📦 File Size Converter
Convert any file size across decimal (KB/MB/GB/TB) and binary (KiB/MiB/GiB/TiB) units at once, and see the exact byte count — handy for reconciling drive specs with what your OS reports.
🔢 Decimal & Binary, Side by Side
What is a File Size Converter?
A file size converter translates a storage figure between units, routing everything through bytes. Because two conventions coexist — decimal (÷1000) and binary (÷1024) — this tool shows both so you can match whichever your source uses.
Use it to reconcile a drive's advertised capacity with your operating system's reading, size a backup, or estimate how much a dataset will occupy.
❓ Frequently Asked Questions
What is the difference between MB and MiB?
A megabyte (MB) is a decimal unit equal to 1,000,000 bytes, while a mebibyte (MiB) is a binary unit equal to 1,048,576 bytes. Storage makers advertise in decimal MB/GB/TB, whereas many operating systems report in binary MiB/GiB but label them 'MB/GB' — which is the source of the classic 'my drive is smaller than advertised' confusion.
Why does this show two columns?
Because both conventions are in daily use. The decimal column divides by 1000 at each step (B, KB, MB, GB, TB) to match how drives and network speeds are marketed. The binary column divides by 1024 (B, KiB, MiB, GiB, TiB) to match how RAM and most file managers count. Seeing both makes the gap explicit.
Which unit should I use for a hard drive?
Drive and SSD capacities are quoted in decimal units, so a '1 TB' drive holds 1,000,000,000,000 bytes. Your operating system may then display that as roughly 931 GiB using binary counting. Both numbers are correct; they are just measuring in different bases.
Is the conversion done privately?
Yes. The value you enter is converted locally in your browser with no server round-trip, so nothing is uploaded. It is a fast, private way to sanity-check quotas, backup sizes, and transfer estimates.