Encoders & Converters
ROT13 / Caesar Cipher
Encode or decode text with ROT13 or a custom Caesar shift.
❓ Frequently Asked Questions
What is the ROT13 / Caesar Cipher used for?
Apply a ROT13 or Caesar-shift cipher to text.
Is the ROT13 / Caesar Cipher free and private?
Yes — it's completely free and runs entirely in your browser. Whatever you enter stays on your device and is never uploaded to any server.
Do I need to install anything to use the ROT13 / Caesar Cipher?
No. It works in any modern web browser on desktop, tablet, or phone — no downloads, no browser extensions, and no account required.