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ROT13 Encoder/Decoder

Encoding Tools

Encode and decode text using ROT13 cipher. Free, private — all processing in your browser.

ROT13 is its own inverse — encoding and decoding use the same operation.

Input

ROT13 Output

How to use

1. Enter or paste your data in the input area above
2. Adjust settings or options as needed
3. Click the action button or see real-time results
4. Copy the result with the copy button

All processing happens in your browser. Nothing is sent to any server.

About this tool

Apply ROT13 substitution cipher to text. ROT13 replaces each letter with the letter 13 positions after it in the alphabet (A→N, B→O, ..., N→A). Since the alphabet has 26 letters, applying ROT13 twice returns the original text — encoding and decoding use the same operation. ROT13 is not encryption (it provides no security), but is used for hiding spoilers, puzzle answers, and mildly obscuring text in online forums. Numbers, spaces, and punctuation are not affected.