File Size Converter

Convert a positive file size between decimal units such as MB and GB and binary units such as MiB and GiB. All calculations happen in your browser.

How to use File Size Converter

1. Enter a positive number.
2. Select the unit that describes the starting size.
3. Read the converted values in the result table.

A useful example

1 GB equals 1,000,000,000 bytes. 1 GiB equals 1,073,741,824 bytes.

Limits and assumptions

Values larger than JavaScript can represent precisely are rejected. Displayed decimals are rounded; the underlying conversion uses the stated unit factors.

Frequently asked questions

Are MB and MiB interchangeable?

No. An MB contains one million bytes. An MiB contains 1,048,576 bytes.

Does this resize a file?

No. It converts a numerical measurement. It does not change, compress or upload a file.

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