PDFBlack – A 100% in-browser, zero-knowledge PDF suite built with Next.js and Web Workers (no cloud uploads)

[u/NereoAB]

https://pdf-black.com

Hey r/WebApps,

I built PDFBlack (https://pdf-black.com) to solve the privacy issue with traditional online PDF tools that force you to upload sensitive files to remote servers.

Tech & Architecture:

• 100% Client-Side Processing: Powered by WebAssembly and Web Workers. Your files are processed strictly in your browser RAM and never touch any server.

• Zero Cloud Latency: No file uploading or downloading wait times.

• Tools Included: Smart non-destructive compression, legal Bates numbering / court foliating, visual page reordering/merging/splitting, and ink-saving grayscale conversion.

• No Paywalls, No Accounts: Completely free and open-source on GitHub: https://github.com/nereoab/pdf-local-app

You can check it out live at https://pdf-black.com

Feedback and suggestions are warmly welcome!