Encrypts and decrypts text using the Caesar cipher — a substitution cipher that shifts each letter by a fixed number of positions in the alphabet. Configure the shift amount (1–25). A brute-force mode shows all 26 possible shifts at once so you can identify the correct decryption without knowing the shift value.
Enter text and a shift to encrypt or decrypt with the Caesar cipher — or brute-force all 26 shifts to break an unknown cipher.
Generate HMAC signatures using SHA-256, SHA-512, and other algorithms.
Check password strength against security criteria and estimate crack time.
Validate credit card numbers using the Luhn algorithm.
Validate and parse International Bank Account Numbers (IBANs).
Validate ISBN-10 and ISBN-13 numbers and convert between them.
Encode text to hexadecimal or decode hex back to text.