zipsafe does everything inside this browser tab. There is no server that receives your files — open the Network tab and watch: not a single byte of your data is sent anywhere.
Drop a .zip to open it, or drop any files to bundle them
into a new archive. Your browser reads the bytes directly from disk.
A Web Worker runs the DEFLATE compression or inflation off the main thread, so the page stays responsive even on large archives. Progress is reported byte by byte.
Extracting? You see the full file tree from the archive's central directory — names, sizes, and compression ratios — before you save anything.
Save extracted files straight into a folder you pick with the
File System Access API,
or download them one by one. New archives download as a single
.zip. Either way, the data stays on your machine.
.zip you create is readable
by anyone you send it to — use
sealbox
if you need a password.A small, fast tool that opens and creates ZIP archives without ever uploading your files. Built because the obvious web search — "unzip a file online" — mostly turns up sites that want your private documents on their servers first.
zipsafe is open source and runs 100% client-side: vanilla TypeScript, the
fflate ZIP engine, and a Web Worker. No backend, no accounts,
no telemetry.