Lock any file behind a password before you send it somewhere you don't fully trust: email, cloud storage, a USB stick you're handing over. The file never leaves your device, and neither does your password.
Your password is run through PBKDF2 (600,000 rounds of SHA-256) with a random salt to produce a key, then your file is encrypted with AES-256-GCM, the same building blocks used by password managers and full-disk encryption. This page loads no outside code at all to do it: everything here comes from the Web Crypto API already built into your browser. There is no way for us, or anyone, to recover a file if the password is lost. There's no backdoor and no reset link, so keep the password somewhere safe. Every encrypted file also starts with a short, plain-text note pointing back to this page, readable even in a text editor, in case the file ever gets separated from your instructions. That note reveals nothing about what's inside; everything past it is fully encrypted.
Click to choose files or drag them here
Plain files get encrypted; files this tool already encrypted (.mrjenc) get decrypted