ROT13 Encoder
Encode and decode ROT13 text — shift each letter 13 places, the classic simple cipher — free, fast and private.
Your result will appear here.
How to use ROT13 Encoder
- Type or paste your text.
- Click Encode / Decode — ROT13 is its own reverse, so the same button does both.
- Copy the result.
- Run encoded text through again to get the original back.
Note: ROT13 is a toy cipher for fun and puzzles, not real security — anyone can decode it instantly.
Frequently Asked Questions
Is the ROT13 Encoder free?
Yes, it is 100% free with no sign-up. Your files and data stay in your browser.
Is ROT13 encryption secure?
No. It is a puzzle cipher, not security — never use it to hide real secrets.
Is my file uploaded to a server?
No. This tool runs entirely in your browser — your file is never uploaded.
Why does the same button decode too?
Shifting 13 places twice is 26 places, a full alphabet — so ROT13 is its own inverse.