Encrypt / Tools
Encrypt & decrypt
Protect text or a file with a passphrase. It's sealed with AES-256-GCM in your browser — nothing is uploaded, and only the passphrase can open it.
The most secure way to use this tool is to not have to trust us.
Like any website, this page's code arrives from our server on every
visit — if that server were ever compromised, so is the page. Take us
out of the loop:
download the offline app
(one file, verifiable, works forever) or
run your own copy from source.
Same tool, same formats, no trust required.
Choose a file or drop it here to encrypt
Any size of file works — it's encrypted in 4 MB pieces right in your browser, and nothing is ever uploaded. Encrypting also hides the original filename inside the container; decrypting restores it. In Chrome and Edge the result streams straight to disk, so even multi-GB files stay light on memory.
Curious what's happening under the hood? The How it works page writes out the exact method, and the FAQ covers lost passphrases and what to share where.