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What units (KB, MB, GB...) does this support?

About sindresorhus/pretty-bytes · 2 messages · last activity 7/20/2026

Question

What units (KB, MB, GB...) does this support?

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The library supports multiple unit systems depending on the options you use:

For bytes (default): B, kB, MB, GB, TB, PB, EB, ZB, YB [index.js:L1-L10]

For binary bytes (when binary: true): B, KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB [index.js:L12-L20]

For bits (when bits: true): b, kbit, Mbit, Gbit, Tbit, Pbit, Ebit, Zbit, Ybit [index.js:L22-L30]

For binary bits (when bits: true and binary: true): b, kibit, Mibit, Gibit, Tibit, Pibit, Eibit, Zibit, Yibit [index.js:L32-L40]

The key difference is that the default uses SI prefixes (base-10, dividing by 1000), while the binary option uses binary prefixes (base-2, dividing by 1024). The bits option switches between byte and bit units.

FOLLOW_UPS:

  • What's the difference between SI and binary prefixes?
  • How does the library choose which unit to display?
  • Can you use bits and binary together?

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