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Byte Size Converter

Convert between bytes, KB, MB, GB and their binary equivalents.

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Questions
What is the difference between KB and KiB?
A kilobyte (KB) is 1,000 bytes; a kibibyte (KiB) is 1,024. The gap compounds: a terabyte is about 10% smaller than a tebibyte. Drive manufacturers sell in decimal units while operating systems often report binary ones, which is exactly why a "1 TB" drive shows as roughly 931 GB.
Which convention should I use?
Decimal units for storage, transfer and anything user-facing; binary units for memory, where hardware addressing genuinely works in powers of two. Whichever you pick, label it explicitly.