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 5/25/2026
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The pretty-bytes library supports multiple unit systems depending on the options you use:
Standard SI Units (bytes) — used by default:
B, kB, MB, GB, TB, PB, EB, ZB, YB [index.js:L1-L10]
Binary Units (bytes) — when binary: true option is set:
B, KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB [index.js:L12-L20]
Bit Units (standard SI) — when bits: true option is set:
b, kbit, Mbit, Gbit, Tbit, Pbit, Ebit, Zbit, Ybit [index.js:L22-L30]
Binary Bit Units — when both bits: true and binary: true options are set:
b, kibit, Mibit, Gibit, Tibit, Pibit, Eibit, Zibit, Yibit [index.js:L32-L40]
The library goes up to Yottabyte/Yottalogical units, which is the largest standardized unit. The appropriate unit is automatically selected based on the magnitude of the number being formatted [index.js:L144-L146].
FOLLOW_UPS:
- How does the library choose which unit to display?
- Can you customize the decimal precision of output?
- Does it support localized number formatting?
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