Spline Sans
Spline Sans is a sans serif font in 5 weights, also available as a variable font. Its lowercase letters are about as wide as the typical sans serif font. Last updated 10 September 2025.
Editing a PDF that uses Spline 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 Spline Sans from the widths stored in your PDF, loads the complete open font, and sets your new text in Spline Sans itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 521.4 units per 1000 em |
|---|---|
| Average capital letter width | 632.5 units per 1000 em |
| Word space | 180 units per 1000 em |
| Digits | proportional (digit widths differ) |
| Spacing | proportional |
| Width of i compared with m | 31% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Sans serif |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Spline 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.
- Radio Canada Big Regularsimilar widths (25.5 units)
- Averia Libre Regularsimilar widths (28.8 units)
- Averia Sans Libre Regularsimilar widths (28.9 units)
- Murecho Regularsimilar widths (29.2 units)
- Inter Tight Regularsimilar widths (29.2 units)
- Averia Gruesa Libre Regularloosely similar widths (30.4 units)
- Ubuntu Sans Regularloosely similar widths (30.5 units)
- Ubuntu Regularloosely similar widths (30.5 units)
Compare Spline Sans
Questions people ask
+Can I edit a PDF that uses Spline Sans?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Spline Sans itself, loaded from the open font, so the edit matches the rest of the page.
+Is Spline Sans free to use?
Spline 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 Spline Sans?
By measured letter widths, Radio Canada Big is the closest match among open fonts (a mean difference of 25.5 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Spline Sans support?
It includes these character sets: Latin, Central European.
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