ROT13 Encoder / Decoder — Free Online Tool

Apply the classic ROT13 letter-shift cipher to hide or reveal text. Because ROT13 is its own reverse, the same button encodes and decodes.

Save this tool Keep it in your list and reopen your work later — no sign-up, nothing uploaded.

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How to use ROT13 Encoder / Decoder

Paste your text.
Click Convert.
Copy the shifted text.

Frequently asked questions

Is ROT13 secure?

No — it is a fun obfuscation, not real encryption. Do not use it for secrets.

Your privacy is protected

This tool runs entirely inside your browser. No file, text or number you enter is ever sent to our servers, stored, or shared. Close the tab and everything is gone.

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