Web Tools
Data Size Converter
Convert between bytes, KB, MB, GB, TB, PB and their binary IEC equivalents (KiB, MiB, GiB). Runs entirely in your browser — your data never leaves your machine.
data-size bytes converter binary storage developer-tools
Published May 28, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Enter a value and select the source unit. All conversions are displayed instantly, covering both SI (decimal, powers of 1000) and IEC (binary, powers of 1024) units.
Features
- SI units: B, KB, MB, GB, TB, PB (powers of 1000)
- IEC units: B, KiB, MiB, GiB, TiB, PiB (powers of 1024)
- Filter: show all units, SI only, or IEC only
- Copy per row: copy any individual result to clipboard
- Precise: high-precision conversion with smart formatting
- Private: runs entirely in the browser — no data transmitted
SI vs IEC Units
| SI (Decimal) | IEC (Binary) | Difference |
|---|---|---|
| 1 KB = 1,000 B | 1 KiB = 1,024 B | 2.4% |
| 1 MB = 1,000,000 B | 1 MiB = 1,048,576 B | 4.9% |
| 1 GB = 1,000,000,000 B | 1 GiB = 1,073,741,824 B | 7.4% |
| 1 TB = 10^12 B | 1 TiB = 2^40 B | 10.0% |
Use Cases
- Understanding why a “1 TB” drive shows less space in your OS
- Converting file sizes for upload limits and API payloads
- Calculating bandwidth and storage requirements
- Comparing SI and IEC unit systems side by side