Caesar Cipher / ROT13
Encode or decode with a Caesar shift — ROT13 by default. Live output, quick presets, and a brute-force view of all 25 shifts.
How to use
Type text, choose Encode or Decode, and drag the shift (13 is ROT13, its own inverse). The result updates live — each letter moves that many places through the alphabet, case is kept, and non-letters pass through unchanged.
Don't know the key? Press Try all 25 shifts to see every possible decoding at once and spot the readable one. It's a fun classic cipher, not real security.