Text Encrypt Decrypt — Free Online Password-Based Text Encryption

Password-based text encryption lets you protect sensitive information — passwords, API keys, private notes, credentials — before sharing them through insecure channels. By encrypting text with a strong password, even if the ciphertext is intercepted, the contents remain unreadable without the key.

This tool uses AES-256-GCM, an authenticated encryption algorithm. The "authenticated" part is crucial: GCM mode produces an authentication tag that verifies the ciphertext hasn't been modified. Any tampering with the encrypted data causes decryption to fail with an error, rather than silently returning corrupted plaintext.

PBKDF2 key derivation with 100,000 iterations makes brute force password attacks expensive. Each encryption uses a unique random salt, so the same password+plaintext combination produces different ciphertext every time. All operations run in your browser's Web Crypto API — no data leaves your device.