Text & Writing
Caesar cipher
Encrypt/decrypt by shift + brute force.
- Instant
- Free
- Private (processed locally)
- No sign-up
Encrypt and decrypt
Enter your text and a shift (0–25): the result shows live. Open brute force to see all 25 shifts.
Example
| Text | Shift | Result |
|---|---|---|
| HELLO | +3 | KHOOR |
| KHOOR | −3 (23) | HELLO |
| HELLO | +13 (ROT13) | URYYB |
Educational tool, 100% local calculation.
Frequently asked questions
How to decrypt a message?
Apply the reverse shift: if encrypted with +3, decrypt with −3 (i.e. 23).
What is ROT13?
It is the Caesar cipher with a shift of 13: applied twice it returns the original text.
Is it secure?
No, it is trivial to break (25 tries). It is an educational tool, not real security.