Roboto Flex
Roboto Flex is a sans serif font in 1 weight, also available as a variable font. Its lowercase letters are 5% narrower than the typical sans serif font. Last updated 5 September 2025.
Editing a PDF that uses Roboto Flex
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 Roboto Flex from the widths stored in your PDF, loads the complete open font, and sets your new text in Roboto Flex itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 494.6 units per 1000 em |
|---|---|
| Average capital letter width | 629.7 units per 1000 em |
| Word space | 244.1 units per 1000 em |
| Digits | tabular (every digit is 564.5 units wide, so columns of numbers line up) |
| Spacing | proportional |
| Width of i compared with m | 28% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Sans serif |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Roboto Flex
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.
- Funnel Sans Regularsimilar widths (27.6 units)
- Heebo Regularsimilar widths (27.9 units)
- Radio Canada Big Regularsimilar widths (28 units)
- 42dot Sans Regularsimilar widths (29.2 units)
- Asta Sans Regularsimilar widths (29.2 units)
- Vazirmatn Regularsimilar widths (29.4 units)
- Roboto Regularsimilar widths (29.6 units)
- Oxanium Regularloosely similar widths (30.2 units)
Compare Roboto Flex
Questions people ask
+Can I edit a PDF that uses Roboto Flex?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Roboto Flex itself, loaded from the open font, so the edit matches the rest of the page.
+Is Roboto Flex free to use?
Roboto Flex 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 Roboto Flex?
By measured letter widths, Funnel Sans is the closest match among open fonts (a mean difference of 27.6 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Roboto Flex support?
It includes these character sets: Cyrillic, Cyrillic Extended, Greek, Latin, Central European, Vietnamese.
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