🔁 Security

ROT13 Cipher

Apply the ROT13 cipher (rotate by 13 letters) to text. Applying twice returns the original. Used in forums to hide spoilers. Only A–Z and a–z are affected. Everything in your browser.

Entrada Saída

ROT13 é simétrico — aplicar duas vezes retorna ao original.

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Encrypt Text

Apply classic ciphers (Caesar, ROT13, Atbash) or Base64. Useful for puzzles, CTFs and testing — do not use for real security.

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Password Strength Checker

Check the strength of a password with entropy calculation, common-password check and improvement tips. Runs in your browser — no data is sent.