Online PDF annotation tool - AI tools

PDF Bob is a free online PDF editor that allows users to edit, annotate, create, and manage PDF documents without watermarks or ads.

• Free

I, Librarian is an online reference manager and PDF organizer that centralizes document storage, enables full-text search, and facilitates private group collaboration for students and research professionals.

• Other

Xodo is an all-in-one document solution offering powerful tools to manage, edit, convert, and sign PDFs, Office files, and images across web, desktop, and mobile platforms.

• Paid
• From 10$

PDF Buddy is a secure, web-based PDF editor that allows users to edit, fill, sign, and manage PDF documents directly in their browser. The tool offers convenience, safety, and an eco-friendly solution for managing PDFs without any software installation.

• Freemium
• From 8$

Smallpdf offers a suite of 21 tools to convert, compress, edit, and sign PDFs for free. Simplify your document management with a user-friendly interface and secure processing.

• Free Trial

GoodAnnotations provides AI-powered tools for drawing, editing, and annotating PDFs and screenshots to boost productivity and collaboration in digital workflows.

• Other

Afirstsoft PDF is an AI-powered PDF editor for creating, editing, converting, annotating, and organizing PDF documents across multiple platforms, featuring AI summarization and chat.

• Freemium

PDF PDF offers a comprehensive suite of free online tools for all your PDF needs, including conversion, merging, splitting, compression, and more.

• Free

ILovePDF3 provides a comprehensive set of free online tools for editing, converting, and managing PDF documents, images, and other file formats, catering to both individuals and businesses seeking simple digital document solutions.

• Free

PDF Reader Pro is an all-in-one PDF solution for viewing, editing, converting, annotating, and form-filling across Mac, Windows, iOS, and Android. It integrates AI features like translation, summarization, and rewriting to enhance document workflows.

• Pay Once

Sejda is a comprehensive PDF editing and management platform offering over 30 browser-based tools for tasks like editing, merging, splitting, converting, compressing, and securing PDF documents.

• Freemium
• From 8$

Online2PDF offers a robust suite of PDF conversion, editing, and management features for free, supporting multiple file formats and advanced customization options.

• Free

PDFAid is a comprehensive online PDF solution offering over 50 free tools for editing, converting, and signing PDF documents with powerful OCR capabilities and cross-platform accessibility.

• Free

Annotations is a Mac application that simplifies document annotation with highlights, keywords, and notes while maintaining document clarity, designed for researchers, students, and data analysts.

• Free

iLovePDF is a comprehensive online platform offering a full suite of PDF editing, conversion, and management tools designed to streamline document workflows for individuals and businesses.

• Freemium
• From 9$

HiPDF is a comprehensive online PDF tool offering editing, conversion, compression, and merging features, enhanced with AI for summarization, translation, and interaction.

• Freemium

Win PDF Editor is a Windows-based PDF editing software that enables users to modify PDF documents by adding text, inserting images, drawing shapes, removing content, deleting pages, and redacting confidential information. It also includes a PDF converter for transforming documents into various editable formats.

• Other

PDFinity is a comprehensive online PDF management platform offering tools to edit, convert, compress, split, merge, and sign PDF documents without requiring software downloads.

• Freemium

PDFBeat is a comprehensive online PDF toolkit offering free tools to edit, convert, merge, and organize PDF documents with fast performance and secure processing.

• Free

PDF2Go is an online PDF editor and converter offering 30+ tools to edit, merge, split, compress, and convert PDF files with AI-powered features for enhanced productivity.

• Freemium
• From 23$

PDF Editify offers a user-friendly platform for fast and easy PDF editing, allowing users to fill, edit, sign, redact, OCR, and create PDF forms with a focus on simplicity and security.

• Freemium

Advanced PDF Editor is an all-in-one PDF editing solution for Mac, offering over 40 features to edit, merge, convert, sign, and secure PDF files with ease and efficiency.

• Freemium
• From 4$

PDF AI Online is a comprehensive AI-powered platform designed to enhance your PDF interaction. It offers advanced features like reading, editing, summarizing, translating, and analyzing PDFs, enabling efficient information retrieval and processing.

• Paid
• From 4$

Scribble Together is a collaborative online whiteboard tool that enables real-time drawing, handwriting equations, diagram creation, and PDF markup across devices, with seamless sharing and no registration required for guests.

• Freemium
• From 5$

YellowPDF is an AI-powered online tool that offers a comprehensive suite of PDF management features including merging, splitting, compressing, converting, editing, and securing documents.

• Other

PDF Redactor Online is a secure web tool that permanently removes sensitive information from PDF documents directly in your browser, ensuring no data uploads or server involvement.

• Free

ComPDFKit provides comprehensive PDF SDKs for developers, enabling integration of PDF viewing, annotation, editing, conversion, and AI-driven document processing functionalities into applications across multiple platforms.

• Free Trial
• From 67$

UPDF is an AI-powered PDF editor available across multiple platforms (Windows, Mac, iOS, Android). It offers a comprehensive suite of PDF tools and AI features.

• Freemium

PDF.io delivers a suite of easy-to-use online PDF tools for splitting, merging, converting, and protecting PDF documents, with both free and premium access options. Unlock full capabilities to manage and process your PDFs efficiently and securely online.

• Freemium
• From 6$

PDF.to is a comprehensive online toolkit offering free PDF tools for merging, splitting, compressing, converting, rotating, and organizing PDF documents, along with various file format converters.

• Freemium
• From 9$