File Size Converter
Convert a file size across bytes, KB, MB, GB, TB and PB (decimal/SI) and the binary KiB, MiB, GiB, TiB and PiB (IEC) units — all at once. The two systems differ by their base:
Decimal: 1 KB = 1000 bytes · Binary: 1 KiB = 1024 bytes
That gap is why a drive sold as 1 TB (1,000,000,000,000 bytes) shows up as roughly 931 GiB in your operating system. This tool computes the raw byte count once and expresses it in every unit in both systems, so you can compare a vendor’s figure with what your OS reports. Everything is calculated locally in your browser — nothing is sent anywhere.