Castoro
Castoro is a serif font in 1 weight with italics. Its lowercase letters are about as wide as the typical serif font. Last updated 16 September 2025.
Editing a PDF that uses Castoro
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 Castoro from the widths stored in your PDF, loads the complete open font, and sets your new text in Castoro itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 512.4 units per 1000 em |
|---|---|
| Average capital letter width | 693.1 units per 1000 em |
| Word space | 220 units per 1000 em |
| Digits | proportional (digit widths differ) |
| Spacing | proportional |
| Width of i compared with m | 33% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Serif |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Castoro
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.
- Tiro Devanagari Hindi Regularidentical letter widths (0.4 units)
- Tiro Devanagari Sanskrit Regularidentical letter widths (0.4 units)
- Tiro Gurmukhi Regularidentical letter widths (0.4 units)
- Tiro Kannada Regularidentical letter widths (0.4 units)
- Tiro Tamil Regularidentical letter widths (0.4 units)
- Tiro Telugu Regularidentical letter widths (0.4 units)
- Tiro Bangla Regularidentical letter widths (0.4 units)
- Tiro Devanagari Marathi Regularidentical letter widths (0.4 units)
Compare Castoro
Questions people ask
+Can I edit a PDF that uses Castoro?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Castoro itself, loaded from the open font, so the edit matches the rest of the page.
+Is Castoro free to use?
Castoro 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 Castoro?
By measured letter widths, Tiro Devanagari Hindi is the closest match among open fonts (a mean difference of 0.4 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Castoro support?
It includes these character sets: Latin, Central European.
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