FTFreeTools
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AES / RSA Encryption

AES-GCM/CBC/CTR and RSA-OAEP through the browser's native Web Crypto, with keys staying on your machine — and no ECB or fixed-IV convenience mode.

Runs in browserEncryptionWeb Crypto

Last changed in v0.9.8

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How to use

  1. Pick AES or RSA-OAEP. AES defaults to GCM, which carries an authentication tag — tampered ciphertext fails instead of decrypting into garbage.
  2. AES keys must be exactly 16 / 24 / 32 bytes; your passphrase is never zero-padded into a legal length.
  3. RSA-OAEP encrypts one short payload per operation, and the limit is computed for you in the UI.

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