pdf-annotations

DartPDF is a free, local PDF editor for Android, iPhone, iPad, Mac, Windows, Linux and web. Annotate, fill forms, sign and redact without an account. The repository also contains a pure-Dart PDF engine and Flutter viewer/editor SDK.

Read PDFs with LLMs — @mention threads on passages, or generate interactive chapter summaries

Vue 3 PDF viewer with draggable and resizable overlay elements for signatures, forms, annotations and document workflows.

Sync a personal Zotero library and PDF annotations to Obsidian Markdown.

Aspose.PDF for .NET — Agentic, AI-generated C# examples. 2,600+ verified, compile-tested snippets covering conversion, forms, signatures, annotations, and more.

Cross‑platform PDF tooling built on the open‑source PDFium engine

Kotlin-native PDF library for Android. Create, edit, merge, split, annotate, encrypt PDFs. Affordable iText7 alternative — free for personal use, $99/year for commercial.

Zero-dependency Rust→WASM PDF engine + TypeScript SDK — read, edit, render, OCR, sign, redact and convert PDFs (↔ Office/HTML/RTF/PDF-A) with no third-party libraries.

This repository demonstrates how to add or remove stamp annotations in PDF documents using C# and the Syncfusion .NET PDF Library. Learn to apply standard approval stamps,embed custom image stamps like logos/signatures,and remove existing stamps programmatically-ideal for automating document workflows,branding, status tracking in .NET applications.

Free, privacy-first web tool to extract PDF highlights, notes, and comments into Obsidian, Notion, Markdown, and CSV. 100% offline & local. Live at pdfannotations.com.

Keep reading work through PDF revisions with auditable, user-reviewed Zotero annotation transfers.

Adobe Acrobat Reader Free | 免费PDF阅读与编辑工具，内置高效文本高亮、表单填写和注释模版。专为快速本地部署而设计，提供稳定的文档浏览、格式转换辅助与多端数据同步功能。

LeafSide: a fast, native PDF reader for Windows with smooth scrolling, highlights and notes, on ARM64 and x64 (WinUI 3 + PDFium)

Click-to-edit PDF editor — retype any line of a PDF in the browser and export a genuinely edited file, with pen, highlighter, arrows, shapes, text boxes and images. One HTML page, one Python backend. A free script by wholesaas.com.

PDF Compare Viewer V2 - Side-by-side PDF comparison with native annotation support, sync/zoom, and hand pan/zoom

Free, privacy-first PDF toolkit that runs entirely in your browser, no uploads, no sign-up. Annotate & sign, fill editable forms, convert images to PDF, merge, split into individual pages, and AI-summarize documents. Light/Dark themes, English/French. Your files never leave your device.

Extract reviewer comments hidden behind underlines/highlights in a PDF. One command turns a 'reviewed' PDF into a clean checklist. PyMuPDF-powered, Claude Code skill included.

A library that extracts comments from PDFs into structured document ready to be fed into an AI agent

One-shot bulk export of your entire Zotero library to Obsidian markdown, with PDF annotations and zotero:// jump links. No API key needed.