🗝️ Security

Vigenère Cipher

Encrypt and decrypt text with the polyalphabetic Vigenère cipher using a keyword. More robust than Caesar by using multiple shifts. Everything in your browser.

Modo Chave (somente A-Z, a-z)

Entrada Saída

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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.