Back
ROT13 & Caesar cipher
Encoding
Loading
Loading tool
Preparing the tool. The remaining time is not yet known.
All processing for this tool happens in your browser. Your input is not sent to a server.
About this tool
Shift ASCII letters with a Caesar cipher or ROT13 while preserving other characters.
Common uses
- Shift ASCII letters with a Caesar cipher or ROT13 while preserving other characters.
- Enter text and an integer shift; choose 13 for ROT13.
How to use it
- 1.Enter text and an integer shift; choose 13 for ROT13.
- 2.Encode to shift forward or decode to shift backward, preserving letter case.
Worked example
Input and result
Hello! (shift 13)
Uryyb!
Punctuation remains unchanged and the letter case is preserved.
Limits and notes
- The shift wraps modulo 26 and only A–Z/a–z change. This reversible substitution is for puzzles or obfuscation, not secure encryption.
Frequently asked questions
What does this tool do?
Shift ASCII letters with a Caesar cipher or ROT13 while preserving other characters.
What should I check before using the result?
The shift wraps modulo 26 and only A–Z/a–z change. This reversible substitution is for puzzles or obfuscation, not secure encryption.