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Convertum processes PDFs, images, JWTs and hashes entirely in your browser

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A developer has launched Convertum, a free browser-based toolkit that handles common developer tasks such as JWT inspection, PDF manipulation, image conversion, and cryptographic hashing without uploading any data to external servers. All processing runs locally in browser memory using WebAssembly, the Web Crypto API, and HTML5 Canvas, meaning sensitive files and tokens never leave the user's machine. The tool addresses a common privacy concern with popular online utilities that route confidential data through third-party cloud backends, often behind paywalls or usage limits. Convertum is available as both a web app and a Chrome extension, with the extension supporting a Side Panel mode for use alongside active browser tabs. Built with React, TypeScript, and Vite, it also supports specialized formats including Apple HEIC images, Korean HWP documents, and European e-invoice standards like XRechnung and Factur-X.

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