ROT13 Encoder / Decoder
Apply the ROT13 cipher in real time. Encoding and decoding are the same operation.
How to Use ROT13 Encoder/Decoder
Step 1
Type or paste text into the input field.
Step 2
The ROT13 output updates in real time.
Step 3
Click Copy to copy the result to your clipboard.
Step 4
Paste ROT13 text in the input to decode it back.
Features
Real-time ROT13 transformation as you type.
Works both ways — encoding and decoding are the same.
One-click copy to clipboard.
Preserves numbers, spaces, and special characters.
Completely free with no data sent to any server.
FAQ
ROT13 (rotate by 13 places) is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. Since the English alphabet has 26 letters, applying ROT13 twice returns the original text.
No. ROT13 is not encryption and provides no security. It is a simple obfuscation technique often used to hide spoilers, punchlines, or puzzle solutions from casual reading.
No. ROT13 only transforms the 26 ASCII letters (A-Z, a-z). Numbers, punctuation, spaces, and other characters are left unchanged.
Simply apply ROT13 again. Since the alphabet has 26 letters and 13 + 13 = 26, encoding and decoding are the same operation.