ROT13 Encoder/Decoder Online - Free ROT13 encoder and decoder.
Free online ROT13 encoder/decoder. ROT13 shifts each letter 13 positions. Encode and decode are identical. Also supports ROT5 for digits.
ROT13 replaces each letter with the 13th letter after it. Encode and decode are the same operation.
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ROT13 is NOT encryption. It is a simple letter substitution used for obscuring text (e.g., spoilers).
How to Use ROT13 Encoder/Decoder
- 1Paste your text into the input area.
- 2ROT13 is applied instantly — encode and decode are the same.
- 3Toggle ROT5 to also shift digits (0-4 ↔ 5-9).
- 4Use Swap to apply ROT13 again on the output.
Frequently Asked Questions
Is ROT13 encryption?
No. ROT13 is NOT encryption. It is a simple letter substitution cipher used for obscuring text (e.g., hiding spoilers). Anyone can decode it — it provides no security.
What is ROT5?
ROT5 is the numeric equivalent of ROT13. It shifts each digit by 5: 0-4 become 5-9 and vice versa. It can be combined with ROT13 to also obscure numbers.
Why would I use ROT13?
ROT13 is commonly used to obscure spoilers, puzzle answers, or off-topic content in forums. It is also used in some email systems to obscure potentially offensive content.
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