Caesar Cipher Encoder/Decoder
Encode or decode text with a Caesar cipher using any shift value.
How to use Caesar Cipher Encoder/Decoder
- 1Type your text and choose a shift amount (1–25).
- 2Click Encode to shift letters forward, or Decode to shift back.
Why use this tool
- Supports any shift value, unlike fixed ROT13.
- Non-letter characters are left unchanged.
Frequently asked questions
What shift does ROT13 use?
ROT13 is a Caesar cipher with a fixed shift of 13 — this tool lets you use any shift from 1 to 25.