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Caesar & Classic Cipher Tool

Encode, decode and crack Caesar, ROT13, Vigenère, Atbash, Affine, Rail Fence, Bacon, Polybius and substitution ciphers. Free, no sign-up, and it runs in your browser — your files are never uploaded.

How to use

1. Pick a cipher and Encode or Decode
2. Type text and set the shift, keyword or key
3. Copy the result — or brute-force Caesar and use frequency analysis to crack a message

Questions

Do I need an account?

No. Every tool is free to use without signing up.

Is my data uploaded?

No. This tool runs in your browser, so the text and files you use stay on your device.

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