Libertinus Serif
Libertinus Serif is a serif font in 3 weights with italics. Its lowercase letters are 10% narrower than the typical serif font. Last updated 30 July 2025.
Editing a PDF that uses Libertinus Serif
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 Libertinus Serif from the widths stored in your PDF, loads the complete open font, and sets your new text in Libertinus Serif itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 466.8 units per 1000 em |
|---|---|
| Average capital letter width | 620.2 units per 1000 em |
| Word space | 250 units per 1000 em |
| Digits | tabular (every digit is 465 units wide, so columns of numbers line up) |
| Spacing | proportional |
| Width of i compared with m | 34% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Serif |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Libertinus Serif
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.
- Libertinus Serif Display Regularvery close widths (10.6 units)
- Libertinus Sans Regularvery close widths (14.8 units)
- Libertinus Math Regularsimilar widths (15 units)
- Sahitya Regularsimilar widths (28.4 units)
- Alegreya Regularsimilar widths (28.7 units)
- Crimson Text Regularloosely similar widths (30 units)
- Lisu Bosa Regularloosely similar widths (31 units)
- Triodion Regularloosely similar widths (31.6 units)
Compare Libertinus Serif
Questions people ask
+Can I edit a PDF that uses Libertinus Serif?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Libertinus Serif itself, loaded from the open font, so the edit matches the rest of the page.
+Is Libertinus Serif free to use?
Libertinus Serif 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 Libertinus Serif?
By measured letter widths, Libertinus Serif Display is the closest match among open fonts (a mean difference of 10.6 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Libertinus Serif support?
It includes these character sets: Cyrillic, Cyrillic Extended, Greek, Greek Extended, Hebrew, Latin, Central European, Vietnamese.
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