ROT13

Apply the ROT13 letter-substitution cipher (its own inverse). Done in your browser.

Runs in your browser — your file never leaves your device

Frequently asked questions

Is ROT13 free to use?

Yes — ROT13 is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.

Are my files uploaded or stored anywhere?

No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.

Do I need to install anything or create an account?

No installation and no account needed. ROT13 works on any modern browser — Windows, Mac, Linux, Android and iPhone.

How do I use ROT13?

Open the tool, add your file (or paste your content), adjust any options, then press “Apply ROT13”. Your result is ready to download in seconds.

Convert between HEX, RGB and HSL.

Generate random numbers in a range.

Convert text to and from binary.

Convert between numbers and Roman numerals.

Print 2, 4 or more PDF pages on one sheet.

Give a photo a warm vintage sepia tone.