Instrument Serif
Instrument Serif is a serif font in 1 weight with italics. Its lowercase letters are 24% narrower than the typical serif font. Last updated 5 September 2025.
Editing a PDF that uses Instrument 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 Instrument Serif from the widths stored in your PDF, loads the complete open font, and sets your new text in Instrument Serif itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 392.2 units per 1000 em |
|---|---|
| Average capital letter width | 481 units per 1000 em |
| Word space | 170 units per 1000 em |
| Digits | proportional (digit widths differ) |
| Spacing | proportional |
| Width of i compared with m | 32% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Serif |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Instrument 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.
- Lateef Regularloosely similar widths (31.4 units)
- Markazi Text Regularloosely similar widths (35.2 units)
- Beiruti Regularloosely similar widths (35.8 units)
- Cossette Titre Regularloosely similar widths (35.8 units)
- Saira Condensed Regularloosely similar widths (36.8 units)
- Grenze Regularloosely similar widths (39 units)
- Caveat Brush Regularloosely similar widths (39.5 units)
- Ubuntu Condensed Regularloosely similar widths (39.7 units)
Compare Instrument Serif
Questions people ask
+Can I edit a PDF that uses Instrument Serif?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Instrument Serif itself, loaded from the open font, so the edit matches the rest of the page.
+Is Instrument Serif free to use?
Instrument 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 Instrument Serif?
By measured letter widths, Lateef is the closest match among open fonts (a mean difference of 31.4 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Instrument Serif support?
It includes these character sets: Latin, Central European.
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