Encrypt text so that only someone with the right key can read it. Type or paste your content, then Encrypt & Copy to get encrypted text you can paste into chat or email. After encrypting you can also download it as an .enc file. To decrypt, open an .enc file or paste the encrypted text — the button will switch to Decrypt mode. Share your public key with others so they can encrypt messages that only you can read. A keypair is generated automatically on your first visit.
This tool uses hybrid encryption: a 256-bit AES key encrypts your content, then a 4096-bit RSA key encrypts that AES key. This is the same approach used by PGP, TLS, and other widely trusted systems. Your public key is safe to share — anyone can use it to encrypt a message for you, but only your private key can decrypt it. When you have both keys, your content is also signed with your private key, letting the recipient verify it came from you. Keep your private key secret and backed up. Everything runs locally in your browser using the Web Crypto API — no data is sent to any server.