About ROT13 and Caesar ciphers
ROT13 is a simple letter-substitution cipher that rotates each letter 13 places through the alphabet — applying it twice returns the original text. A Caesar cipher does the same with any shift amount. Both are classic teaching tools and are used to hide spoilers and puzzle answers.
Tips
- ROT13 is its own inverse — encode and decode use the same step.
- Adjust the shift for a general Caesar cipher.
- These ciphers are for fun and learning, not real security.