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

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

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.

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

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

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