ROT13 Encoder
Hide spoilers and puzzle answers in plain sight, and reveal them again with one click.
- Your data never leaves your device
- 100% free
- No sign-up
- Works offline after first load
How to encode or decode ROT13
- Type or paste text (or open a file).
- Pick the ROT variant.
- Copy the result — run it again to decode.
About ROT13
Encode or decode ROT13 instantly.
It works in your browser for speed and privacy, remembers your settings on this device, and every result can be copied, downloaded or shared.
Good for
- Hiding spoilers and puzzle answers
- Classic forum and newsgroup posts
- Teaching simple ciphers
Tip: ROT47 also scrambles numbers and punctuation, making text look less obvious.
Frequently asked questions
What is ROT13?
A letter substitution that rotates each letter 13 places (A↔N, B↔O …). Because the alphabet has 26 letters, applying it twice gives back the original text.
What are ROT5, ROT18 and ROT47?
ROT5 rotates digits, ROT18 combines ROT13 and ROT5, and ROT47 rotates all visible ASCII characters including symbols.
Is ROT13 encryption?
No — it only hides text from a casual glance (spoilers, puzzle answers). Anyone can reverse it.
Is my text uploaded?
No. Everything runs in your browser and nothing you type is sent anywhere.
How do I decode ROT13?
Run ROT13 again. Shifting by 13 letters twice brings you back to the start of the 26-letter alphabet, so encoding and decoding are the same step.