Best Free PDF Annotators of 2025

Global OEMs, SaaS and enterprise end-users rely on Adobe PDF Library to automate the creation, editing and management of PDFs. An Adobe partner, our SDK uses the same source code as Acrobat for stability, reliability and quality results. Languages: .NET, .NET Framework, Java and C/C++ Platforms: Windows, Linux & MacOS Package managers: NuGet & Maven Capabilities include but are not limited to: -Annotations -Content creation -Content modification -Color management -Extraction - text, images, forms -Compression/optimize -Conversion - PDF/A, PDF/X, EPS, PostScript, XPS, ZUGFeRD, color -Display, Printing -Extract text, images & other content -Forms - Import, export, flatten static & dynamic XFA forms, AcroForms -Images - extract, import/export, thumbnails, render/rasterize pages, separations -Optimization - size, content, images, etc. -OCR - add text to document, add text to image -PDF to Office Documents (Word, Excel, PPT) -Security - Viewer settings, redactions, password, encrypt/decryption, watermark Pricing options for OEMs, SaaS & end-users are flexible and based on usage. Shorten development times & get to market faster with Adobe PDF Library. Free trial - download today.

MobiPDF (formerly PDF Extra) is an intuitive reader and editor that allows you to read, edit, create, OCR, organize, annotate, fill and sign, convert, and share any PDF. This makes MobiPDF an excellent choice for users seeking a budget-friendly alternative to Adobe Acrobat Pro. HERE’S WHAT YOU GET WITH MOBIPDF: Multiple Page View Modes: Enjoy a distraction-free "Read Mode". Advanced Editing Tools: Experience a Word-like PDF editing environment. Two-Way Conversions: Convert PDFs to and from Word, Excel, PowerPoint, or image formats. OCR Support: Make scanned documents searchable. Markup Tools: Highlight, comment, strikethrough, stamp, and more to enhance your documents. Effortless PDF Organizer: Reorder, compress, split, and combine PDFs with ease. Sign & Secure: Add signatures, create and fill forms, and protect your PDFs with passwords, encryption, and digital certificates. Offline Mode: Work freely on your projects, even offline. Seamless translation: One-click translate any PDF into 50+ languages.

SwifDoo PDF is an All-in-One PDF Maker, Reader, Editor and Converter for Windows SwifDoo PDF enables users to create, convert, merge, compress and sign PDF documents with minimum effort. The intuitive design tool also enables you to insert links or images to PDFs. The PDF document can be converted to Microsoft Word, Excel, PowerPoint, JPG, PNG, TIFF, BMP, and vice versa. You can also convert CAD to PDF. The PDF compression module integrated with SwifDoo PDF is optimized for file size without quality loss. SwifDoo PDF has a number of special features for scanning copy convert. Besides many convert features. PDF Reader PDF Annotation (Including Stamp) Picture/image Extraction (only need copy and paste from PDF) PDF Edit PDF Compress PDF Merge PDF Split PDF Signature System Requirements: Windows 10/7/8/vista/XP Edition: SwifDoo PDF 2.0.1.9

PDF Tools for you to be more productive with PDF documents. Free and easy to use! Add text, images, freehand annotations to PDF. Fill forms. Create your own signature and sign document. Send PDF files safely and securely with a link that automatically expires, zero-knowledge end-to-end encryption with 256-bit AES.

PDF Studio Viewer is a multi platform document reader that is dependable and very simple to operate. PDF Studio Viewer has the ability to annotate documents and fill documents that are interactive. To experience an upgraded version of this product, you can check out PDF Studio Standard and PDF Studio Pro. Features included in PDF Studio Viewer: -Display PDFs with high fidelity -Annotate & Markup PDFs -Fill & Save Forms -Render Digital Signatures & Layers -Advanced User Interface -Advanced Print & Search Options -Document Storage Integrations -DocuSign© Integration

Utilize our free Adobe Acrobat Reader to view, sign, collaborate on, and annotate your PDF documents effortlessly. With Adobe Acrobat Reader, you have the unique ability to view, sign, gather feedback, and share PDFs at no cost. For those looking to expand their capabilities, subscribing to Acrobat Pro allows you to edit, export, and send PDFs for signature requests. Go beyond merely opening and viewing PDF files; it’s simple to annotate documents and compile feedback from various reviewers into a single shared online PDF. You can conveniently work on your documents from anywhere by using the Acrobat Reader mobile app, which is equipped with all the necessary tools for converting, editing, and signing PDFs. Additionally, the app enables you to utilize your device's camera to capture documents, whiteboards, or receipts and convert them into PDFs. By connecting to Adobe Document Cloud, Acrobat Reader ensures that your PDF work is accessible from any location, and you can effortlessly access and store your files in services like Box, Dropbox, Google Drive, or Microsoft OneDrive. This seamless integration allows for a versatile and productive workflow, making document management easier than ever before.

Drawboard PDF - Powerful PDF tools. Most intuitive PDF editing and markup app for Windows, iOS, macOS, android and web. Drawboard PDF – All the essentials free! Mark up and edit any PDF with the ease of pen and paper. PDF MARKUP TOOLS TO HELP YOU WORK WONDERS. DRAW All the inking tools you need to markup and collaborate with the feel of pen and paper. INSERT Insert anything you need; text, notes, callouts, signatures, images, audio notes, and more. MEASURE Measurement tools for technical teams in Architecture, Construction Manufacturing and more. Get accurate measurements of elements on-page with easy calibration. ORGANIZE Keep all your docs in one place, local and cloud. Merge, split, compress and rearrange PDFs with ease. CROSS-PLATFORM Work from anywhere on any device, in real-time! COLLABORATE Instant collaboration right on the page. Do work where work is done. Invite team members to your canvas. Share your doc using the Drawboard Cloud – a new home for PDFs. Designed to replace pen and paper with an extensive array of tools and an intuitive interface to make going paperless the easier choice.

KDAN PDF Reader is your all-in-one PDF solution. Edit, sign, OCR scan, convert, annotate, and fill forms in PDF documents. With innovative AI features, speed up your document workflow! Designed for Mac, iPhone, and iPad, KDAN PDF Reader is trusted by millions for its comprehensive features and efficiency. KEY FEATURES EDIT TEXT & PDF • Fix errors and typos directly in PDF - replace, add, or delete text in PDFs • Add, edit, crop, and adjust images in PDFs • Add header & footer • Add Bates numbering for easy reference, tracking, and organization • Use stamps or dynamic stamps to indicate status, provide feedback, and highlight information in a document CONVERT PDF • Offline file converter - convert file without an internet connection • Convert PDF to Office file formats, image, or ePub • Format supported- docx, xlsx, csv, pptx, rtf, txt, html, jpg, png, BMP, jpg200, pub, MOBI SIGN & FORMS • Fill & edit forms • Create fillable forms with buttons, checkboxes, and list boxes • Create signature and sign on PDF • Create signatures using trackpad, keyboard, or images EDIT PAGE • Merge & split PDFs • Extract, rearrange, rotate, delete, and crop PDF pages • Change PDF background color • Append pages from

UPDF allows you to edit, annotate, and manage PDF on Windows, Mac, iOS, Android, and Android. All the tools you need to organize, edit, annotate and manage your PDF files are available in one smart, all-rounder smart app. It was specifically designed to satisfy the needs of most users who want a beautiful yet easy-to-understand interface that is not only for beginners. Key Features 1. Edit PDF Document You can add, delete, and edit text properties and formats, such as font style, font color and size. You can also crop and rotate, replace, remove, or extract images. 2. Annotate PDF - Highlight, underline, or strike out any parts. For a faster and easier way to add text, you can also add shapes, sticky note and text boxes. 3. PDF Page Management Rotate, delete and extract PDF pages. 4. Navigate and View PDF Files - Flexible reading mode, such as single-page mode or double-page mode.

Systweak PDF Editor provides a variety of features and tools for editing and managing PDF documents. With these capabilities, users can redact text, perform OCR on PDFs, sign documents, split files, compress them, convert multiple files at once, lock or unlock PDFs, and make various other modifications. This makes it a versatile solution for anyone needing to handle PDFs efficiently.

TinyWow offers a variety of free online tools for conversion and PDF handling, designed to assist users with a wide range of challenges. To ensure privacy, all files, whether processed or not, are removed from the server within an hour. Users can easily transform PDF files into JPG images, allowing them to download each individual page as a separate image file. Similarly, it is also possible to convert PDF documents into PNG format, with each page available for download as an image as well. This makes TinyWow a versatile option for anyone needing quick and efficient file conversions.

You can convert, create, edit OCR, compare, sign, and even OCR PDFs. You can customize the interface language and its appearance, from light to dark themes, to make it easier to work with PDFs. You can customize your conversions by choosing a page, paragraph, or a single line to convert. Convert complex PDF table data to Microsoft Excel using a custom PDF to Excel converter. Smart Layout Detector allows you to keep the table styles intact. Edit PDF text and pages. Annotate and remove PDF content. Sign PDF documents. Fill, edit, and create PDF forms. Split documents into multiple parts. Convert scanned PDFs into English, French and Spanish. Batch PDF conversion can be automated by storing large numbers of PDF files in queues and even entire directories. Batch create PDFs from a variety of formats and merge them all into one file. Add passwords and file permissions to create secure PDFs from existing pages or blank pages. Able2Extract Professional: Your Swiss Army Knife to create PDF files.

PDFgear is a PDF solution that allows users to view, edit, convert, sign annotate, organize and more on Windows, MacOS and iOS. PDFgear's clean and simple interface allows users to enjoy reading and editing documents without interruption. PDFgear Copilot is a personal assistant that offers more options than a standard document assistant. It's powered by AI so users can easily manipulate all the PDFgear features and chat with PDFs. You're lost in the vast array of functions and document content? Don't worry! Ask Copilot! You can ask Copilot anything! Processing PDFs is as easy as a stroll in the garden with PDFgear.

You can copy and paste PDF text, annotate PDFs and fill out interactive PDF forms. With a lightweight and completely free Slim PDF Reader, you can also validate digital signatures that you have received on Windows, Mac, or Linux. It has a Dark theme that will save you battery and reduce eye strain. Slim PDF Reader is a desktop PDF reader that is small and lightweight (download size 15 MB), fast and easy to use system resources, and 100% free of bloatware.

Simple yet powerful, SignFlow transforms the way you interact with PDFs by making reading, annotating, editing, signing, organizing, and filling out secure documents a breeze! Equipped with a comprehensive suite of essential PDF tools, SignFlow stands as your ultimate companion for managing PDF files. With SignFlow, you can seamlessly add legally-binding digital signatures to your documents while enjoying a user-friendly solution for creating, editing, and completing PDF forms. The platform allows for easy text editing within PDFs akin to word processing, enabling you to manage and modify PDF pages with ease, as well as annotate and view your files effortlessly. Experience various reading modes, including Full-Screen, Single Page, Read Mode, Split View, and Multi-tab for maximum convenience. You can navigate smoothly through pages and effortlessly toggle between day mode, night mode, and a special eye-protection mode for those long reading sessions. Make your notes stand out! Utilize highlighting, underlining, and strikethrough options to emphasize important texts in your PDF documents. Choose from a palette of colors to draw attention to different pieces of information. Additionally, enhance your PDFs with standard business stamps such as APPROVED, along with digital, dynamic, and customizable text/image stamps for a professional touch. Whether for work or personal use, SignFlow is designed to enrich your PDF experience and streamline your workflow.

Xodo allows you to edit, annotate and sign PDFs on your desktop, mobile, or web. Xodo makes it easy to work with PDFs. No more printing or faxing! You can sign contracts, expense reports and cover letters on your smartphone or tablet with just your finger or stylus. It's that easy! Sign any document with just your finger, instead of searching for a pen or printing ink. You can save your signature and sign any future documents with just one tap or click of the mouse. Save the file and share it with anyone who needs it. It takes only seconds to do what used to take many emails back and forth. Xodo takes stress out of filling out forms. You can complete forms from your smartphone or tablet anywhere you are by simply tapping on the screen to fill in fields and selecting checkboxes. You can save time and energy. Fill out forms on your smartphone or tablet and save them to share with anyone who needs them.

Wondershare HiPDF is an AI-powered online PDF solution that offers a wide range of features such as chatting with PDF, AI reading, editing, converting, OCR, signing and managing PDF documents. It also provides many image tools. HiPDF is easy to use and has a free plan. It allows users to easily summarize, explain, rewrite, merge, split, compress, convert, rotate, unlock, and protect PDF files with just a few clicks. As a member of the PDF Association and having received internationally recognized certifications such as ISO 27001 and SSI SECURE, HiPDF ensures both simplicity and security in editing PDFs, having processed millions of files cumulatively. Top Features: AI read: Summarize, rewrite, explain and chat with PDFs with the AI PDF reading assistant. Convert PDF: Convert PDF documents to and from any Microsoft Office format or image. Merge PDF: Combine PDF files online. Compress PDF: Reduce the size of your PDFs online easily. Sign PDF: Quickly and securely fill and sign PDFs from any device, anytime, anywhere. Protect PDF: Protect PDF from copying, editing, printing and viewing with passwords. Keep sensitive data confidential.

CoolNew PDF is a software with many features to manage PDF documents. Editing, converting, splitting, combining, annotating, and protecting your files is a taste of what the app can do, but it doesn't stop there. The program comes with a flashy interface, but it is intuitive and easy to navigate. Using the ribbon, you can sift through the categories of available functions. Each ribbon entry comes with its own toolbar containing functionality specific to its description.  CoolNew PDF can export most Office documents to and from PDF. The same rule also applies to images. Merging, splitting, and extracting pages and images are the most basic features a PDF manager can have, but they are essential. In addition, it is possible to apply watermarks and encrypt files easily, when protection is needed, and an OCR tool can help extract text from images, which can save a lot of time. hit.

AmindPDF's user interface is very user-friendly and makes the operation of PDF easy. It can recognize PDF text as paragraphs or whole blocks of text, allowing users to edit text directly and smoothly, like in MS Word. for PDF protection, it allows adding passwords, setting document permissions, placing signatures, adding watermarks to PDF. It also supports batch operations to process files, such as merge/split tool, compression tool, creation tool, Bates numbering tool, and conversion tool, so users can process multiple PDF files at once. AmindPDF is available for a number of platforms: Windows, iOS, and Android. Users are able to use the same PDF tool on a computer or mobile phone. So AmindPDF let you process or edit PDFs anytime, anywhere. Edit PDF Text: AmindPDF allows the user to change the font, font size, font color, and font style, and reset the alignment of pdf text. Edit Images: The user can select the images in pdf, then manipulate the images: replace an image, rotate the image, crop the image, or remove the image. AmindPDF can combine more than one PDF or image file into one PDF. The file name of being combined files will be used to build the outline of the combined pdf.

Accelerate your document reviews and uncover facts with ease while discovering connections that others may overlook. LiquidText transcends traditional paper methods, as note-taking and document analysis tools have remained largely unchanged, relying on margin notes, highlights, and sticky notes that have been utilized for ages. Despite the rise of digital apps, a significant percentage—over 80%—of knowledge workers continue to favor paper in their professional and academic settings. However, LiquidText advances beyond these limitations by effectively capturing your reading materials, notes, highlights, and annotations, while also exposing the relationships among them and the source content. This innovative tool organizes your project’s elements in a clear and shareable format, allowing for a seamless connection between related notes and ideas. With just one tap, you can visualize these interconnections and access the original context, making it easier than ever to craft comprehensive reports from your insights. By transforming how you interact with your documents, LiquidText empowers you to work more efficiently and creatively than ever before.

LightPDF was created to make it easy for anyone to use PDF documents. LightPDF has an intuitive interface. This program allows you to read, edit, and convert PDF documents. Built-in PDF editing capabilities: 1. Modify a PDF: Add text, annotate and insert links. You can also add headers or footers. 2. Convert PDF to Word, Excel, PPT or JPG. 3. Manage PDF pages: Insert or delete pages, rotate pages and extract, replace, split, or merge pages. 4. Sign a PDF: Add a manual signature or digital signature. 5. Lock PDF: Add a password for your PDF document. 6. Other tools: OCR and compress PDF, add background, etc.

Experience a revolutionary online tool for managing your PDF and Kindle annotations, designed to save you countless hours of tedious work. Instantly download your annotations from PDFs and Kindle in multiple formats within seconds. Our service efficiently summarizes annotations from your PDFs, Kindle books, and Instapaper articles, eliminating the frustration of searching for an effective annotation tool. Sumnotes stands out as a straightforward yet powerful solution for extracting annotations from a variety of materials, such as PDF books, lecture notes, or research papers, allowing you to concentrate on what truly matters. With just one click, you can import and synchronize annotations across different platforms seamlessly. Additionally, our batch import feature makes it incredibly easy to bring in your entire library. We proudly support PDF documents annotated with any official PDF software, including Adobe and Preview on Macs, and we're thrilled to announce our new capability to support Kindle highlights as well! This tool is poised to transform the way you interact with your reading materials.

All-in-one online PDF editor, free of subscriptions and installations DeftPDF is an online tool that allows you to edit and convert your PDF files in just a few clicks.

The PDF Converter app allows users to easily convert any file on their iPad into a PDF document. You can access and download files from emails, cloud storage, or the internet directly on your device, transforming them into visually appealing PDFs in no time. This app is specifically designed for this function and excels at it. Whether it's a multi-million dollar contract or a simple web page, you can save it as a PDF within seconds. Indeed, PDF Converter is capable of generating high-quality PDFs from a wide variety of file types, including email attachments, iWork and MS Office documents, images, web pages, and many others. Once your PDF is created, you can utilize the robust features of PDF Expert to view, annotate, edit, or merge your documents seamlessly. The conversion results are precise and reflect the original content perfectly, as users maintain complete control over the process. Additionally, the app ensures total security, performing all conversions locally on the iPad without the need for an internet connection, meaning your files remain private and secure. Furthermore, this makes the app highly convenient for users who may not always have access to the internet.

MiniTool PDF Editor allows you to edit all of your PDF files. You can convert them to different formats, combine multiple documents into one, split a document into multiple files, and annotate the documents with various writing tools. MiniTool PDF Editor allows you to convert PDF files in many formats. Any PDF document can be converted to the following formats: Microsoft Word and Microsoft Excel, Microsoft Powerpoint, JPG and PNG, BMP, TXT and HTML, EPUB, CAD and XPS. You can convert any document in any of these formats into a PDF. This is how you can convert an ordinary image into PDF in just seconds. You can do the same with a spreadsheet. MiniTool PDF Editor is a great app that allows you to modify PDFs quickly and easily. You'll find it easy to use all the features.