filesnever leaveyour device.
[ why this exists ]
common file conversions today require uploading personal documents to ad-supported third-party sites of unknown provenance. this site does the conversion entirely in the browser, so no file ever traverses the network.
[ verify it yourself ]
- open devtools (cmd+option+i on macos, f12 on windows/linux).
- switch to the network tab.
- set the filter to “fetch/xhr”.
- drop a file in any tool on this site.
- click convert.
- observe: zero new requests during conversion.
page-load assets show on first visit and are then cached. nothing is fetched during the actual conversion step.
[ how it works ]
- static export. no server runtime — the entire site is html / js / css / wasm served from a cdn.
- web worker per conversion. conversion code runs off the main thread; large files don't freeze the tab.
- strict csp.
connect-src 'self'makes off-origin fetches structurally impossible — not a promise, an enforced header.
[ engines ]
— loading engines —