🔠Caesar Cipher / ROT
Encrypt and decrypt text with Caesar cipher. ROT13/ROT47 presets and custom 1–25 rotation. Useful for CTF challenges, hiding spoilers on forums, introductory cryptography study, and fun message encoding.
How to use
- 1Enter your text.
- 2Choose rotation (13 means ROT13).
- 3Encrypted result appears instantly.
FAQ
Can I use this for real security?+
Caesar is a trivially broken cipher — use only for jokes, quizzes, and games. Real security needs modern crypto like AES or RSA.
What is ROT13?+
A 13-position Caesar cipher. It's its own inverse — applying twice returns the original. Common for hiding spoilers on forums.
What about ROT47?+
Rotates ASCII 33–126 (letters, numbers, symbols) by 47. Unlike ROT13 (letters only), it covers almost all printable characters.
What if I don't know the rotation?+
Use the ROT All tool to see all rotations 1–25 at once. Handy for CTF and puzzles.
Does Caesar work for Korean?+
Korean has 24 jamo, so Caesar isn't well-defined. This tool focuses on English letters and numbers.
Who invented this?+
Named after Julius Caesar, who used a 3-position rotation for military messages in ancient Rome.