File Size Converter
Bytes, KB, MB, GB, TB — binary or decimal.
Convert between bytes, KB, MB, GB, TB, and PB, with a choice of binary (1024-based, as your OS shows) or decimal (1000-based, as manufacturers advertise) conventions.
Frequently asked questions
Why do file sizes look different in Windows vs. the actual file?
Windows uses 1024-based (binary) units labeled as KB/MB/GB, while storage manufacturers and some tools use 1000-based (decimal) units — this converter offers both so you can match whichever context you need.
What's the difference between MB and MiB?
MB (megabyte) technically means 1,000,000 bytes (decimal), while MiB (mebibyte) means 1,048,576 bytes (binary) — but "MB" is commonly used loosely to mean either, which is the source of most confusion.