ROT13 Cipher
Apply ROT13 substitution cipher to encode or decode text instantly in your browser.
ROT13 has a neat property most substitution ciphers don't: applying it twice returns the exact original text, since shifting every letter forward by thirteen places and then doing it again moves each letter a full twenty-six places, all the way around the alphabet back to where it started, which is why the same operation both encodes and decodes with no separate reverse step needed. This tool applies ROT13 to text instantly, useful for the format's actual common purpose, obscuring a spoiler or a punchline in a forum post so it's not immediately visible but can be decoded on purpose by anyone who wants to read it, not real security in any meaningful sense.
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Useful for hiding a spoiler in a post so readers can choose whether to reveal it, decoding a ROT13-obscured message back into plain text, or applying the same operation either direction since encoding and decoding are identical.
Key features
- Clean interface
- Fast processing
- No signup required
- Works offline