Best PDF Annotation Apps

Best PDF Annotation Apps

PDF annotation app allows you to highlight PDF, add notes to PDF files, and underline your PDF files. Using these apps, you will be able to add various forms of annotations to your PDFs. The PDF markup app allows you to add annotations to your PDFs with stamps, notes, strikeouts, comments, highlights, and more.

Annotating a PDF - marking important passages, highlighting special words, writing notes in the margins is a good way to tarnish it forever. Fortunately, annotations aren't so destructive when reading digitally or on the web. The right kinds of annotations in the right place can help you remember more and be more productive. On the web, annotations are also valuable when you're collaborating on documents with a team. 

PDF annotation apps allows you to highlight PDF, add notes to PDF files, and underline your PDF files. Here will be a top list of PDF annotation apps.

1. Markup

Markup - 4 star rating

(Android, iOS, Mac)

Markup is a productivity tool for reading and annotating web pages and PDFs on your phone (or iPad or iPod Touch). Designed for personal use or team collaborations, Markup uses artificial intelligence, web highlighting, and more to make it easier to take in massive amounts of information in a short amount of time.

Using the AI-powered auto summary tool, you can automatically summarize heavyweight content and extract the information that matters most in a single click. The web highlighter allows you to highlight text and excerpts on web pages, sync the highlights across your devices, explore other highlights from the Markup community, or even share your own. You can also annotate documents as you read them with text boxes, arrows, shapes, freehand writing, or sticky notes, and display them all in a summary PDF.

Devices: iOS, Chrome, Web Browser

Price: Free with in-app purchases

If we missed any of the Best PDF Annotation Apps, tell us about them!

PDF Reader Pro

2. PDF Reader Pro

PDF Reader Pro - 5 star rating

(Android, iPhone, iPad)

PDF Reader is a free PDF annotation app for iOS and Android to read, annotate, edit, fill forms, sign, convert, Watermark, Create, OCR and more to maximize your document productivity. PDF Reader provides you with wide selection of annotating tools such as highlight, underline, strikethough. It also enables you combine,crope,rename and move PDF files on your Android devices.PDF reader supports over 50 languages.

PDF Reader allows you to perform annotation. Key features within the PDF reader includes fill PDF forms out with interactive field texts, night mode for long time reading and watermark stamps such as Approved, Not Approved, confidential and conversion formats such as PDF, JPG and PNG. With the help of PDF Reader, you can easily annotate documents and read files with few taps on your mobile screen.

Devices: iOS, Android

Price: Free


3. LightPDF

LightPDF - 5 star rating

(Android, iPhone, iPad Windows)

LightPDF is a free PDF reader which is designed to provide people an easy way to work with their PDF documents. It includes many daily used PDF tools with a clean and easily understood interface, The website allows people to convert PDF to Office formats (Word, PPT, Excel), TXT and image formats (JPG & PNG), convert Word, PPT, Excel, JPG, PNG, CAD to PDF. Other tools like editing, OCR, compressing, protecting, unlocking, signing, adding watermark, adding highlights, splitting, combing, rotating PDF are also supported by LightPDF.

Moreover, in order to help more people and organizations to improve productivity and create value, LightPDF also provides API services for PDF converting and OCR. So other website or app developers could also embed our API services to help their customers stay productive.

Devices: iOS, Android, Windows

Price: Free with in-app purchases

Flexcil 2 Note & PDF Reader

4. Flexcil 2 Note & PDF Reader

Flexcil 2 Note & PDF Reader - 5 star rating

(Android, iPhone, iPad)

Flexcil 2 is primarily used as a PDF reader. Flexcil provides the most efficient way to read PDF, annotate PDF, and take notes. Combining these functions allows you to view the PDF while dragging elements from it to your notes at the same time and organizing them easily.

By combining PDF reader and digital note, you can view the PDF while dragging elements from it to your notes at the same time and organize them easily. If you are looking for an app that allows you to do in-depth PDF annotation and allows you to do professional literature research, then you should look at Flexcil. You can connect with various cloud storage services, including Dropbox, OneDrive, and Google Drive.

Devices: iOS, Android

Price: Free

Adobe Acrobat Reader

5. Adobe Acrobat Reader

Adobe Acrobat Reader - 5 star rating

(Android, iPhone, iPad)

Adobe Reader is a popular PDF annotation app that allows you to annotate or sign your documents with the ultimate PDF manager and known to some as the best pdf reader on the market. Adobe Acrobat Reader have introduced annotation and commenting features for marking up your PDF documents. The annotations and comments you’re going to save on your PDF can then be open and edited on your devices. 

Adobe’s free PDF reader is great for any parent or teacher who needs to annotate PDFs on the go or on their commute. With the Acrobat Reader mobile pdf learning app, you can highlight text, add sticky notes, mark up documents, review documents, and collaborate with others in those documents — all from your phone or tablet. This tool has three viewing modes and also allows you to leave comments on your PDFs using drawing tools, and markup and highlight text with markup app.

It also connects to Adobe Document Cloud and other cloud storage systems like Dropbox, Google Drive, Microsoft OneDrive. By simply clicking the “share” button, you can send items for review to all the people who need to see it, set a deadline for feedback, customize the accompanying message, and even set reminders for people to complete their reviews.

Devices: iOS, Android

Price: Free

iAnnotate PDF

6. iAnnotate PDF

iAnnotate PDF - 4 star rating

(iPhone, iPad)

iAnnotate PDF is one of the best app for annotating PDF files. It makes a perfect balance between providing sufficient tools yet not sacrificing on the UI. iAnnotate PDF's interface gives you the desktop PC feel while at the same time allowing you to use android's touch screen functionality. It consists of the typical annotation tools such as: Pen, Highlighter, Underline.

iAnnotate is the top choice to read and annotate for iPhone, iPad and iPad Pro. Parents and Teachers can work on as many documents as they want to with unlimited tabs. Their powerful new plus button simplifies importing documents to your library.

Two Document View enables you to multitask intelligently. All markups on your documents can be saved directly, letting you view markups in external PDF readers. Utilize all of the same features used to markup and manage your documents in regular view, to work simultaneously. iAnnotate also offers image sharing. We still convert them to PDF, but give you the option to share back out as an image with your annotations flattened. 

Devices: iOS, Android

Price: Free

Annotable: Annotation & Markup

7. Annotable: Annotation & Markup

(iPhone, iPad)

Annotable is one of the best PDF markup apps available with all the basic features of annotation. This app has comprehensive features and an intuitive interface that is efficient for markup and sharing of files on your iOS device. 

Annotable is a reliable PDF markup app for reading, editing, and annotating PDF files from Android devices. This PDF markup app can help you to read comfortably, ad-free, and free of charge on Android devices, it not only online but also without connecting to the Internet.

Devices: iOS

Price: Free with in-app purchases

Foxit PDF Editor

8. Foxit PDF Editor

(Android, iPhone, iPad)

Foxit Reader is an easy-to-use PDF reader app that allows the users to view, annotate and protect PDF. Foxit PDF Reader allows you to create PDF from common file formats like Word, PowerPoint and Excel and viewed by some as the best pdf reader.

ConnectedPDF is leading edge technology that powers cloud-based services for PDF files, services includes Security, Document Management and Collaboration. 

Educators can experience high-quality PDF rendering as well as the dual-page view which is a really handy tool. Not only can you edit PDFs but you can even play audio clips and view videos. Users will be able to sign documents in their own handwriting or utilize eSignature.

Devices: iOS, Android

Price: Free

These are still the best apps for PDF markup and annotation on your iOS or Android devices.

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