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Free Caesar Cipher

This free caesar cipher runs entirely in your browser — no signup and no file uploads. Shift letters by a chosen amount to encode or decode classic Caesar cipher messages.

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Input

Output

Result appears here…

How to use this free tool

  1. Enter plaintext or ciphertext.
  2. Set the shift amount.
  3. Encode or decode.
  4. Copy the result.

Formula

E(x) = (x + k) mod 26

Examples

  • Shift 3

    Input: ABC

    Output: DEF

Related searches

People looking for a caesar cipher often also search for caesar shift, shift cipher, decode caesar, letter shift cipher, letter shift, and free caesar cipher. This page covers that search cluster without duplicate URLs.

FAQ

What shift is ROT13?

ROT13 is Caesar with a fixed shift of 13.

Can I decode unknown shifts?

Try shifts 1–25 or use frequency intuition for puzzles.

Are spaces preserved?

Yes—non-letters usually remain unchanged.

How do I use a free caesar cipher?

This free caesar cipher runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.

What is a caesar cipher?

This free caesar cipher runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.

Is there a free online tool for caesar cipher?

This free caesar cipher runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.

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