Rock 3D
Rock 3D is a display font in 1 weight. Its lowercase letters are 21% wider than the typical display font. Last updated 2 September 2025.
Editing a PDF that uses Rock 3D
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 Rock 3D from the widths stored in your PDF, loads the complete open font, and sets your new text in Rock 3D itself. The rest of the page is carried over untouched.
Measured metrics
| Average lowercase letter width | 636.5 units per 1000 em |
|---|---|
| Average capital letter width | 830 units per 1000 em |
| Word space | 1000 units per 1000 em |
| Digits | proportional (digit widths differ) |
| Spacing | proportional |
| Width of i compared with m | 63% |
| Printable ASCII characters covered | 94 of 94 |
| Category | Display |
Weights and styles
Languages beyond basic Latin
Open fonts closest to Rock 3D
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.
- Yuji Mai Regularloosely similar widths (97 units)
- Lexend Exa Regularloosely similar widths (98.8 units)
- BIZ UDPMincho Regularloosely similar widths (99.1 units)
- M PLUS U Regularloosely similar widths (101 units)
- Yuji Boku Regularloosely similar widths (103.6 units)
- DejaVu Serif Regularloosely similar widths (104.3 units)
- Lexend Giga Regularloosely similar widths (104.6 units)
- Hachi Maru Pop Regularloosely similar widths (104.8 units)
Compare Rock 3D
Questions people ask
+Can I edit a PDF that uses Rock 3D?
Yes. Drop the PDF into MythosPDF and click the text. New letters are set in Rock 3D itself, loaded from the open font, so the edit matches the rest of the page.
+Is Rock 3D free to use?
Rock 3D 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 Rock 3D?
By measured letter widths, Yuji Mai is the closest match among open fonts (a mean difference of 97 units per 1000 em). Text set in one takes almost the same space in the other.
+Which languages does Rock 3D support?
It includes these character sets: Japanese, Latin.
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