Shift the letters with a numeric key

For a technical exchange, a coding lesson or a conversion check, this gives learners and developers a readable result. Shift the letters with a numeric key.

Shift the letters with a numeric key. The result appears instantly in your browser, ready to copy, with no account, upload or storage involved.

How to use

Enter the shift key, a whole number between minus twenty-five and twenty-five.
Provide the text to transform in the designated field, keeping uppercase and lowercase letters.
Choose whether to encode, decode or transform according to your need.
Click the transform button to get the shifted text in the result.
Copy the result and check that the shift matches the key you used.

Example

The sample input uses a positive key and a short message. After transforming, the result shows the text with shifted letters. You can compare the original message and the result to understand the effect of the shift.

Input

3
Hello world

Output

Khoor zruog

Limits and formats

The Caesar cipher is a classic encoding, not a way to secure sensitive data.
Only alphabet letters are shifted; digits, spaces and punctuation remain unchanged.
The key must be a whole number within the allowed range.
A very long text can be hard to verify manually.

Where processing happens

Letter shifting is calculated in your browser. The text you enter does not leave your device and is not stored. No data is sent outside.

Frequently asked questions

What is the difference between encoding and decoding?

Encoding applies a shift to each letter. Decoding applies the opposite shift to recover the original text. If you know the key, you can switch between the two.

Are accents and special characters shifted?

No, the tool shifts unaccented alphabet letters. Accents, digits, spaces and punctuation marks are not changed. This can make the encoded text less uniform if the original contains accented characters.

Can I use a negative key?

Yes, the allowed range goes from minus twenty-five to twenty-five. A negative key shifts letters backwards in the alphabet. The result remains consistent as long as you use the same key for encoding and decoding.