Caesar Cipher / ROT13
Shift ciphers — encode and crack
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About the Caesar Cipher / ROT13
Encrypt and decrypt Caesar shift ciphers including ROT13, with a brute-force mode that shows all 25 possible shifts at once for cracking unknown messages. A classic introduction to cryptography, puzzle solving, and CTF warm-ups.
How to use
- 1Choose Encrypt or Decrypt and set the shift (ROT13 button included).
- 2Type your message.
- 3In decrypt mode, scan the brute-force list to spot readable text.
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Caesar Cipher / ROT13 is part of DevKit — 100 free, privacy-first tools for developers, students, and everyone, built by Minhazul Ashim. Everything runs in your browser; your data never leaves your machine.