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IBM Plex Sans

IBM Plex Sans is a sans serif font in 7 weights with italics, also available as a variable font. Its lowercase letters are 3% narrower than the typical sans serif font. Last updated 8 September 2025.

IBM Plex Sans: The quick brown fox jumps over the lazy dog 0123456789
IBM Plex Sans Regular
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Editing a PDF that uses IBM Plex Sans

Most PDFs embed only the letters they already use. Type a new letter and many editors either refuse or swap in a different font. MythosPDF recognises IBM Plex Sans from the widths stored in your PDF, loads the complete open font, and sets your new text in IBM Plex Sans itself. The rest of the page is carried over untouched.

Measured metrics

Average lowercase letter width505 units per 1000 em
Average capital letter width633.6 units per 1000 em
Word space236 units per 1000 em
Digitstabular (every digit is 600 units wide, so columns of numbers line up)
Spacingproportional
Width of i compared with m29%
Printable ASCII characters covered94 of 94
CategorySans serif

Weights and styles

Languages beyond basic Latin

Open fonts closest to IBM Plex Sans

Measured on every printable character both fonts contain. A smaller difference means the same words take the same space, so lines break in the same places.

  1. IBM Plex Sans KR Regularidentical letter widths (0 units)
  2. IBM Plex Sans Thai Looped Regularidentical letter widths (0 units)
  3. IBM Plex Sans Arabic Regularidentical letter widths (0 units)
  4. IBM Plex Sans Thai Regularidentical letter widths (0 units)
  5. IBM Plex Sans Devanagari Regularidentical letter widths (0 units)
  6. IBM Plex Sans Hebrew Regularidentical letter widths (0 units)
  7. Anuphan Regularidentical letter widths (0 units)
  8. IBM Plex Sans JP Regularsimilar widths (18.2 units)

Compare IBM Plex Sans

Questions people ask

+Can I edit a PDF that uses IBM Plex Sans?

Yes. Drop the PDF into MythosPDF and click the text. New letters are set in IBM Plex Sans itself, loaded from the open font, so the edit matches the rest of the page.

+Is IBM Plex Sans free to use?

IBM Plex Sans is released under the SIL Open Font License 1.1, an open licence that allows free use in documents, including commercial ones. Check the licence text for your exact use.

+Which font is closest to IBM Plex Sans?

By measured letter widths, IBM Plex Sans KR is the closest match among open fonts (a mean difference of 0 units per 1000 em). Text set in one takes almost the same space in the other.

+Which languages does IBM Plex Sans support?

It includes these character sets: Cyrillic, Cyrillic Extended, Greek, Latin, Central European, Vietnamese.

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