Caesar Cipher

Encrypt/decrypt with Caesar cipher

How to use

1. Enter your text.
2. Choose a shift amount (the classic Caesar shift is 3).
3. See the encoded or decoded result instantly.

Why use this tool

• Encode & decode: Shift letters forward or backward by any amount.
• Learn & play: Great for puzzles, teaching, and understanding basic ciphers.
• 100% private: Everything runs in your browser. Your data is never uploaded to a server, so it's safe for confidential content.

Frequently asked questions

Is the Caesar cipher secure?

No. It's one of the oldest and weakest ciphers — fun for puzzles and learning, but never use it to protect real secrets.

How do I decode a Caesar cipher?

Shift the letters back by the same amount used to encode. If you don't know the shift, try all 25 — it's trivial to break.

Is my text private?

Yes. Everything runs in your browser.

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