Encoding & Number Bases
Caesar Cipher
Encrypt and decrypt text with the Caesar shift cipher, or brute-force all 25 shifts.
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What is Caesar Cipher?
The Caesar cipher shifts each letter by a fixed number of positions in the alphabet. Julius Caesar reportedly used it for military correspondence; with only 25 possible keys it is trivially breakable, which is why the brute-force view is built in.
How it works
Each letter's char code is offset by the shift modulo 26, preserving case; non-letters pass through unchanged. Brute-force mode decrypts the input with every shift from 1 to 25.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
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