ROT13 & Caesar Cipher
Encode text with ROT13 or any Caesar shift — and brute-force it. Encode and decode ROT13, the classic Caesar cipher with any shift 1–25, plus a brute-force decoder showing all 25 rotations. Free cipher tool for puzzles.
About the ROT13 & Caesar Cipher
The Caesar cipher shifts every letter a fixed number of places through the alphabet — ROT13 is the famous special case that shifts 13, making it its own inverse: encode twice and you are back where you started. This tool applies any shift to your text (case preserved, digits and punctuation untouched) and includes a brute-force panel showing all 25 rotations at once — the fastest way to solve puzzle ciphers and hidden messages in games.
How to use the ROT13 & Caesar Cipher
- Type or paste your message.
- Choose a shift — or hit ROT13 for the classic.
- Read the encoded output instantly.
- Use brute force to crack a message of unknown shift.
Key features
- ROT13 one-click encoding
- Any Caesar shift from 1 to 25
- Brute-force panel with all rotations
- Preserves case, spaces and punctuation
Is ROT13 secure?
Why does ROT13 decode as well as encode?
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