How is this private?

Most online file tools upload your file to their servers, process it there, and send it back. FileAnvil doesn't. Your file is read, processed, and saved entirely inside your browser tab using WebAssembly. It never travels across the network.

The data flow

🔒 YOUR DEVICE — FILES NEVER LEAVE 📄 Your file ⚙️ Processed in your browser (WebAssembly) 💾 Your download no upload — this never happens ☁️ Someone else's server ● only anonymous page stats ever leave — never your file contents

No server ever touches your file. The only thing that leaves your device is anonymous, aggregate page analytics — never file contents. Details in the privacy policy.

Prove it yourself

  1. Airplane-mode test: turn off Wi-Fi, then use any tool. It still works.
  2. Network-tab test: open your browser's developer tools → Network tab, process a file, and watch: there is no upload request carrying your file.
A browser Network panel on the FileAnvil image compressor: the only requests listed are the page's own assets — the document, stylesheet, scripts, fonts and icon (8 requests, all status 200). When a 4.2 MB photo is dropped in and compressed to 0.9 MB, no new request appears — 0 new requests, 0 bytes uploaded.
The eight requests are the page loading itself. Compressing your photo adds zero — 0 bytes uploaded. Don't take our word for it: try it in your own Network tab.

Why this matters

If you handle client documents, medical records, financial statements, or anything confidential, uploading them to a third-party server can itself be a compliance problem. Because FileAnvil never uploads your files, that risk simply doesn't exist.