ROT13 Encoder
Apply the classic ROT13 letter substitution to text (encode and decode are the same).
ROT13 shifts every letter 13 places in the alphabet, a simple substitution long used to hide spoilers and punchlines in plain sight. Because 13 is half of 26, applying it twice returns the original — so the same tool encodes and decodes.
How to use rot13 encoder
- 1. Paste your text.
- 2. Each letter is shifted 13 places.
- 3. Copy the result (run it again to reverse).
When to use ROT13 Encoder
Hide a spoiler
Obscure a spoiler or answer so it's only readable if someone deliberately decodes it.
Lightweight obfuscation
Scramble text just enough that it isn't readable at a glance.
Learn substitution ciphers
See how a classic rotation cipher works.
Frequently asked questions
How do I decode ROT13?
Run the text through ROT13 again — applying it twice returns the original, so encode and decode are the same operation.
Is ROT13 secure?
Not at all — it offers no security, only casual obscurity. Anyone can reverse it instantly.
Is my text private?
Yes — it's processed in your browser.