How ROT13 and Caesar shifts work
Every letter is rotated a fixed number of positions through the alphabet; digits, punctuation, and spacing are left unchanged.
ROT13 Text Encoder
Rotate letters through the alphabet with ROT13 or a custom Caesar shift. Runs entirely in your browser — input is never uploaded.
English
0 chars0 bytes
Output
Ready0 chars · 0 bytes
Processed locally. Your data never leaves this device.UTF-8 text ↔ ROT13 / Caesar
ROT13 is not encryption
A Caesar shift has only 25 possible keys and is trivial to brute-force. It is meant to obscure spoilers or answers from casual reading, not to protect secrets.
Frequently asked questions
A shift of 13 is its own inverse, so the same shift value both encodes and decodes. Any other shift decodes with (26 − shift).