Free tools
English
Caesar cipher converter
Encode or decode English letters with a chosen alphabet shift. Use it in your browser, with no account required.
No account needed
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How to use
- 1Enter your values and choose the options.
- 2Run the tool and review the result.
- 3Copy the result or save it as a file.
Good to know
Only English A–Z letters are transformed; other characters are preserved.
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Worked input and output example
These results come from this tool’s actual engine using the sample values below, not your personal input or saved work. Load the example in the tool to inspect the same inputs.
Example input
| Field | Value |
|---|---|
| Text | Hello, world! |
| Alphabet shift | 3 |
| Mode | Encode |
Example result
Khoor, zruog!
Input constraints
These are the actual input validation limits; they are not a guarantee that every accepted value is realistic or that a model applies to your situation.
- Alphabet shift: Accepted range: -25 ≤ x ≤ 25 · Whole numbers only
- Mode: Available options: Encode / Decode