About this rot13 / caesar cipher
Shift Latin letters for puzzles and educational ciphers. Choose an integer shift between -25 and 25. Letters wrap around the 26-letter alphabet and keep their case. The default is ROT13. Work directly with your own text in this browser without signing in or uploading a document. Review the result before copying it into another application, and use Reset to clear the workspace when you are finished. The examples below show the exact behavior to expect, while the limitations explain cases where another workflow may be more suitable.
How the rot13 / caesar cipher works
Choose an integer shift between -25 and 25. Letters wrap around the 26-letter alphabet and keep their case. The default is ROT13.
ROT13 / Caesar Cipher examples
Hello!; shift 13
Uryyb!
Zebra; shift 1
Afcsb
Limitations & privacy
This is not secure encryption. Only ASCII letters shift; all other characters remain unchanged. Maximum text input: 100,000 UTF-16 units.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
ROT13 / Caesar Cipher: frequently asked questions
How does the rot13 / caesar cipher work?
Choose an integer shift between -25 and 25. Letters wrap around the 26-letter alphabet and keep their case. The default is ROT13.
What can I inspect in the rot13 / caesar cipher result?
The cipher alphabet mapping helps you check the result before using it. This is not secure encryption. Only ASCII letters shift; all other characters remain unchanged. Maximum text input: 100,000 UTF-16 units.
Does the rot13 / caesar cipher upload my input?
Processing happens in your browser. No tool input or output is uploaded to a server. Use Reset to clear the current workspace before starting a separate task.
Updated September 20, 2026