domainless · convert

Your files never leave this device

Most "free online converters" work by uploading your file to their server, converting it there, and handing back a download. That means a stranger's machine holds a copy of your photo, scan, or document — and you're trusting them to delete it. This converter is built the opposite way.
01What actually happens

1. You pick a file

It's read straight into your browser's memory — not sent anywhere. There is no upload step.

2. Your browser converts it

Images are decoded and re-encoded by your browser's graphics engine; audio by its Web Audio engine; video by the same encoders your browser already uses to record and play media; ZIP, TAR and gzip by its built-in compression engine; legacy text encodings by its own character-set decoders; PDFs, Word, Excel and data formats are assembled byte by byte in plain JavaScript — all running on your machine.

3. You download the result

The converted file is created locally and saved by your browser. The server only ever sent you the page — and, if you rendered a PDF to images, the PDF engine that does it, which is served from here rather than a third party.

02How you can tell
Turn off your network after the page loads and the converter still works — proof that nothing is being uploaded. This is the same principle behind the rest of the domainless tools: Encrypt, the Documents editor, the spreadsheet editor, the QR code generator and the VPN: do the sensitive work on your device, not someone else's. The one deliberate exception: if you sign in and choose to save a document or spreadsheet to your account, that copy is stored on our server so it can sync across your devices. Nothing else is. More questions → Back to the converter →