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Dev.to
7/18/2026
The original title is "I built a toolbox where your files never leave the browser"

The original title is "I built a toolbox where your files never leave the browser"

Original: I built a toolbox where your files never leave the browser

Short summary

Yunknow Toolbox is a free, browser-based suite of file utilities where everything runs client-side—nothing is uploaded. It handles image conversion/compression via Canvas API, HEIC/TIFF decoding via WebAssembly, PDF operations via pdf-lib and pdf.js, and various text utilities. Built with Astro on Cloudflare Pages, it works offline as a PWA and supports four languages.

  • •All file processing happens in-browser; no uploads, no account required
  • •Supports image conversion, PDF operations, HEIC/TIFF decode, and text utilities like JSON/Base64/JWT/QR
  • •Built with Astro on Cloudflare Pages, multilingual, works offline as a PWA

Generated with AI, which can make mistakes.

#ai-tools#open-source
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