Cryptography
Encrypt, decrypt and hash with common algorithms.
Text to encrypt
Encrypt and decrypt text online with AES-256
Cryptography encrypts text with a passphrase using AES-256-GCM — industry-standard authenticated encryption — entirely inside your browser. Nothing is ever sent to a server.
Why use this tool
AES-256-GCM encryption
The same authenticated encryption standard used by modern password managers and secure messaging apps.
PBKDF2 key derivation
Your passphrase is stretched through 150,000 PBKDF2 iterations before use, making brute-force attacks far more costly.
Self-contained output
The encrypted result bundles its own salt and IV, so you only need to share the encrypted text and the passphrase to decrypt it.
Zero server involvement
All cryptographic operations run locally using your browser's built-in Web Crypto API.
How it works
- 1Choose Encrypt or Decrypt.
- 2Paste your text and enter a passphrase.
- 3Click the button and copy the result.
Frequently asked questions
Good to know
- Uses AES-256-GCM with a PBKDF2-derived key (150,000 iterations) — the same standard used by password managers.
- The passphrase never leaves your browser and is never stored anywhere.
- You need the exact same passphrase to decrypt — there's no recovery if you forget it.