File Size Converter
Convert between file size units—B, KB, MB, GB and KiB, MiB—covering both decimal (1000) and binary (1024) bases. Everything runs in your browser.
Enter a size
FAQ
What is the difference between KB and KiB?
KB is 1000 bytes (decimal) while KiB is 1024 bytes (binary). Storage vendors use decimal but operating systems often display binary, hence the mismatch.
Why does a 1TB drive show as 931GB?
Vendors define 1TB as 10¹² bytes, but the OS divides by 1024 (GiB): 10¹² bytes ≈ 931.32 GiB.
Is my input sent to a server?
No. All calculations happen entirely in your browser.
Related tools
Instantly convert length, weight, data size and temperature units.
Convert numbers between binary, octal, decimal, and hexadecimal. Handles very large integers exactly, all in your browser.
Shrink image file size by adjusting quality, with an instant before/after size comparison. Everything runs in your browser.