Developer Tools
Apply the ROT13 letter shift to text instantly.
Use this ROT13 encoder to transform text with the classic 13-letter rotation cipher. It is useful for puzzles, learning exercises, quick obfuscation, simple text experiments, and any task where you want to apply or reverse a ROT13 transformation without writing code.
Use this ROT13 encoder to transform text with the classic 13-letter rotation cipher. It is useful for puzzles, learning exercises, quick obfuscation, simple text experiments, and any task where you want to apply or reverse a ROT13 transformation without writing code.
Use rot13 encoder when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
Hello
Output
Uryyb
Applies the 13-letter rotation to each alphabet character.
Input
Uryyb
Output
Hello
Running ROT13 again restores the original text.
Fix: Remember that ROT13 is only a simple text substitution and not secure protection.
Fix: ROT13 affects letters only, not punctuation or digits.
Fix: Check whether the input actually contains alphabet characters.
ROT13 is a simple letter substitution that rotates alphabet characters by 13 positions.
Yes. Applying ROT13 twice returns the original text.
No. It is a simple substitution method, not secure encryption.
Yes. It works online in the browser.
It is useful for puzzles, jokes, simple obfuscation, and learning exercises.