You need to send something private, not post it
A password, an API token, a draft you are not ready to share — you want it scrambled so only the right person can read it, but you do not want to paste it into a random encryption website that quietly keeps a copy. The safer path is local, passphrase-based encryption you control.
Encrypt it on your own device
Open the AES Encrypt / Decrypt tool and type your text with a passphrase. It uses AES-256-GCM with a key derived from your passphrase via PBKDF2, so the ciphertext stays meaningless without that exact passphrase. Copy the output and send it through any channel you like — only someone with the passphrase can reverse it.
A strong passphrase is the whole game
The cipher is only as good as the secret that unlocks it. If you are choosing a passphrase by hand, the Password Generator can produce a long, random one with the character sets you want. Share the passphrase separately from the ciphertext — over a different channel — so interception of one does not defeat both.
When this is the right tool
- Locking a note before storing it in a synced file or clipboard manager.
- Handing a credential to a teammate without trusting the transport.
- Demonstrating envelope encryption without standing up a backend.
Because the work happens entirely in your browser, the plaintext never touches a server — which is the point.