow at times
  • Costly in the long-run

Dropbox is available on Windows, Mac, and Mobile.

16. Doccano

papers annotation app

Doccano is a commercial data annotation tool that specializes in-text annotation and functions as a select tool for machine learning practitioners.

Some of its key features include text analysis, sequence labeling, text summarization, and entity recognition (names, locations, and more). Each feature has its own efficient output format.

Doccano also deals with machine translations which helps translate sentences quickly into the desired languages. Doccano lets you annotate your text files in different languages too.

Doccano is a fantastic text tool for web developers and assists in completing projects in a fast and effective manner.

Doccano, however, is also one of the best text tools for users who do not possess a background in coding but need to learn how to manually label the data parallel to those with industry knowledge.

Not many open-source commercial data annotation tools can boast high optimization, but Doccano does, and it shows.

Doccano is an open-source data annotation tool, meaning it is free to use for all.

  • Free to use
  • Supports multiple languages
  • Annotation tools are collaborative
  • Completely manual annotation

Doccano is available on Windows and Mac.

17. Drawboard

papers annotation app

Drawboard is a feature-rich tool. There are two main tools in the software, Drawboard PDF and Drawboard Projects.

With Drawboard PDF, you have everything you need to edit and review PDF documents with ease and accuracy.

One of Drawboard PDF's appealing features is the drawing tools that claim to feel like you are using real ink and many users love the different pen thickness options and color tools.

The PDF editing tool is simple to use and navigate and has many image resizing tools such as rotating, inserting, cropping, and deleting pages alongside its drawing tools.

With Drawboard Projects , the features are more applicable for team collaborations. Some of the useful features include PDF markups, drawings, and edits.

Drawboard Projects features are helpful to industry professionals like architects and engineers that require details to be added to house plans, drainage systems, and so on, but can be used by any industry professional to share files.

Drawboard has three pricing plans and is not free-to-use software.

  • The first plan is known as 'Basic' and does not have unlimited project access to drawings and templates. It is $20 per month.
  • The second plan is known as 'Standard' and has unlimited project templates for $35 per month.
  • The third and final plan is called 'Enterprise' and the price is determined on the clients' needs.

There are additional features following each plan.

  • Many PDF editing features
  • Fast and efficient
  • Lags at times

Drawboard PDF is available on Windows and Drawboard Projects is available on Windows, iPad, and only iPhone mobiles.

18. Screenlight

papers annotation app

Screenlight is all about sharing your work with ease. Share files with all the available features that Screenlight offers, such as uploading video, audio speech tools, images, link sharing, reviewing, and complete commenting tools.

Once you have uploaded your files, Screenlight makes sure to develop preview files for you to choose from and enhance your projects. Formatting issues are a thing of the past with this collaborative tool.

Screenlight places an emphasis on its simplicity and time-coded comments that can be entered alongside the video where readers do not have to wait for the comment at a later stage.

It's time-coded comments are a brilliant feature that more sharing tools should offer.

Screenlight has three pricing plans.

  • The first plan is free to use and can only be available to one user.
  • The second plan is known as 'Professional' and is available to 25 users for $9 per user, per month.
  • The third and final plan is known as 'Enterprise' and is available to large companies from $500 per month depending on the needs of the company.
  • Affordable for individuals and small companies
  • Easy collaboration tools
  • Time coded comments
  • Could use more graphic customization
  • Platform availability

Screenlight is available on Windows and Android Mobile.

19. Red Pen

papers annotation app

Red Pen is a select tool offering fast feedback tools and complete commenting tools.

This app is used for visual collaborating and serves as a place for teams to share files with each other and make use of all the note tools available.

With Red Pen, most of the comments are live and users get to see comments as they happen on the page. The number of collaborators is unlimited, you can invite as many people to review your project as you like.

Red Pen keeps track of all your edited images and welcomes additional versions as you go along.

Red Pen has a free trial option, but the software does have four pricing plans. The price is determined by how many projects you are running at once.

  • The first plan is limited to 5 projects at once at $20 per month.
  • The second plan is limited to 10 projects at $30 per month.
  • The third plan is limited to 25 projects at $60 per month.
  • The fourth and final plan is limited to 40 projects at $90 per month.
  • Free trial option
  • Live commenting tool
  • Occasional bugs
  • Costly in long-run

Red Pen is available on Windows and Mac.

papers annotation app

Scale is another commercial data tool specializing in audio annotation and speech annotation aimed at NLP (Natural Language Processing).

Scale is integrated with machine learning, all you need to do is send your sensor data to Scale's API (Application Programming Interface) and it will do all the hard work.

Simply put, Scale's main objective is to transform your audio files into text translations that can be used for your specific project needs with its quality speech tools.

Scale is capable of translating different languages and converting those files into easy to handle audio snippets.

Scale can be integrated with Pilot, Google Docs, and Diffgram Data Labelling.

Scale is not a free-to-use software and the price of a plan is determined by your audio output needs. To receive a quote, contact the Scale team for more information.

  • Provides annotations for large volumes of data
  • Great customer service
  • Fast text translating
  • Reliable customer engineers
  • Not supported as an app on Windows or Mac
  • Price is not disclosed on the website

Scale is entirely web-based.

papers annotation app

Nimbus acts as an image and screencast tool that allows you to send images, videos, screencasts, and screenshots to your friends, family, and colleagues.

With Nimbus, there are many key features available to help you customize your material, like recording, annotating, and making notes on screenshots, images, or video.

Nimbus has a fast upload speed and ensures that whatever you share gets seen quickly.

Nimbus is an innovative screencast tool for teachers, it serves as an effective communicative and collaborative tool amongst teachers, parents, and students.

It recently just developed a new business feature on its platform for helpful clientele collaboration .

There are features available to every users' needs.

Nimbus has three price plans, one of which is completely free.

  • The first option is free and offers a decent amount of helpful features.
  • The second option is called 'Pro' and is priced at $4 per month.
  • The third and final option is called 'Business' and is priced at $6 per month.
  • Enhances productivity
  • Fast upload speed
  • Each plan offers enough features
  • Syncing needs work
  • The mobile app can be clunky

Nimbus is available on Windows, Mac, and Mobile.

papers annotation app

With Diigo, you can annotate web pages and PDFs while browsing the net at the same time. Diigo allows you to add sticky notes, highlight text, place tags on your favorite web pages, outline your documents and so much more.

Diigo functions well as a multi-tool but especially well as a sharing tool and you can have collaborative discussions with colleagues, classmates, or friends.

You can access your tagged web pages from anywhere and at any time with Diigo's functional archive tool.

Diigo makes use of the Cloud , whenever you are browsing, save your web notes with links and pictures to ensure you never lose track. Diigo aims to make web surfing and editing documents a lot easier.

Diigo offers four pricing plans.

  • The first plan is free but does not come with many features.
  • The second plan is called ' Standard ' and is priced per year at $40.
  • The third plan is called ' Professional ' and is priced per year at $59.
  • The fourth and final plan is called ' Business ' and it is priced per month at $10 , per user.
  • Collaborative options
  • Efficient link saving
  • Limited usage with the free version
  • Can be slow

Diigo is available on Windows, Mac, and Mobile.

23. Zoho Annotator

papers annotation app

With Zoho Annotator, you can add comments to web pages and save those comments as images . Zoho Annotator works as a screen capturing and screencast tool that allows you to share files on a personal or business level.

You can add to your web snapshots by making use of the drawing tool that the software has to offer, it's all customizable. With Zoho Annotator, you can also smudge out certain words or sentences that you would rather like to be kept private.

You don't just have to use the software for web pages, you can use it to design diagrams, infographics, and mock-ups too.

Zoho Annotator allows for integration with many apps, some of which being Facebook, LinkedIn, Cloud drive, and more.

Zoho Annotator is completely free to use making it an appealing choice.

  • Integrates with many apps
  • Privacy function
  • Cannot screenshot the full page on some websites

Zoho Annotator is available on Windows and Mac as a Google Chrome extension.

24. GoVisually

papers annotation app

GoVisually is another effective proofing software to help you get the feedback you need or need to give. GoVisually allows people to provide comments with its notes tools, on PDFs, Video, and Design content.

GoVisually is particularly aimed at Designers and Video Creators, Creative Agencies, and Marketing Teams.

Both marketing and design teams can collaborate on projects and provide feedback that is helpful and allows a project to flourish.

With this software everything is seamless and quick , there is no more need for long email chains, this cuts out the middle man.

GoVisually has two pricing plans.

  • The first plan is great for freelancers and is priced at $25 per month.
  • The second plan is suited for agencies and teams and is priced at $60 per month.
  • Practical features
  • Easy uploads
  • Optimizes workflow
  • Unable to upload images in batches

GoVisually is available on Windows, Mac, and Mobile.

25. Hypothesis

papers annotation app

Hypothesis' Annotation Process focuses on many different groups of interest. These groups include teachers, scientists and scholars, publishers and editors, and journalists.

With Hypothesis, you can embed content into texts, take notes, enrich content, and fact-check various sources.

With teaching, teachers and students can collaborate together on projects using their own annotations and sharing their projects. This allows for thought-provoking insight and conversation in the classroom.

Scholars, scientists, and publishers can benefit from sharing information with one another and adding valuable text to projects with the specific text and speech tools that Hypothesis offers.

Journalists and Editors will find comfort in knowing that the sources they are using have been fact-checked and are suitable for their or your reporting and news writing.

So many people can use this software and find features that work for them and work well.

Hypothesis is free-to-use by anybody making it even more appealing, considering all the features that come with the software.

  • Improves collaboration across the board
  • Customizes content
  • Occasionally slow

Hypothesis is available on Windows, Mac, and Mobile.

Have An Idea Of The Best Tool For You And Your Needs? đź’ˇ

The world of annotation software is an overwhelming one, but with this guide, you can be sure to make an informed decision based on everything you or your business needs to function at its best.

There is no right or wrong choice when it comes to these tools, each has its own strengths and drawbacks, you are guaranteed to find the best fit for you.

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6 Best Apps for Annotating PDFs

By Med Kharbach, PhD | Last Update: January 1, 2024

In today’s digital age, where the flow of information is predominantly online, the ability to interact with digital documents has become crucial, especially in educational settings. This is where the power of PDF annotation apps comes into play, transforming how students and educators engage with their digital texts.

papers annotation app

PDFs, known for their reliability and universal format, have long been the go-to choice for distributing educational materials, research papers, and various other documents. However, the static nature of PDFs often limits the level of interaction one can have with the content. Hence the importance of PDF annotating apps. These are tools that will help enhance the way you interact with your PDFs from highlighting text to adding notes and comments, these apps are just amazing.

Our exploration will cover a variety of apps, each with its unique features and strengths. Whether you’re looking for an app with advanced editing capabilities or one that simplifies collaboration, there’s something here for everyone.

If you are looking for tools to help you annotate web pages, you can check this collection .

Apps for Annotating PDFs

Let’s dive into the digital world of PDF annotation and discover how these PDF annotating apps can enhance your educational experience, making learning and teaching more dynamic, interactive, and efficient.

1. Adobe Acrobat Reader

Adobe Acrobat Reader is definitely one of my favourite PDF annotating apps in this list. It has helped me a lot with my readings especially during my graduate studies. Let’s first talk about the viewing features: 

Adobe Acrobat Reader provides you with an optimal reading experience through the liquid Mode and dark mode. You can choose whether to read in a single page or continuous scroll mode and with a single click you can print your PDFs. 

As for the annotation features, Adobe Acrobat Reader enables you to add notes, comments, highlights, and sticky notes to your PDFs. You can even write or draw on them. And if you are subscribed, you also have the added features of editing text and images directly in your PDFs, fixing typos, add or delete images. Additionally, you can fill in PDF forms and add your e-signature using your finger or stylus. 

Adobe Acrobat Reader also offers a number of interesting collaborative features. For instance, you can share PDFs with your colleagues or collaborators to comment on and you can collect these comments in a single file online. When you activate notifications you will be notified whenever your collaborators added their feedback.

Compatibility: iPhone/iPad and Android / Price: Free, offers in-app purchases / Age : 4+

2. Foxit PDF Editor

Foxit PDF Editor is another excellent viewing and annotating PDF app. Some of the key annotation features  Foxit app offers include the ability to edit your PDFs the way you want. For instance, you can add audios, videos, and hyperlinks to PDFs. 

You can also add or delete text and images, edit document properties, optimize PDF documents, reorganize PDF pages, fill out and save forms, add handwritten signatures to PDFs, add e-signatures to PDFs, and many more. 

The collaborative features it provides include: add annotations and stamps to shared PDFs, share PDF files and screenshots from inside the app, and more. Other interesting features include: 

Create blank PDFs from scratch or from Microsoft Office or HTML files, scan and convert paper documents to PDFs, combine PDFs to create a new PDF, convert PDFs to Microsoft Office, and many more. You can also use the app to protect your PDFs with a password.

Compatibility:  iPhone/iPad and Android /  Price:  Free, offers in-app purchases /  Age : 4+

3. Notability

Notability is an excellent note-taking and PDF annotation app which I have been using for a number of years now. Notability lets you easily import PDFs and documents and annotate them the way you like. You can also use the app’s document scanner to create searchable multi-page PDFs to share with others. 

Apps for Annotating PDFs

Other important features provided by Notability include: annotate with freehand ink, drawing, and text; add photos, GIFs, and web pages; mark up imported textbooks, lecture slides, images, class assignments, and more; audio record your notes; work with two notes side-by-side; create outlines, interactive checklists, and text boxes; publish your notes in the Notability gallery and many more.

Compatibility:  iPhone/iPad/ Mac   /  Price:  Free, offers in-app purchases /  Age : 4+

4. PDF Expert

Another popular PDF editor and viewer app. PDF Expert lets you add various forms of annotations to your PDFs. You can highlight, underline, and strikethrough. You can also insert pre-designed stamps (e.g., approved, not approved, confidential etc.); use sticky notes to add comments or use drawing tools to draw on your documents; fill out PDF forms with interactive fields such as text fields, checkboxes and radio buttons; sign documents; protect your PDFs with passwords, edit or modify existing text; and more. 

Compatibility:   iPhone/iPad and Android /  Price:  Free, offers in-app purchases /  Age : 4+

5. iAnnotate 4

Use iAnnotate 4 to annotate your PDFs using a pen, highlighter, typewriter, stamp, straight-line, note, underline, strikeout, photo, voice recording, arrow, rectangle, circle, and date stamp tools. 

iAnnotate saves your marks up in the PDF enabling you to access them on any PDF reader you use. Other interesting features provided by this app include:

  • “Compress your annotations onto the document to prevent modification. This is useful for preserving signatures or for preventing recipients from deleting or changing your annotations.
  • Open a web capture tab and find the site you want to mark up. iAnnotate will convert it to a PDF for annotation.
  • Explore your documents by thumbnails, bookmarks, annotations, or search results.
  • Open multiple documents in tabs, and easily navigate between them, on both tablet and phone.
  • Work on two documents side-by-side, for even greater productivity.
  • Arrange documents by folders and sort contents by date added, date last opened, or alphabetical order.
  • Create brand new PDFs with blank, lined, or graph-paper pages.
  • Forward a summary of your annotations as an email or a new PDF.”

Compatibility:  iPhone/iPad and Android /  Price:  $9.99 /  Age : 4+

6. PDFelement

PDFelement is both a PDF editor and scanner that enables you to read, create, edit, annotate, and convert PDFs. PDFelement also supports text recognition allowing you to extract text and images from scannable objects. 

Other interesting features provided by PDFelement include: change font size and colour of original text, edit text and images, remove cluttered backgrounds, add notes and comments, draw shapes, supports handwritten signatures and imported image signatures, fill and sign forms, convert to of from different file formats (e.g., word, excel, PPT, pages, PNG, JPEG, TIFF, GIF), combine files into a single PDF, and many more.

Compatibility:  iPhone/iPad and Android /  Price:  Free, offers in-app purchases /  Age : 4+

Final thoughts

As we conclude this exploration of the best apps for annotating PDFs, it’s evident that these tools have revolutionized the way we interact with PDF documents. In the educational sphere, where the exchange of information is constant and critical, the ability to annotate PDFs is more than just a convenience—it’s a necessity. The apps discussed each bring something unique to the table. From Adobe’s comprehensive features to Notability’s specialized note-taking capabilities, these apps cater to a diverse range of needs.

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Meet Med Kharbach, PhD

Dr. Med Kharbach is an influential voice in the global educational technology landscape, with an extensive background in educational studies and a decade-long experience as a K-12 teacher. Holding a Ph.D. from Mount Saint Vincent University in Halifax, Canada, he brings a unique perspective to the educational world by integrating his profound academic knowledge with his hands-on teaching experience. Dr. Kharbach's academic pursuits encompass curriculum studies, discourse analysis, language learning/teaching, language and identity, emerging literacies, educational technology, and research methodologies. His work has been presented at numerous national and international conferences and published in various esteemed academic journals.

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Annotate Documents Online

Annotate, comment and tag your document contents for efficient collaboration online for free.

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About Annotation app

Annotations allow users to collaborate, review documents, and add information according to context. They enable reviewers to offer feedback, editors to propose changes, and collaborators to communicate without modifying the original text.

Different file types allow users to annotate text. But processing files of a particular kind often requires specialized software that takes up a lot of space and sometimes is not free. However, you will not install a software package that is ten gigabytes or more and even pay for it to view one file. Also, you can get the file on your mobile phone, but many software packages still need mobile versions. Of course, you can get to the computer, but sometimes it takes time, and the computer may not have the necessary software.

GroupDocs.Annotation is a fast and efficient API to annotate documents of over 35 different types. Powered by a high-performance cloud-based GroupDocs server, it allows annotating files in the browser.

This free online application based on the GroupDocs.Annotation API annotates files on your device. We value your privacy, so the file is visible to you only. The application works on any device, including smartphones.

Annotation app supported document formats

Microsoft office formats.

  • Microsoft Word: DOC, DOCX, DOCM, DOT, DOTX, RTF
  • Microsoft Excel: XLS, XLSX, XLSM, XLSB, CSV
  • Microsoft PowerPoint: PPT, PPTX, PPTM, POTX, POTM, PPSM, PPS, PPSX
  • Microsoft Visio: VSD, VSS, VSDX, VST
  • OpenDocument: OTP, ODT, OTT, ODS, ODP

Other Formats

  • Portable: PDF (PDF/A-1a, PDF/A-1b, PDF/A-2a)
  • Images: BMP, GIF, JPG, JPEG, PNG, TIFF
  • AutoCAD: CAD, DWG, DXF
  • Metafiles: EMF, WMF
  • Email: EML, EMLX, MSG
  • Web: HTM, HTML
  • Others: DICOM, DjVu

How to annotate documents online

Questions and answers.

  • How can I annotate a document? First, you need to upload a file: drag & drop your file or click inside the white area to choose a file. Then you will be redirected to the annotation application.
  • How fast can I start annotating a document? The annotation app works fast. Typically it takes a couple of seconds to open a document and prepare it for adding annotations.
  • Is it safe to annotate files using this Annotator? Of course! The preview files will be available instantly after the file uploaded. We will delete the uploaded file after 24 hours.
  • Can I annotate documents on Linux, Mac OS, or Android? Yes, you can use our annotator on any operating system that has a web browser. Our Annotation App works online and does not require any software installation.
  • What browser should I use to annotate documents? You can use any modern browser to annotate documents, for example, Google Chrome, Microsoft Edge, Firefox, Opera, or Safari.

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Papers simplifies your research life by dramatically enhancing how you discover, annotate, collaborate, and cite research. Eliminate wasted hours manually wrangling information and get back to research with the Papers reference manager.

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We don’t like limiting you. With Papers you can choose where you write, our SmartCite tool is available on Google Docs, Word, and more.

With Papers’ you can organize like a pro with a suite of features built to make your world a bit more simple.

Papers' app is available on both your desktop and mobile, so regardless of where you are, how you like to do your work, or if you're team iPhone or Android, you can sync your library.

Papers’ simple, user-friendly design makes it easy for you to organize how you like, so you can get back to doing what really matters - discovering your next big breakthrough.

Papers’ advanced article metrics make it easy to understand an article’s impact on the broader research field - helping you discover new papers and understand the wider implications of your work.

How to switch to Papers

Switching your reference manager to Papers is easier than pi.

Move your existing research, including tags, lists, and folders, into Papers with our simple upload functionality.

Ensure your library is set up exactly as you want, with Papers experts just a click away to help.

Explore Papers' various features designed to make your research life easier - including Smart Lists, recommendations, and collaboration tools.

Enjoy your new reference management system and continue making world-changing discoveries.

Check out some of the common questions we receive regarding Papers.

Papers has made it simple to transfer your existing library from another reference manager into Papers. Depending on the site you are transferring from, there may be some small differences in how to import. For detailed information on how to import from various reference managers please visit our Knowledge Hub .

With Papers you are able to connect your institutional proxy to your account, enabling you to download content directly into your Papers library. In Papers, simply head into My Account and select “Edit” next to “Institution”. Then, search for your institution via our database and select. Once your proxy is enabled, you can search across your favorite sites via our browser extensions or using our internal search and recommendations.

Yes. Papers has apps for both iOS and Android - so regardless of where you fall in the iPhone/Android battle, you can access Papers wherever you go.

It is easy to upload any existing PDF articles into your Papers library. You can click the “Add” then “Add files” (top left corner next to the search bar), and select PDFs from your desktop. You can also drag and drop single or multiple PDFs from your computer directly into your Papers library.

Once you download the browser extension (we currently have versions available for Chrome, Firefox, Safari, and Edge) you can easily download PDFs with 1 click directly to your Papers library.

Built for researchers, by researchers, it is important to us that Papers is accessible to everyone. Check out our pricing page for specific details on how our pricing structure works.

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Computer Science > Computation and Language

Title: label-efficient model selection for text generation.

Abstract: Model selection for a given target task can be costly, as it may entail extensive annotation of the quality of outputs of different models. We introduce DiffUse, an efficient method to make an informed decision between candidate text generation models. DiffUse reduces the required amount of preference annotations, thus saving valuable time and resources in performing evaluation. DiffUse intelligently selects instances by clustering embeddings that represent the semantic differences between model outputs. Thus, it is able to identify a subset of examples that are more informative for preference decisions. Our method is model-agnostic, and can be applied to any text generation model. Moreover, we propose a practical iterative approach for dynamically determining how many instances to annotate. In a series of experiments over hundreds of model pairs, we demonstrate that DiffUse can dramatically reduce the required number of annotations -- by up to 75% -- while maintaining high evaluation reliability.

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ICSE Exams 2024: Check Preparation Strategy For Chemistry Paper

Consistent effort, strategic preparation and effective time management are crucial for performing well in the chemistry exam..

ICSE Exams 2024: Check Preparation Strategy For Chemistry Paper

Council for the Indian School Certificate Examinations (CISCE) will soon conduct the board exams for the Indian Certificate of Secondary Education (ICSE) or Class 10 and Indian School Certificate (ISC) Class 12 exams. The written examination of ICSE Class 10 will begin from February 21, 2024 and will conclude by March 28, 2024. While the board exam for ISC Class 12 will begin from February 12, 2024 and end on April 3, 2024.  

Preparation tips for ICSE Chemistry paper Class 10 The Chemistry paper for ICSE has two sections. Section A comprises of 40 marks, which includes objective type, case study-based and short answer questions. While, Section B has 6 questions from which students can choose 4. 

Highlighting on the preparation strategy, Vibha Gupta, principal, Orchids The International School, says, "The first 15 minutes of the paper need to be most effectively used, where students must read the paper critically. This time should be utilised to decide the four questions out of the total six that the students would want to attempt from Section B."

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The students must memorise important chemical reactions, equations and formulae, adds Ms Gupta. "This includes understanding reaction mechanisms, chemical equations and balancing reactions, which are crucial for both theoretical understanding and practical application. Solving sample papers and past papers is important for students to familiarise themselves with the exam pattern, question types, and time management. They must analyse their  performance, identify weak areas, and work on improving them."

The students must allocate time wisely during the exam, notes MS Gupta. "The time should be divided effectively between different sections and questions based on their marks and complexity. They must prioritise questions that they are confident about to maximise their score, adds Ms Gupta. "All the questions and subquestions from one section should be attempted together. The students must consolidate their understanding of key concepts, reactions, and theories through thorough revision sessions. Remember, consistent effort, strategic preparation, and effective time management are key to performing well in the chemistry exam," she adds.

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Piracy app Kimi overtook Netflix on the App Store before Apple removed it

Jacob Siegal

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Earlier this week, a vision-testing app shot up the charts on the iOS App Store. Kimi claimed to be an app iPhone owners could use to test their eyesight, but after downloading it, those users were instead presented with a sizable collection of pirated movies and TV shows. Apple finally removed the app on Tuesday, but not before Kimi made waves on the App Store.

While Kimi’s rise to power was short-lived, the app had been available on the iOS, iPadOS, and macOS App Stores since September 2023. It’s unclear how or why it remained on the App Store for so long without being noticed, but Appfigures says downloads of the app spiked this Sunday and Monday. 65,000 downloads in two days undoubtedly put Kimi in Apple’s crosshairs, and the company quickly killed it over a multitude of App Store rule violations.

Kimi’s sudden popularity and inevitable axing call to mind the Popcorn Time era , another movie piracy app that flourished on a variety of platforms in the late 2010s.

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Illegal and malicious apps occasionally sneak their way through the cracks on both Google Play and the App Store, but Apple has been on a somewhat inauspicious streak in recent weeks. Just days before Kimi’s ascent, the makers of the LastPass app published a blog post warning users about a fraudulent app called “LassPass” masquerading as their app on the App Store. The fake app was promptly removed, but how did it get through in the first place?

This article talks about:

Jacob Siegal

Jacob Siegal is Associate Editor at BGR, having joined the news team in 2013. He has over a decade of professional writing and editing experience, and helps to lead our technology and entertainment product launch and movie release coverage.

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RSA 2024 4+

Mar. 21-23,2024 in chicago, il, designed for ipad, screenshots, description.

Mar. 21-23,2024 in Chicago, IL The 70th Annual Meeting of the Renaissance Society of America will be held from March 21st to March 23rd, 2024, in Chicago, IL. Login to view Sessions and Papers saved as favorites. View schedules, locations, floor plans, and people. Attendees will now be able to facilitate their experience at the meeting using the mobile app.

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  1. Reference Management Solutions for Students, Academic & Corporate

    Dynamic Annotations & Notes Highlight, underline, strike through, make inline annotations, draw and add sticky notes. SmartCite Papers is your award winning reference manager that will improve the way you find, access, organize, read, cite and share scholarly research.

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    In addition to our full-featured web app, download Papers on your desktop (Mac/Windows) and mobile devices ... Discover new articles within the app or add our browser extensions and enjoy 1-click imports on all your favorite discovery tools ... enjoy annotation tools, clickable inline citations, linked supplements, article metrics and much more

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    Best for Annotation: PDFescape Creating or reading a PDF is simple enough, but if you want to edit or annotate a PDF without changing it to a different format (or disturbing its layout), you'll need to have a dedicated PDF editor on hand. UPDATE: 9/30/21 Checked content for accuracy. Updated PDF Architect 7 to version 8. What is a PDF?

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