Why I Built a 100% Private File Converter Using WebAssembly (No Server Uploads)

Most "free" online file converters are a privacy nightmare. When you upload a PDF or an image to "https://www.google.com/search?q=ConvertMyFile.com," your sensitive data is sitting on a random server. I wanted to change that. That’s why I built FileMint. 🛠 The Problem with Cloud Processing
Traditional tools use the "Upload-Process-Download" model. This is slow (due to upload speeds) and risky for privacy. If you are merging a legal contract or a personal photo, you shouldn't have to trust a third-party server. ⚡ The Solution: Client-Side WebAssembly
To make FileMint truly private, I decided that zero files should ever leave the user's browser. I achieved this using: WebAssembly (WASM): For heavy lifting like PDF merging and image compression. By using C++ and Rust libraries compiled to WASM, the browser gets near-native speeds. JavaScript File API: To handle file streams locally without a backend. React & Tailwind: For a clean, fast UI that works on mobile and desktop. 🔒 Why Privacy-First Matters
Since the processing happens in the user's RAM, there is: Zero Latency: No waiting for files to upload. Zero Data Leaks: I literally cannot see your files even if I wanted to. Offline Access: Once the site is loaded, it works without an internet connection. I’ve launched over 30 tools including a JSON to CSV Converter and a Secure PDF Merger. What’s Next?
I’m currently looking into adding OCR (Optical Character Recognition) entirely in the browser using Tesseract.js. Check out the project here: https://www.filemint.dev/ I’d love to hear your thoughts on the architecture. How are you handling file privacy in your web apps? Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink. Hide child comments as well For further actions, you may consider blocking this person and/or reporting abuse