ROT13 Cipher
Apply the ROT13 letter-rotation cipher — its own inverse.
How to Use
- Type text — the rotated version appears instantly.
- Apply ROT13 again to decode (it's symmetric).
Variants
About the ROT13 Cipher
Use the ROT13 Cipher — a free, easy tool for text, encoding and string work. Nothing is uploaded, and you do not need an account. Apply the ROT13 letter-rotation cipher — its own inverse.
How it works
Enter a number and choose your units — the converted value shows instantly. Everything runs locally, so nothing you type leaves your device. Double-check the direction of the conversion and you are set.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
Is this secure?
No — ROT13 is obfuscation, not encryption. Letters shift by 13 so applying it twice returns the original.
How do I use the ROT13 Cipher?
Simply type or paste your value and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Do I need to install or sign up for anything?
Not at all — it runs in the browser with nothing to install and no account. After it loads once, it even works without an internet connection.
Is my information private?
Yes. Everything happens in your browser. Nothing you type is sent to a server or saved anywhere.
Common Use Cases
Spoiler hiding
Classic Usenet convention for spoilers.
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