ROT13 & Caesar Cipher
Encode and decode text with ROT13 or a custom Caesar cipher shift (1-25). Free online tool, no signup, runs in your browser.
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Frequently asked questions
- What is ROT13?
- A simple Caesar cipher shifting each letter by 13. Applying twice returns the original text, so the same function encodes and decodes.
- Is ROT13 secure?
- No. Zero cryptographic security. Only useful for hiding spoilers or casual obfuscation, never for sensitive data.
- What does the shift slider do?
- Sets how many positions each letter moves (0-25). Shift 13 is ROT13; shift 3 is classical Caesar.