Compare the Top PDF Annotators as of April 2026

What are PDF Annotators?

PDF annotation tools are pieces of software designed to allow users to add notes and highlight text on PDF documents. They can be used by students or professionals to mark up documents, make comments, and organize information in an intuitive way. Annotations may also include drawing shapes or adding images. The annotations can then be saved with the document for easy sharing and future reference. Compare and read user reviews of the best PDF Annotators currently available using the table below. This list is updated regularly.

  • 1
    DocMadeEasy

    DocMadeEasy

    iDeskCentric

    From NDAs to loans, from sales contracts to offer letters, Our eSignature tool DocMadeEasy helps companies of all sizes streamline and digitally sign their most critical documents. Unlimited electronic signatures are included in every subscription, plus powerful document features such as hosted sign, bulk sign and templates. Our tool is also a powerful PDF editor. You can use it to annotate pages, insert images, create or manage fields, whiteout texts, merge PDFs, and more. You can also use our service to securely share files with real-time control and insights. End-to-end encryption with AES256. Track and analyze how recipients engage with each page of
    Starting Price: $0
  • 2
    Nitro PDF

    Nitro PDF

    Nitro Software

    Nitro PDF is a full-featured PDF editor and is recognized as the strongest alternative to Adobe Acrobat. It's simple to purchase, easy to implement, and straightforward to use. With a powerful suite of tools, you can easily edit, convert, sign, annotate, combine, secure, and protect your documents, streamlining workflows and allowing you to focus on what matters. Our flexible plans and affordable pricing cater to everyone, from individual users and small teams to large enterprises. Plus, we offer a wide range of support resources to ensure the success of every customer.
    Starting Price: $15/user/month
  • 3
    UPDF

    UPDF

    Superace Software Technology Co., Ltd.

    UPDF supports editing, annotating, and managing PDF seamlessly on for Windows, Mac, iOS and Android. You can get every tool you need to edit, annotate, and organize your PDF files in one premiere all-rounder smart application. It is explicitly designed to meet the desire of most users for a stunning yet very comprehensible interface that is not just only for beginners. Key Features: 1. Edit PDF Document - You can add or delete texts as well as edit the text's properties and formats such as its font style, font color, and size. - You can also crop, rotate, replace, extract or delete images. 2. Annotate PDF - Easily highlight, underline, and strike out those parts. You can also add shapes, sticky notes and text boxes for a quicker and easier means of adding texts. 3. PDF Page Management - Rotate, delete, extract and rearrange PDF pages as you need. 4. View and Navigate PDF Files - Flexible reading mode such as single page mode or double-page mode.
    Starting Price: Free
  • 4
    SignFlow

    SignFlow

    PDF Technologies

    Simple but mighty! SignFlow makes reading, annotating, editing, e-sign, organizing, filling, secure PDFs effortless! Packed with essential PDF tools, SignFlow is your best PDF files partner. SignFlow allows you to apply a legally-binding digital signature in PDFs, and it provides an effortless PDF solution for you to create, edit and fill out PDF forms. You can edit text in PDFs like word, manage and edit PDF pages, annotate and view your PDFs. Enjoy different reading modes, such as Full-Screen, Single Page, Read Mode, Split View, Multi-tab. You can smoothly scroll pages and switch between day mode, night mode and eye-protection mode. Annotate to remember! You can highlight, underline, strikethrough texts in PDF. There are colors for you to emphasize different information. Enrich your PDFs with standard business stamps like APPROVED, digital stamps, dynamic stamps and custom text/image stamps.
  • 5
    LightPDF

    LightPDF

    Wangxu Technology Co.,Ltd.

    LightPDF is an all-in-one, AI-powered PDF productivity platform designed to help users create, understand, and manage documents more efficiently across devices. It integrates advanced AI tools such as an AI PDF Generator, AI presentation creation, PDF-to-mind-map conversion, document translation, and an AI Agent—with a complete set of PDF capabilities including watermark removal, file conversion, encryption, compression, and other essential document-processing features—enabling users to handle complex PDF tasks more efficiently in one place. With both intelligent automation and reliable PDF tools, LightPDF helps users work smarter and faster whether they are studying, working, or collaborating.
    Starting Price: Free
  • 6
    DeftPDF

    DeftPDF

    DeftPDF

    An all-in-one free online PDF editor that does not require subscriptions or installations! DeftPDF is a free online tool that makes editing and converting easy in just a few clicks! Our servers process the files for you. Files stay secure. After processing, they are permanently deleted. Use the PDF editor to edit & sign PDF files online for free. You can also fill out PDF forms online, change or add text on a PDF, edit existing PDF text, add images, create links or edit hyperlinks, and annotate in your PDF document. You can be assured that your files are safely uploaded over an encrypted connection. The files will permanently be deleted after processing. To upload files from Dropbox, Google Drive or from a website where your files are located, expand the drop-down list and select your files. You can edit any existing text on the document and change fonts or format such as bold, italic, size and color.
    Starting Price: Free
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