End-to-end passphrase encryption
Uses AES-256-GCM symmetric encryption — the ciphertext is unreadable without the correct passphrase, providing strong confidentiality.
Secure Message Encryption
Encrypt private notes and messages with military-grade AES-256-GCM encryption in your browser. Send secret encrypted texts safely.
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How to use Secure Message Encryption
- 1
Type or paste the message you want to encrypt.
- 2
Enter a strong passphrase that the recipient will also know.
- 3
Click Encrypt to generate the encrypted ciphertext.
- 4
Share the ciphertext with the recipient — they use the same passphrase to decrypt it.
Why use this tool?
No account or server storage
Encryption and decryption happen entirely in your browser. No messages or passphrases are transmitted to any server.
Works across any channel
Copy the encrypted text and send it via email, SMS, Slack, or any messaging app — the ciphertext is safe to transmit over insecure channels.
Frequently asked questions
What encryption algorithm is used?
AES-256-GCM (Advanced Encryption Standard with Galois/Counter Mode) — the same algorithm used by governments and financial institutions for classified data. It provides both confidentiality and integrity verification.
What happens if I forget the passphrase?
There is no recovery mechanism. The encrypted message cannot be decrypted without the exact passphrase. Store the passphrase securely and share it through a different channel than the ciphertext.
Is this suitable for highly sensitive data?
The encryption is strong, but the security of the overall system depends on how you share the passphrase. Never send the passphrase and ciphertext together. For highly sensitive communications, consider purpose-built end-to-end encrypted messaging apps like Signal.
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