Is it safe to use the Data Size Converter online?

Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.

Are my files uploaded to a server?

No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.

Do I need to sign up or pay?

No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.

Why does my hard drive show less than advertised?

Drive makers use SI (1 TB = 10^12 B); operating systems often display IEC (1 TiB = 2^40 B = 1.0995× more). The bytes are the same — only the label differs.

Is 1 Mbps the same as 1 MB/s?

No. 1 Mbps (megabit per second) = 0.125 MB/s. ISPs advertise in bits, downloads measure in bytes.

Data Size Converter

Convert between byte, kilobyte, megabyte, gigabyte, terabyte, petabyte — and their binary cousins kibibyte (KiB), mebibyte (MiB), etc. The decimal/binary discrepancy is shown side-by-side so you can pick the right one.

Features

Both SI (decimal, 1 KB = 1000 B) and IEC (binary, 1 KiB = 1024 B) shown
Bits and bytes both available — useful for network speeds
Live multi-unit grid
Tooltip explains the discrepancy on hover
Copy any value

How to data size converter

Type a value — Pick the unit and enter a number.
Compare SI vs IEC — 1 GB (decimal) ≠ 1 GiB (binary) — choose carefully.

Frequently asked questions

Is it safe to use the Data Size Converter online?: Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.
Are my files uploaded to a server?: No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.
Do I need to sign up or pay?: No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.
Why does my hard drive show less than advertised?: Drive makers use SI (1 TB = 10^12 B); operating systems often display IEC (1 TiB = 2^40 B = 1.0995× more). The bytes are the same — only the label differs.
Is 1 Mbps the same as 1 MB/s?: No. 1 Mbps (megabit per second) = 0.125 MB/s. ISPs advertise in bits, downloads measure in bytes.