Caesar, ROT13, Atbash & Vigenère
Classic cipher toolkit
100% local — nothing is uploaded
Shift: 3
Output
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How to use
- Pick a cipher: Caesar, ROT13, Atbash or Vigenère.
- Set the shift (Caesar) or the letter key (Vigenère).
- Choose encode or decode.
- Copy the transformed text.
FAQ
Are these ciphers secure?
No — they are historical and trivially broken by frequency analysis. Use them for puzzles and learning, never for real secrets.
What is ROT13?
A Caesar cipher with a shift of 13. Applying it twice returns the original text, so encoding and decoding are identical.