ROT13 Encoder / Decoder
Encoders & Ciphers
100% in-browser
Apply the ROT13 letter-substitution cipher — the same action encodes and decodes.
How to use the ROT13 Encoder / Decoder
- 1 Type or paste your text.
- 2 The ROT13 result appears instantly.
- 3 Run it again on the result to decode.
About the ROT13 Encoder / Decoder
ROT13 rotates each letter 13 places through the alphabet. Because the alphabet has 26 letters, applying it twice returns the original — so the same tool encodes and decodes. It is used to hide spoilers and puzzle answers, not for security.
The transformation happens entirely in your browser.
Frequently asked questions
How do I decode ROT13?
Apply ROT13 again — it is its own inverse.
Is ROT13 secure?
No, it is a simple obfuscation, not encryption.
Related tools
More from us
