File Size Converter Online

ZeroKB’s File Size Converter converts between Bytes, Kilobytes (KB), Megabytes (MB), Gigabytes (GB), Terabytes (TB), and Petabytes (PB). Enter a value, choose its current unit, and select the unit you need. The result updates automatically. Use the swap button to reverse the units, or select a quick conversion card to fill in a common pair.

How to Convert File Sizes

1. Enter a value

Type a non-negative number in the file size field. Decimal values are supported, so you can convert sizes such as 1.5 MB.

2. Select the units

Choose the unit of your entered value and the target unit. For example, choose KB as the source and MB as the target to convert Kilobytes to Megabytes.

3. Choose a conversion system

Binary mode uses a factor of 1,024 between units. Decimal mode uses a factor of 1,000. The result and quick conversions recalculate when you change the system.

4. Copy or reset

Use Copy Result to copy the conversion equation. Reset clears the current value and restores the default unit selections.

Binary and Decimal Units

Computer memory and many operating systems commonly use binary steps of 1,024. For example, 1 MB is 1,024 KB in Binary mode. Storage manufacturers and some network or data specifications use decimal steps of 1,000, where 1 MB is 1,000 KB. Because the systems differ, the same numeric size can produce different displayed results. Check which convention your device, service, or specification uses.

Common File Size Conversions

Converting KB to MB can help compare document or image sizes. MB to GB is useful for larger downloads and storage estimates. GB and TB conversions help describe drive capacity and backups. This converter supports all common unit pairs, including conversions to and from Bytes and PB. Very small results may be shown with extra decimal places or scientific notation so the value remains readable.

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Frequently Asked Questions