What is the largest supported column?

Any positive integer is supported, well beyond Excel's own 16,384 column limit.

Is input case-sensitive for letters?

No, lowercase letters are automatically converted to uppercase before calculating.

What happens with invalid letters?

Non A-Z characters trigger a clear validation error.

Excel Column Name Converter

Convert between spreadsheet column numbers and letters.

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Number → Column letters

Column number

A

Column letters → Number

Column letters (e.g. A, Z, AA, XFD)

1

About the Excel Column Name Converter

Convert a column number to its Excel/Google Sheets letter name (e.g. 28 → AB) or convert column letters back to a number, both updating live as you type.

Examples

Column 28

Output

AB

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-07 · Runs entirely in your browser