Developer tool
ROT13 Encoder & Decoder
Encode and decode English letters with ROT13 while preserving all other characters locally.
Processed in your browser unless a tool explicitly says otherwise.
Use the toolNo account required
ROT13 changes English A–Z and a–z only. Numbers, punctuation, whitespace, and Unicode characters stay unchanged.
ROT13 is self-inverse: applying it twice restores the original text. All processing happens locally in your browser.
How it works
A reversible letter rotation.
ROT13 rotates English alphabetic letters by 13 positions. Applying it twice returns the original text, while Unicode and non-alphabetic characters remain unchanged.
Privacy note
Your input is processed locally and is never uploaded.