Mozilla Headline
Mozilla Headline is a sans serif font in 6 weights, also available as a variable font. Its lowercase letters are 4% wider than the typical sans serif font. Last updated 30 July 2025.
Editing a PDF that uses Mozilla Headline
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 Mozilla Headline from the widths stored in your PDF, loads the complete open font, and sets your new text in Mozilla Headline itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 539.3 units per 1000 em |
|---|---|
| Average capital letter width | 650.4 units per 1000 em |
| Word space | 236 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 Mozilla Headline
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 (25.3 units)
- Mozilla Text Regularsimilar widths (25.8 units)
- Special Gothic Regularsimilar widths (27.3 units)
- Rubik Regularloosely similar widths (31.1 units)
- Geist Regularloosely similar widths (32.1 units)
- Oxanium Regularloosely similar widths (32.5 units)
- Exo 2 Regularloosely similar widths (32.9 units)
- Public Sans Regularloosely similar widths (33.2 units)
Compare Mozilla Headline
Questions people ask
+Can I edit a PDF that uses Mozilla Headline?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Mozilla Headline itself, loaded from the open font, so the edit matches the rest of the page.
+Is Mozilla Headline free to use?
Mozilla Headline 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 Mozilla Headline?
By measured letter widths, Radio Canada Big is the closest match among open fonts (a mean difference of 25.3 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Mozilla Headline support?
It includes these character sets: Latin, Central European.
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