Password-protect ZIP files.
ZIPs locked with AES-256 — encrypted on your own device.
Drop any files here
or browse your files
Paste with ⌘V · or drop files anywhere on the page
Files never leave your device. Everything runs in your browser, nothing touches a server — tools you've used even work offline.
Put a password on a ZIP entirely in your browser — your files are bundled and encrypted with AES-256 on your own device, so neither the files nor the password ever travel anywhere. Drop files, set a password, download one locked .zip.
How it works
- Drop files anywhere on the page, click to browse, or paste with ⌘V.
- Pick a quality or preset — or set an exact target size and let the tool find it.
- Compress, compare before/after, and download — individually or as a ZIP.
Real encryption, not the broken kind
ZIPs can be "protected" two ways: the legacy ZipCrypto scheme, which has been practically crackable for decades, and AES-256, which is the same encryption class banks and disk encryption use. This tool always writes AES-256 — a password here actually protects the contents. The encryption happens inside the page as the archive is built; the password is used in memory and never stored or transmitted.
One honest limit of the ZIP format itself: the file names stay visible even in an encrypted ZIP — anyone can list the contents, they just can’t open them. If the names are sensitive too, Protect 7Z can hide the entire file list behind the password.
Opening it on the other side
Because ZipCrypto is broken, this tool doesn’t write it — but that means the built-in extractors in Windows Explorer and macOS Finder, which only understand the legacy scheme, will ask for the password and then fail. Recipients need a free unarchiver: 7-Zip or WinRAR on Windows, Keka or The Unarchiver on macOS, and most Linux file managers handle it out of the box. Mention that when you share the file.
Frequently asked questions
What if I forget the password?
The files are gone — that is what real AES-256 encryption means. There is no backdoor, no recovery, and this site never sees or stores the password, so it cannot help either. Keep the password somewhere safe.
Why won’t Windows Explorer open my protected ZIP?
Built-in extractors only support the obsolete ZipCrypto scheme, which is trivially crackable — this tool deliberately writes AES-256 instead. Free tools like 7-Zip, WinRAR or Keka open it with the password.
Are the file names hidden too?
No — that is a limit of the ZIP format itself: contents are encrypted, the file list is not. If the names must be secret as well, use Protect 7Z, which can encrypt the headers so even the list needs the password.
Is it private?
Yes. Archives are built and converted entirely in your browser — neither the archive nor the files inside it are ever uploaded, and any password you set is applied locally. The server does nothing but deliver this page. Want proof? Run one file through, switch your connection off, and run another — it still works.