Data Storage Converter
Bytes to KB, MB, GB, TB — decimal and binary.
Data Storage Converter moves between bytes, kilobytes, megabytes, gigabytes and terabytes in both decimal (1000-based) and binary (1024-based) systems, side by side. It also converts bits to bytes and shows transfer times at common connection speeds. All local arithmetic.
Loading Data Storage Converter…
Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.
How to use Data Storage Converter
- Enter a size in any unit.
- Compare the decimal and binary interpretations.
- Optionally read the estimated transfer time at a given speed.
Questions about Data Storage Converter
Why does my 1 TB drive show as 931 GB?
The manufacturer counts 1 TB as 1,000,000,000,000 bytes. Your operating system divides by 1024 three times and calls the result GB, giving 931. The bytes are all there — the two are using different definitions of the same prefix.
What are KiB, MiB and GiB?
The unambiguous binary units defined by the IEC: 1 KiB is exactly 1024 bytes. They exist precisely to end this confusion, and are shown alongside the ambiguous ones here.
Why is my 100 Mbps connection only downloading at 12 MB/s?
Because Mbps is megabits per second and MB/s is megabytes per second — eight bits to a byte. 100 Mbps is 12.5 MB/s at best, before protocol overhead.
How do I work out how long a download will take?
Enter the file size and read the transfer table, which covers 10 Mbps, 50 Mbps, 100 Mbps and 1 Gbps. Those figures are the theoretical floor at full line speed — in practice protocol overhead, the server and contention on your line add anywhere from 10% to a great deal more.
Why do macOS and Windows report different sizes for the same file?
Because they use different definitions. macOS has counted in decimal units since 10.6, so it says 500 GB where Windows, which divides by 1024, says 465 GB. Neither is wrong and the file has not changed — enter the byte count here to see both readings side by side.
Is Data Storage Converter really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use Data Storage Converter?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.