Developer launches browser-based toolbox that processes files entirely offline

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A developer has built Yunknow Toolbox, a free suite of online utilities where all file processing happens locally in the browser without any server uploads. The platform supports image conversion, PDF editing, JSON formatting, QR code generation, and more, using technologies like WebAssembly, Canvas API, and pdf-lib. Privacy was the core motivation, as the creator wanted a safe way to handle sensitive documents like contracts and ID scans without trusting third-party servers. The toolbox works offline as a Progressive Web App and requires no account or installation. It is built with Astro, hosted on Cloudflare Pages, and available in English, Chinese, Japanese, and German.

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