Oi
Oi is a display font in 1 weight. Its lowercase letters are 83% wider than the typical display font. Last updated 5 September 2025.
Editing a PDF that uses Oi
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 Oi from the widths stored in your PDF, loads the complete open font, and sets your new text in Oi itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 957.2 units per 1000 em |
|---|---|
| Average capital letter width | 1029.9 units per 1000 em |
| Word space | 220 units per 1000 em |
| Digits | proportional (digit widths differ) |
| Spacing | proportional |
| Width of i compared with m | 41% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Display |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Oi
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.
- Goblin One Regularloosely similar widths (79.8 units)
- Sonsie One Regularloosely similar widths (96.2 units)
- Nosifer Regularloosely similar widths (98.5 units)
- Syncopate Regularloosely similar widths (100.7 units)
- Climate Crisis Regularloosely similar widths (102 units)
- Vast Shadow Regularloosely similar widths (102.7 units)
- Seymour One Regularloosely similar widths (103.1 units)
- Sekuya Regularloosely similar widths (103.9 units)
Compare Oi
Questions people ask
+Can I edit a PDF that uses Oi?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Oi itself, loaded from the open font, so the edit matches the rest of the page.
+Is Oi free to use?
Oi 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 Oi?
By measured letter widths, Goblin One is the closest match among open fonts (a mean difference of 79.8 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Oi support?
It includes these character sets: Arabic, Cyrillic, Cyrillic Extended, Greek, Latin, Central European, Tamil, Vietnamese.
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