Human-readable File Size Formatter

Format and parse byte counts across four standards: SI (kB), IEC (KiB), JEDEC (KB), and Windows. Round-trip, batch mode, locale-aware. Live, in your browser.

Direction

Format (bytes → human) Parse (human → bytes) Batch (one per line)

Byte count

— Clear

Decimals Locale 1,000.50 (en-US) 1.000,50 (de-DE) 1 000,50 (fr-FR) No separators (1500.50)

IEC (canonical) Copy

—

System	Output	Unit	In bytes
SI	—	1,000 B	—
IEC	—	1,024 B	—
JEDEC	—	1,024 B	—
Windows	—	1,024 B	—