Symmetric AES-GCM encrypt and decrypt text with a passphrase
About
Encryption uses AES-GCM (256-bit, authenticated) with a key derived from your passphrase via PBKDF2-SHA-256 (150,000 iterations). The output is base64 of salt(16) ‖ iv(12) ‖ ciphertext+tag. All cryptography runs locally — your text and passphrase never leave the browser.