Prosto One
Prosto One is a display font in 1 weight. Its lowercase letters are 18% wider than the typical display font. Last updated 10 September 2025.
Editing a PDF that uses Prosto One
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 Prosto One from the widths stored in your PDF, loads the complete open font, and sets your new text in Prosto One itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 617.9 units per 1000 em |
|---|---|
| Average capital letter width | 795.8 units per 1000 em |
| Word space | 350 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 | Display |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Prosto One
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.
- Days One Regularloosely similar widths (31.3 units)
- BBH Sans Hegarty Regularloosely similar widths (44.2 units)
- BBH Hegarty Regularloosely similar widths (44.2 units)
- Goldman Regularloosely similar widths (47.2 units)
- Unbounded Regularloosely similar widths (48.1 units)
- Hepta Slab Regularloosely similar widths (50.5 units)
- Uncial Antiqua Regularloosely similar widths (51.5 units)
- Audiowide Regularloosely similar widths (51.8 units)
Compare Prosto One
Questions people ask
+Can I edit a PDF that uses Prosto One?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Prosto One itself, loaded from the open font, so the edit matches the rest of the page.
+Is Prosto One free to use?
Prosto One 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 Prosto One?
By measured letter widths, Days One is the closest match among open fonts (a mean difference of 31.3 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Prosto One support?
It includes these character sets: Cyrillic, Latin, Central European.
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