File Size Converter
Convert between decimal (KB/MB/GB) and binary (KiB/MiB/GiB) file sizes.
Decimal (SI)
B
KB
MB
GB
TB
Binary (IEC)
KiB
MiB
GiB
TiB
About the File Size Converter
This tool converts between digital storage units: bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. It supports both decimal (SI) units (1 KB = 1,000 bytes) and binary (IEC) units (1 KiB = 1,024 bytes), which are the two standards used in different contexts.
Useful for comparing file sizes, understanding storage specifications, calculating how many files will fit on a drive, and translating between the units that operating systems and hardware manufacturers use. Operating systems often report in binary units while manufacturers advertise in decimal units — this converter makes the difference clear.