Free and open-source PDF editor for Windows with a built-in PDF 2.0 engine. View, annotate, OCR, merge, split, crop, rotate, compare, edit text, draw, sign, fill forms, print, flatten, and open password-protected PDFs without a subscription.

A plugin for reading and annotating PDFs and EPUBs in obsidian.

A mind map, outline for obsidian,It support mobile and desktop

An annotation extension based on the PDF.js viewer. Supporting the editing of existing PDF file annotations, posting comments, replying, submitting annotation data, and loading for further editing. 一个基于 PDF.js 阅读器的批注扩展，支持对现有 PDF 文件批注的编辑、发布评论、回复、提交批注数据以及加载后续编辑功能。

THE reference manager with features including PDF reading/annotating, Markdown/Excalidraw note-taking, project/note linking, and more...

THE reference manager with features including PDF reading/annotating, Markdown/Excalidraw note-taking, project/note linking, and more...

📄 Set of modern React components for PDF highlighting

React PDF viewer & annotator SDK — highlight, markup, ink, shape, stamp and signature annotations with comments, review workflow and collaborative permissions. Export to PDF/Excel. React PDF 查看与批注 SDK， 支持高亮、笔迹、图形、印章、签名、评论审阅与协作权限。

PDF Manipulator: A versatile toolkit for editing, annotating, merging, splitting, compressing, and converting PDFs. Seamlessly add pages, extract images, and preview files with intuitive drag-and-drop. Fully responsive across devices for effortless document management.

Vue3 PDF viewer & annotator SDK — highlight, markup, ink, shape, stamp and signature annotations with comments, review workflow and collaborative permissions. Export to PDF/Excel. Vue3 PDF 查看与批注 SDK， 支持高亮、笔迹、图形、印章、签名、评论审阅与协作权限。

pdf annotator not installing on windows 11 — practical Windows notes: install steps, typical errors, and where to get PDF Annotator working on PC.

View and edit PDF documents with customisable VIM keyboard shortcuts

Question-answering system for Zotero libraries with a 3-stage RAG pipeline: FAISS retrieval → CrossEncoder reranking → extractive QA. Features GROBID parsing, question expansion, multi-color PDF highlighting, and Streamlit interface. Ask questions, get answers with sources.

Annotation layer for pdf.js (forked from instructure's pdf-annotate.js)

PDF format annotation and labeling support for Label Studio

Small Project of a PDF annotation tool written in C++

Pdf annotator

Fill PDF forms and annotate PDFs locally — text, shapes, signatures. Nothing leaves your machine.

Install PDF Annotator on Windows and fix setup errors, update issues, or launch failures with these troubleshooting steps.

A lightweight client-side PDF viewer and annotation tool written using Codex