Free Cipher Tool - ROT13, Caesar, Atbash
Encode or decode text using classic ciphers. ROT13 shifts letters by 13 positions, Caesar shift uses a custom offset, and Atbash reverses the alphabet (A→Z, B→Y, etc.). Perfect for puzzles, learning cryptography basics, and quick text obfuscation. All processing happens locally.
How to Use
- Choose a cipher type
- Select Encode or Decode
- Paste your text and click Convert
Privacy
All processing happens locally. No data is transmitted.
Last reviewed: July 2026.