Question
What units (KB, MB, GB...) does this support?
What units (KB, MB, GB...) does this support?
About sindresorhus/pretty-bytes · 2 messages · last activity 7/27/2026
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The library supports multiple unit systems depending on the options you use:
Standard (base-10) byte units [index.js:L1-L9]:
- B, kB, MB, GB, TB, PB, EB, ZB, YB
Binary byte units (when binary: true) [index.js:L12-L20]:
- B, KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB
Standard (base-10) bit units (when bits: true) [index.js:L23-L31]:
- b, kbit, Mbit, Gbit, Tbit, Pbit, Ebit, Zbit, Ybit
Binary bit units (when bits: true, binary: true) [index.js:L34-L42]:
- b, kibit, Mibit, Gibit, Tibit, Pibit, Eibit, Zibit, Yibit
By default, the library uses base-10 byte units (B through YB). The choice of unit system is determined automatically based on the input value and the selected options—the library will use the most appropriate unit to keep the number readable (typically scaled to 3 significant figures).
FOLLOW_UPS:
- How does the library choose which unit to display?
- What's the difference between binary and standard units?
- Can I format numbers less than 1 byte?
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