File Size Converter
Enter a file size and unit to see the full conversion table in both decimal (SI) and binary (IEC) units instantly.
100% client-side · no upload
Decimal (SI)
Binary (IEC)
How to use
- Enter a numeric value in the input field.
- Select the unit of that value from the dropdown (e.g. MB, GB).
- Click Convert to see the full breakdown across all units in both SI and IEC standards.
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常見問題
- Is this file size converter free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.