File Size Converter & Visualizer: Binary & Decimal

Decimal uses powers of 1000 (KB, MB, GB), while binary uses powers of 1024 (KiB, MiB, GiB). This is why a "1GB" drive appears smaller in your computer-manufacturers use decimal, but operating systems use binary.

Absolutely. All calculations happen entirely in your browser using JavaScript. No data is sent to our servers. Your files and values never leave your computer.

Yes! You can drag and drop a file directly into the input area, and the tool will automatically read its size and populate the converter. The file itself is never uploaded-only its size is used locally.

External drives are marketed using decimal (1TB = 1,000,000,000,000 bytes), but your operating system displays them in binary (1TiB = 1,099,511,627,776 bytes). This tool helps you understand both perspectives.

The calculation is based on ideal network speeds. Real-world speeds vary due to network congestion, distance, and hardware. Use these as rough estimates, not guarantees.