ROT13 Encoder
Apply ROT13 to any text. Applying ROT13 twice restores the original.
ROT13 encode / decode tool
Convert text with ROT13
ROT13 uses the same operation for encoding and decoding. Applying it twice returns the original text.
Paste text here, for example: Hello BlinkCalc
ROT13 is reversible obfuscation, not encryption. Do not use it for passwords, secrets, API keys, or private data.
ROT13 output
Output is plain text and easy to copy.
Conversion status
Converted
ROT13 output is ready to copy. Numbers, punctuation, spaces, emojis, and non-Latin characters are preserved.
Status
Converted
ROT13 output is ready to copy. Numbers, punctuation, spaces, emojis, and non-Latin characters are preserved.
Input length
15
Characters in the input.
Output length
15
Characters in the ROT13 output.
Letters transformed
14
English A–Z and a–z letters rotated.
Characters preserved
1
Numbers, punctuation, spaces, emojis, and non-Latin characters.
Operation
ROT13 encode/decode
The same operation encodes and decodes.
Security level
Obfuscation only
ROT13 is not encryption.
Copy ROT13 output
Copy the converted text for puzzles, examples, spoilers, or documentation.
Swap output to input
Move the ROT13 output back into the input box to decode it again.
Copy original input
Copy the source text before transformation for comparison.
Privacy note
ROT13 conversion is designed to run locally in your browser without storing user input.
Accuracy note
Only English alphabet letters A–Z and a–z are rotated. Other characters are preserved.
Security note
ROT13 is instantly reversible and should not be used for secrets or sensitive information.
Practical ROT13 examples
Click an example to populate the encoder instantly.
ROT13 quick reference
A ↔ N
Uppercase A rotates to N and back again.
B ↔ O
Uppercase B rotates to O.
C ↔ P
Uppercase C rotates to P.
M ↔ Z
Uppercase M rotates to Z.
a ↔ n
Lowercase a rotates to n.
m ↔ z
Lowercase m rotates to z.
Symmetric
The same operation encodes and decodes.
Unchanged characters
Numbers, punctuation, spaces, emojis, and non-Latin characters are preserved.
ROT13 twice
Applying ROT13 twice restores the original text.
Text utility guide
Understand ROT13 encoding and decoding
ROT13 is a simple substitution cipher that rotates English alphabet letters by 13 positions. Since the alphabet has 26 letters, applying ROT13 twice restores the original text.
What is ROT13?
ROT13 is a simple letter substitution method that shifts each English alphabet letter by 13 positions. A becomes N, B becomes O, and N becomes A.
When should users use ROT13?
Use ROT13 for simple text obfuscation, spoiler hiding, puzzles, games, learning substitution ciphers, testing text transformation logic, and lightweight documentation examples.
ROT13 encode vs decode
ROT13 uses the same operation for encoding and decoding. Applying the tool again to ROT13 output returns the original text.
ROT13 vs encryption
ROT13 is not encryption. It has no secret key and can be reversed instantly by anyone. Do not use it for passwords, secrets, API keys, or private messages.
Privacy and security
BlinkCalc is designed to process ROT13 text locally in the browser. ROT13 output should still be treated as easily reversible.
Common ROT13 mistakes
How to use this ROT13 Encoder
- 1Paste or type text into the input box.
- 2Review the ROT13 output instantly or click Convert.
- 3Copy the converted text if needed.
- 4Use Swap or paste the output again to decode it back.
- 5Avoid using ROT13 for sensitive or private information.
Why developers use a ROT13 Encoder
ROT13 Encoder FAQs
It shifts each English alphabet letter by 13 positions, turning A into N, B into O, and so on.
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