Caesar Cipher — Free Online Tool

Encrypt and decrypt text with Caesar cipher using adjustable shift amount (1-25). Caesar Cipher is a free online tool from the ToolsRift Text Encoding Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

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How to use Caesar Cipher

  1. Open the Caesar Cipher above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

What is the Caesar cipher?

The Caesar cipher is one of the oldest encryption techniques. It shifts each letter by a fixed number of positions in the alphabet. Julius Caesar used a shift of 3.

How do I decrypt Caesar cipher?

Use the negative shift (or 26 minus the shift). For example, to decrypt text encrypted with shift 5, use shift 21 (or shift -5).

Can Caesar cipher be broken?

Yes, easily. There are only 25 possible shifts to try. Caesar cipher is not secure for real encryption but useful for learning cryptography.

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