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File Size Converter

Convert a file size between decimal (SI) and binary (IEC) units instantly.

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About the File Size Converter

The File Size Converter shows a size in every decimal unit (KB, MB, GB, TB, based on 1,000) and every binary unit (KiB, MiB, GiB, TiB, based on 1,024) at once.

The difference explains why a "1 TB" drive shows about 931 GiB in your operating system. Everything runs in your browser with JavaScript. Nothing you type is uploaded to our server, so it is safe to use with private data.

How to use it

  1. Enter a size.
  2. Choose its unit.
  3. Select Convert size and read all equivalents.

Common uses

  • Checking whether a file fits under an upload limit.
  • Understanding storage capacity on drives and phones.
  • Converting sizes reported by different programs.

Tips

  • Storage makers usually use decimal units; Windows reports binary units with decimal names.
  • Network speeds are in bits, not bytes; divide by 8 to get bytes.