Caesar Cipher
Encoders & Ciphers
100% in-browser
Shift letters by any amount to encode or decode a Caesar cipher.
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How to use the Caesar Cipher
- 1 Type or paste your text.
- 2 Drag the shift slider to encode; use the same value the other way to decode.
- 3 Copy the result, or scan all 25 shifts to crack an unknown one.
About the Caesar Cipher
The Caesar cipher shifts every letter a fixed number of places through the alphabet — the oldest known substitution cipher. A shift of 13 is the same as ROT13.
This tool shifts by any amount and can show every possible shift at once, making it easy to break a cipher when you do not know the key. It runs entirely in your browser.
Frequently asked questions
How do I decode without the shift?
Use the show-all-shifts view to see all 25 possibilities and pick the readable one.
Does it keep punctuation?
Yes, only letters are shifted; numbers, spaces and punctuation stay unchanged.
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