The data size works like this: it converts data sizes with both decimal (kB = 1000 B) and binary (KiB = 1024 B) interpretations, showing where the two diverge. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the Data Size
Enter or paste the source value.
Confirm the source and target units or formats.
Read the converted result, which updates live as you type.
Copy the output when you are happy with it.
Features
Convert bytes to KB, MB, GB, TB file size units
Instant result, no page reload
Works in any modern browser, desktop or mobile
Free with no signup
Common mistakes to avoid
Selecting a near-neighbor unit instead of the intended one
Forgetting whether a value is a rate or a total
Examples
Input
Result
1 GB (decimal)
1,000,000 kB · 953.674 MiB · 0.931 GiB
Best used for
Getting a reliable answer for data size without installing an app
One-off tasks done in under a minute from any device
Checking results before committing them to something important
Working on a phone where desktop software is unavailable
Privacy
Conversion runs locally in your browser tab.
Frequently asked questions
Why does my "1 TB" drive show 931 GB?
Drives are labelled in decimal bytes; operating systems display binary gibibytes. Same bytes, different divisor - this tool shows both.
When does kB mean 1000 vs 1024?
Strictly, kB is 1,000 bytes and KiB is 1,024 - but software labels are inconsistent. The converter computes both readings from the same input so you can see the discrepancy it causes.