Alexis Kestler
Hey there! If you‘re someone who reads a lot of articles, ebooks, or PDF documents for work or school, you‘ve likely wished for an easy way to highlight and annotate key passages to help you study and remember. That‘s where highlighter apps come in super handy!
In this comprehensive guide, I‘ll explain what highlighter apps are, why they‘re so useful, and recommend the top 8 options for both iPhone and Android. I‘ll also share tips from my experience as an avid reader and data analyst on how to use highlighter apps effectively to boost your productivity. Let‘s dive in!
What Are Highlighter Apps and Why Use One?
A highlighter app allows you to electronically highlight and annotate text in documents, webpages, ebooks, and more right from your smartphone, tablet, or computer. It‘s like having an endless supply of digital highlighter pens and sticky notes!
Here are some of the awesome benefits highlighter apps provide:
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Convenience: No need to print out or carry papers. Highlight directly on your devices!
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Organization: Your notes sync and are collected in one place for easy access later.
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Sharing: Collaboration is a breeze by sharing highlights with classmates or colleagues.
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Accessibility: Customize colors, text size, and even use text-to-speech.
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Analytics: Some apps can analyze your frequently highlighted terms and sections.
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Environmentally Friendly: Go paperless and reduce waste.
In 2021, a survey showed that 73% of students already use digital highlighters and annotating tools to study, up from just 46% in 2019. And 65% of professionals use highlighter apps to reference work documents according to RescueTime. So digital highlighters are certainly gaining popularity!
Based on my experience, here are just a few examples of how I personally use highlighter apps:
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Research: Highlight and annotate research papers and online articles for quick reference later.
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Studying: Markup course textbooks to create digital flashcards and summaries.
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Work: Comment on data points and trends in reports for data analysis projects.
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Reading: Collect favorite passages and quotes from ebooks to easily find them again.
The bottom line is that highlighter apps can help you study smarter, gain insights faster, and remember more of what you read – with just a few taps!
Key Features to Look For in the Best Highlighter Apps
The app store has tons of highlighter and PDF annotation apps to choose from nowadays. Here are the main features to evaluate to find the right one for your needs:
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Platform support – Apps available for iOS, Android, web, desktop, etc
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Highlighting tools – Color options, underline, strikethrough, fonts, etc
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Annotations – Sticky notes, drawings, images, links, voice notes
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Organization – Folders, tags, collections, search and sort
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Sharing and collaboration – Export, print, share to social media, collaborate
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Syncing – Cross-device syncing with cloud or local storage
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User experience – Intuitive interface, customizable, dark mode
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Security – End-to-end encryption, password protection
I always recommend choosing a highlighter app that syncs across your devices like phone, tablet, and computer. This allows you to seamlessly highlight while reading on one device, and then access the highlights anywhere on your other devices. Very convenient!
Also consider how you‘ll use the app – for study, work, or personal reading. Studying may require more organization features, while casual reading needs a simpler interface.
Now let‘s look at my top recommendations for Android and iPhone highlighter apps based on these key criteria.
The 8 Best Highlighter Apps in 2025
After extensively researching and testing over a dozen top-rated apps, here are my picks for the 8 best highlighter apps available today:
1. Liner – Best Overall Highlighter App
Liner is my top pick for an all-around awesome highlighter app that I use personally everyday.
It has both free and paid versions with the Pro subscription ($4.99/month) adding premium features. Liner conveniently syncs between the mobile apps and browser extensions on Chrome and Firefox.
On the free plan you get:
- 2 highlight colors
- Unlimited highlights
- 3 annotation folders
- Basic organization
Pro plan adds:
- Unlimited colors
- Unlimited folders and sub-folders
- Tags, links, embeds, search
- Team collaboration
- Analytics on reading behavior
I love Liner‘s smooth syncing across devices, extensive organization, and analytics on my reading habits over time. The interface is also clean, intuitive, and customizable.
Platforms: iOS, Android, Chrome, Firefox
Price: Free or $4.99/month (Pro)
2. Adobe Acrobat Reader – Best for PDFs
When it comes to annotating and editing PDFs, Adobe Acrobat Reader is hard to beat – plus it‘s completely free!
While Acrobat Reader lacks some more advanced features, its highlighting and annotation tools for PDFs work seamlessly. It‘s trusted by millions of users and has been my go-to for many years.
You can add comments, highlight, underline, strike out text, and more. The mobile app conveniently syncs your annotated PDFs to the cloud and across devices.
If you work with PDFs often, Adobe Acrobat Reader is likely already on your devices, and it’s a reliable choice for basic PDF markup needs.
Platforms: iOS, Android, Windows, Mac
Price: Free
3. Readwise – Best for Ebook Highlights
As an avid ebook reader, I love Readwise for easily extracting and organizing highlights from Kindle, Pocket, Instapaper, and more.
Readwise automatically syncs your highlights daily, allowing you to access them from the mobile and web apps. The free version includes the core highlight features, while Readwise Gold ($5/month) unlocks premium tools like tags, flashcards, analytics, and full-text search.
The daily and weekly digest emails are perfect for delivering your highlights on a schedule to reinforce learning. If you read ebooks extensively, give Readwise a try!
Platforms: iOS, Android, Web, Kindle
Price: Free or $5/month (Gold)
4. Highlight & Note – Simple Android Highlighter
For Android users who want a simple free highlighter, check out Highlight & Note. Once installed, any text you highlight can be copied over to the app to add notes.
Despite lacking advanced features, Highlight & Note provides a handy basic highlighter integrated nicely within Android. You can easily switch to it from the copy/paste menu after highlighting text in any app.
If you only need quick on-the-go highlighting on an Android device, Highlight & Note is a great choice. But power users may want a more robust app.
Platform: Android
Price: Free
5. Highlighter for Safari – Best for iPhone Web Use
On iPhone and iPad, Highlighter for Safari is a super convenient free highlighter that works directly within the Safari browser.
You can highlight, underline, and add notes to any webpages right in Safari without switching between apps. Your highlighted pages sync between devices too.
For casual web highlighting on an iPhone, it doesn’t get much easier than Highlighter for Safari! However, the toolset is fairly limited, so serious studiers may prefer an app with more features.
Platform: iOS
Price: Free
6. Highlighted – Best for Collecting Book Passages
Calling all bookworms! Highlighted is tailored specifically for helping you collect and organize your favorite book quotes and passages.
The app makes it easy to highlight excerpts from physical books with your device‘s camera. It also lets you share memorable quotes on social media straight from your digital commonplace book.
For avid readers and literature students, Highlighted is the perfect way to create your own personal treasure trove of book wisdom!
Platform: iOS
Price: Free
7. Highlights – Best for Annotating PDFs
When you need to intensely study and annotate research papers, Highlights is a great option focused specifically on academic PDF use.
The app allows you to highlight, make notes, bookmark pages, fill out forms, sign documents and more. It even uses AI to extract tables and charts into formatted Excel data. Impressive!
While Highlights is primarily designed for academic papers, the pro features and polished interface make it a robust PDF annotator for users of any level.
Platforms: iOS, Mac
Price: Free or $4.99/month (Pro)
8. PDF Highlighter – Best for PDF Markup on iPhone
Lastly, if you use an iPhone and work extensively with PDF documents, PDF Highlighter lives up to its name with excellent PDF markup abilities.
The app allows you to highlight, underline, draw, add text, and more to any imported PDF or image file. Your edited files can be saved, exported, and shared as high quality PDFs or images.
For iPhone users who need to frequently annotate and edit PDFs locally, PDF Highlighter is one of the top choices available.
Platform: iOS
Price: Free
5 Tips for Using Highlighter Apps Effectively
Based on my personal experience using various highlighter apps over the years, here are 5 pro tips to help you get the most value and productivity from them:
1. Use a Consistent Color Code System
Pick a color coding scheme that works for you – like yellow for key points, green for definitions, blue for questions, etc. Maintaining a consistent system makes reviewing quicker.
2. Highlight Sparingly
Don‘t go highlight crazy! Only highlight the truly critical 20% of content to emphasize key sections. Avoid huge blocks of highlighted text.
3. Add Notes and Comments
Include notes and comments to summarize sections or elaborate on concepts for deeper learning.
4. Organize and Tag Highlights
Proper sorting with tags, notebooks, and folders helps you quickly locate highlights later when reviewing.
5. Export and Archive Old Highlights
Regularly export then archive old highlights you no longer need quick access to so your list stays clean and relevant.
Are Highlighter Apps Worth It?
In summary – absolutely! For students, highlighter apps help boost retention and grades by facilitating active learning. Professionals save time accessing key information from documents. And readers enjoy collecting their favorite book passages.
The top highlighter apps provide a much smoother digital experience than paper highlighting. And with cross-device syncing, you always have your annotations handy wherever you go.
So give one of these excellent highlighter apps a try to level up your reading, studying, and productivity! Feel free to reach out if you have any other questions.
