I built 50+ free browser tools that run without uploads, servers, or accounts

Short summary

Developer built NexaTools, a suite of 50+ browser-based utilities that run entirely client-side using WebAssembly, WebRTC, and PWA technologies. Tools include media converters, PDF manipulation, code formatters, and P2P file transfer — all without uploading data to servers or requiring accounts. The post details the technical stack and lessons learned around FFmpeg WASM, privacy-first design, and PWA caching challenges.

• •50+ browser tools running client-side via WASM, WebRTC, and PWA
• •Privacy-first: no uploads, no accounts, works offline after first load
• •Stack uses FFmpeg WASM for media processing and WebRTC for P2P file transfer

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