AES Encrypt / Decrypt — Free, No Upload, Browser-Based

AES Encrypt / Decrypt uses AES-256-GCM — the same cipher used in modern TLS — entirely inside your browser via the native WebCrypto API. Your key is derived with PBKDF2 (100,000 rounds of SHA-256), so brute-force attacks are expensive even against weak passwords. Because all processing happens client-side, your plaintext, password, and ciphertext never touch a server.

このツールの使い方

1. Open the tool, select Encrypt or Decrypt, then paste or type your text into the input field.
2. Enter your password and press the Encrypt (or Decrypt) button to run AES-256-GCM in your browser.
3. Copy the base64-encoded ciphertext (encrypt mode) or the recovered plaintext (decrypt mode) from the result panel.