ROT13 Encoder/Decoder
Apply ROT13 cipher to text. Shifts each letter by 13 positions. Same operation encodes and decodes.
How to Use ROT13 Encoder/Decoder
The ROT13 Encoder/Decoder is a free online tool that applies the ROT13 substitution cipher to your text. ROT13 shifts each letter by 13 positions in the alphabet, making it a simple way to obscure text. Since the alphabet has 26 letters, applying ROT13 twice returns the original text — the same operation both encodes and decodes. Whether you are hiding spoilers in online forums, creating simple text puzzles, learning about basic cryptography, or decoding ROT13-encoded content you found online, this tool provides instant results as you type. Non-alphabetic characters (numbers, punctuation, spaces) are preserved unchanged.
Step-by-Step Instructions
- Enter or paste text to encode or decode
- View the ROT13 result updating in real-time
- Apply ROT13 again to the output to get back the original
- Copy the result using the copy button
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