List of the Top 15 PDF Annotators for Android in 2026

Apryse (formerly PDFTron) transforms how organizations manage documents. Built for both server and web applications, Apryse empowers businesses and developers to securely handle the entire document lifecycle — from creation and collaboration to compliance and archiving — without relying on third‑party services. With Apryse, you can: Run at enterprise scale on your own infrastructure, ensuring privacy, compliance, and maximum control. Deliver modern, in‑browser document experiences with fast, accessible viewing, editing, and collaboration tools. Integrate seamlessly across platforms, supporting PDF, Microsoft Office, CAD, and many other file types. Streamline workflows and reduce costs with technology trusted by leading enterprises worldwide. Apryse makes document workflows smarter, faster, and more secure — so teams can focus less on manual processes and more on meaningful work.

Nutrient offers a comprehensive suite of solutions tailored to meet all your PDF needs, providing tools that effortlessly handle PDF functionalities on any platform. 1. SDK: Integrate sophisticated PDF capabilities into iOS, Android, Windows, the web, or any cross-platform technology, offering features such as PDF viewing, annotation, collaboration, and much more. 2. Libraries: Use our robust .NET and Java libraries to empower your backend systems with capabilities for batch processing of redactions and PDF forms, OCR for scanned text, and editing of PDF documents, all directly from your application server. 3. Processor: Our nimble PDF microservice, Processor, facilitates the quick creation of PDFs from HTML, including HTML forms, alongside conversions from Office to PDF, OCR processing, redaction, and the combination and exporting of XFDF. 4. PDF API: Leverage our hosted PDF API to create, convert, and modify PDF documents within your workflows. We manage the development and server operations, allowing you to focus solely on growing your business. At Nutrient, we see ourselves not merely as a tool but as a dedicated partner in your journey to success. You can easily reach out to our engineers for specialized support, access thorough examples to aid in integration, and utilize our premium documentation to maximize your experience. Additionally, we are committed to continuous improvement and innovation, ensuring our solutions evolve with your needs.

MobiPDF, previously known as PDF Extra, serves as a user-friendly platform for reading and editing PDFs, offering features such as creating, organizing, annotating, filling, signing, converting, and sharing any PDF file. This versatile tool stands out as a cost-effective substitute for Adobe Acrobat Pro, catering to a wide array of user needs. HERE’S WHAT YOU CAN EXPECT WITH MOBIPDF: Multiple Viewing Options: Utilize a focused "Read Mode" for an uninterrupted reading experience. Sophisticated Editing Capabilities: Engage with a PDF editing interface reminiscent of Word. Bidirectional Conversions: Effortlessly transform PDFs into and from formats like Word, Excel, PowerPoint, or images. OCR Integration: Enhance scanned documents by making them searchable. Annotation Features: Utilize tools to highlight, comment, strikethrough, stamp, and more to improve your documents. Simple PDF Management: Easily reorder, compress, split, and merge PDFs as you need. Signing and Security: Incorporate signatures, create and fill out forms, and safeguard your PDFs with passwords, encryption, and digital certificates. Offline Functionality: Continue working on your files without needing an internet connection. Instant Translation: Translate any PDF into over 50 languages with just a click. Overall, MobiPDF combines essential features and user-friendly design, making it a reliable choice for anyone needing comprehensive PDF tools.

Enhance your productivity with user-friendly PDF tools designed to streamline your workflow with PDF documents. These tools are completely free and straightforward to utilize! You can easily incorporate text, images, and freehand drawings into your PDFs, fill out forms, and even create a personalized signature for signing documents. Moreover, share your PDF files with confidence through a secure link that expires automatically, ensuring complete privacy with zero-knowledge end-to-end encryption using 256-bit AES technology. This way, your sensitive information remains protected while you collaborate!

The widely recognized SDK supports platforms including Android, iOS, and Windows UWP, and was created by our team in 2012, initially serving as a development tool for these operating systems. Since its inception, we have continually enhanced its capabilities. RadaeePDF Classic provides fully customizable frameworks in Java, Objective C, and C#, along with simplified plugins for Cordova (Android) and Xamarin (iOS). More than 6000 small and medium-sized businesses, as well as large corporations, utilize the RadaeePDF Classic SDK across over 8500 applications. It boasts features such as PDF reading, various rendering formats, support for annotations, text search, and extraction, among others. Additionally, the Master Edition represents a major upgrade from the Classic version, offering robust functionalities like full manipulation of form fields, PDF optimization, import/export of XFDF, and handling of signatures and certificates. Furthermore, it maintains advanced features such as diverse rendering layouts, comprehensive support for annotations, and enhanced text search and extraction capabilities, making it an invaluable tool for developers.

Drawboard PDF - Robust PDF capabilities. Experience the most user-friendly PDF editing and annotation application available for Windows, iOS, macOS, Android, and the web. Drawboard PDF – Essential features available for free! Effortlessly mark up and edit any PDF as if you were using pen and paper. PDF ANNOTATION TOOLS THAT ENABLE YOU TO ACHIEVE GREAT THINGS. DRAW Access a full suite of inking tools designed for marking up documents and collaborating with a natural feel reminiscent of writing with a pen. INSERT Add whatever you require; including text, notes, callouts, signatures, images, audio notes, and much more. MEASURE Utilize measurement tools tailored for technical professionals in fields like Architecture, Construction, and Manufacturing. Obtain precise measurements of elements on the page with straightforward calibration. ORGANIZE Keep all your documents conveniently stored in one location, whether on your device or in the cloud. Effortlessly merge, split, compress, and rearrange PDFs as you wish. CROSS-PLATFORM Seamlessly work from any location on any device, collaborating in real-time! COLLABORATE Engage in instant collaboration directly on the document. Conduct your work where it’s actually needed. Invite team members to collaborate on your canvas and share your documents through Drawboard Cloud – a new haven for PDFs. With a design that aims to replace traditional pen and paper, this application offers a comprehensive set of tools and an intuitive interface, making the transition to a paperless environment a straightforward choice for everyone. Embrace the future of document management today!

PDF Reader Pro stands out as a comprehensive PDF solution that caters to all your document management needs. It boasts an impressive array of features, including reading, annotating, editing, optical character recognition (OCR), signing, creating and filling out PDF forms, bookmarking, outlining, text-to-speech (TTS), managing tables, and converting PDF files, making it versatile for any device. Whether you are crafting a PDF on an iPhone or signing a document on your Android phone, PDF Reader Pro ensures that all tasks can be accomplished with ease and efficiency. In addition to these core functionalities, it offers a variety of supplementary features such as presentation tools, linking options, stamping, compression, security measures, background customization, header and footer insertion, Bates numbering, text searching, text box support, Touch Bar compatibility, annotation export, and multiple conversion capabilities. Moreover, it serves as the premier PDF to Office converter, allowing users to export from PDF to numerous formats including Microsoft Word (.docx), PowerPoint (.pptx), Excel (.xlsx), RTF, HTML, text, images, CSV, and more, all without the need for an internet connection. PDF Reader Pro also provides the ability to convert PDFs into various image formats such as JPG, PNG, BMP, GIF, TIFF, TGA, and JP2, ensuring that you have all the tools you need for your PDF tasks at your fingertips.

KDAN PDF is a versatile and intelligent PDF solution designed to optimize the digital workflows of independent professionals and specialized industries. In a world where document management is central to success, KDAN PDF provides the tools necessary to edit, secure, and analyze files with precision across Windows, Mac, and mobile devices. The platform stands out by integrating document intelligence that allows professionals to interact with their PDF content. Through the AI assistant, users can generate summaries of lengthy reports, ask specific questions about file data, and extract tables directly into editable spreadsheets. This intelligent approach minimizes administrative overhead and allows users to focus on high-value tasks. Key features of KDAN PDF include: - Professional Editing and OCR: Seamlessly update text and images or use multi-language OCR to digitize paper archives. - Synchronized Workflow: Maintain continuity across iOS, Android, and desktop environments with a unified user interface. - Advanced Security: Protect sensitive information with permanent redaction, encryption, and digital signatures. - Flexible Organization: Manage documents efficiently using Bates numbering, page rearrangement, and high-fidelity file conversion. Optimized for fields like healthcare, legal services, and academia, KDAN PDF ensures that your professional documentation is handled with the highest level of integrity and efficiency. By providing an offline-first experience, it guarantees that your most sensitive data remains secure while you work across any screen.

UPDF provides a comprehensive solution for editing, annotating, and managing PDF files across platforms like Windows, Mac, iOS, and Android. This versatile application consolidates all essential tools into a single user-friendly interface, designed to cater to the preferences of both novice and experienced users who appreciate an aesthetically pleasing layout. Among its key features, UPDF allows users to edit PDF documents by adding, deleting, and modifying text properties, including font style, color, and size, while also enabling image manipulation such as cropping, rotating, and extracting. Additionally, users can annotate PDFs by highlighting, underlining, or striking through text, and can easily insert shapes, sticky notes, and text boxes for improved communication. Another significant feature is the ability to manage PDF pages, which includes options to rotate, delete, and extract specific pages as needed. Furthermore, UPDF enhances the reading experience by offering various viewing modes, including both single-page and double-page formats, ensuring flexibility for all types of users. With such a robust set of functionalities, UPDF stands out as an invaluable tool for anyone working with PDF documents.

Enhance your applications with the versatile MuPDF SDK, which seamlessly integrates robust PDF capabilities. This compact yet swift viewer accommodates various document formats, including PDF, XPS, OpenXPS, CBZ, and ePUB. It features a renderer crafted for high-quality anti-aliased graphics, ensuring that text is displayed with precise metrics and spacing, accurate to mere fractions of a pixel. The PDF library comes equipped with a range of interactive functionalities such as annotations, form filling, digital signatures, redactions, and search capabilities. Furthermore, the command-line tools offer extensive customization options for rendering, converting documents, and manipulating PDF files, allowing for conversion to formats like HTML, SVG, and CBZ. In addition to its C library, MuPDF provides a Java library utilizing JNI, compatible with both Oracle's Java and Android platforms. Alongside the Java API, bindings for C++ and Python have also been established, showcasing its compatibility with major programming environments and operating systems. Its flexibility and optimization for various platforms make it a powerful tool for developers. The MuPDF API has found applications in a wide range of deployments, including mobile applications on both Android and iOS, SaaS and cloud solutions, document management systems, and various embedded products, highlighting its versatility and effectiveness in meeting diverse user needs.

Xodo provides the capability to edit, annotate, and sign PDF documents seamlessly across desktop, mobile, or web platforms. This user-friendly tool simplifies PDF management, eliminating the hassles of printing or faxing altogether. Now, you can easily sign important documents like contracts, expense reports, and cover letters directly on your smartphone or tablet, using just your finger or a stylus. The process is incredibly straightforward! With Xodo, signing any document requires merely a tap, freeing you from the hassle of searching for a pen or dealing with messy ink. You can also conveniently save your signature for future use, allowing you to sign documents with just a single tap or mouse click. Once you're done, saving and sharing the file with others is a breeze, significantly reducing the time spent in email exchanges. Xodo effectively alleviates the stress associated with completing forms. Using your smartphone or tablet, you can fill out forms from virtually anywhere by simply tapping on the screen and selecting checkboxes. This innovative approach allows you to save both time and effort, making it easier than ever to fill out and share forms on the go. With Xodo, managing your paperwork has never been more efficient or hassle-free!

Conholdate.Total serves as the all-encompassing toolkit for every .NET API provided by Aspose and GroupDocs, empowering developers to execute an extensive range of document processing functions within their .NET applications. This comprehensive package offers integrated solutions tailored for various document management systems, enabling users to create, modify, print, view, sign, compare, automate, and convert a diverse array of widely-used document formats. With Conholdate.NET, you can seamlessly handle numerous file types, making it simple to open, edit, and convert files with ease. Currently, Conholdate.Total.NET is compatible with an impressive array of file formats, which includes Microsoft Word documents, Excel spreadsheets, PowerPoint presentations, Adobe PDF files, Outlook items, Microsoft Project files, and over 100 additional formats, making it an invaluable resource for developers. Its versatility ensures that users have the tools necessary to manage their document workflows effectively.

LightPDF is an all-in-one PDF platform designed for users of all levels. Its intuitive interface allows effortless reading, editing, conversion, and management of PDF files. 【Key Features】 • Editing & Page Management: Add text, annotate, insert links, headers or footers, delete, rotate, split, merge, extract, or replace pages. • Conversion Tools: Convert PDFs to Word, Excel, PPT, TXT, JPG, and more; convert other formats to PDF. • AI & Automation: Generate PDFs from prompts, create mind maps, convert prompts to editable PPT slides, translate PDFs, and automate multiple PDF tasks with the AI Agent. • Watermark & Image Processing: Remove PDF or image watermarks, stickers, logos, and text, with manual or automatic modes. • OCR & Image Conversion: Extract text from images, including JPG to Word or Image to TXT, and convert image formats like HEIC, PNG, WebP, and JPG. • Security & Optimization: Add passwords, compress PDFs, optimize documents, and enhance usability for work, study, or collaboration. LightPDF empowers users to handle all PDF and image tasks efficiently in one platform, combining intelligent automation with comprehensive document tools.

The PDF Converter application enables users to swiftly transform any file on their iPad into a PDF document. It allows for easy access and downloading of files from emails, cloud storage, or the internet directly on the device, quickly converting them into visually appealing PDFs. This app is specifically tailored for its purpose and excels in delivering high-quality results. Whether you’re dealing with a multi-million dollar contract or a simple webpage, you can save it as a PDF in mere seconds. The PDF Converter is adept at generating high-quality PDFs from a diverse range of file types, including email attachments, iWork and MS Office documents, images, web pages, and more. Once your PDF is created, you can leverage the powerful features of PDF Expert to view, annotate, edit, or merge your documents effortlessly. The accuracy of the conversion process ensures that the original content is preserved perfectly, giving users complete control over the entire experience. Moreover, the app guarantees total security by performing all conversions locally on the iPad, eliminating the need for an internet connection and ensuring that your files remain confidential. This feature also enhances convenience for users who may not always have internet access, allowing them to work efficiently at any time. Ultimately, the PDF Converter app stands out as an essential tool for anyone looking to streamline their document management on the go.

This toolkit for processing and cleaning documents and images empowers developers to seamlessly incorporate various document handling features, such as image editing, compression, and enhancement, into their software. With ImageGear, applications can efficiently perform tasks like deskewing and removing lines and speckles from files, ensuring that images are clear and professional. The advanced color-processing capabilities of ImageGear enhance image quality while also minimizing the size of compressed files. This software development kit (SDK) offers a wealth of APIs designed for thorough image processing and cleanup, making it easier than ever to enhance application functionality. Additionally, ImageGear is instrumental in fulfilling all aspects of the document lifecycle, allowing .NET developers to integrate strong PDF features into their applications. Users can not only view and annotate PDF pages but also compress them to improve efficiency. Explore the extensive PDF manipulation features provided by ImageGear to elevate the performance and functionality of your applications even further.