How to Use Custom Fonts with Dompdf: A Guide to Overcoming Font-Family Configuration Challenges.

Dompdf and Custom Font-Family Configuration

When generating PDFs using Dompdf, users may encounter difficulties overriding the default Times New Roman font with a specified font-family. The root cause lies in Dompdf's internal support for a limited set of predefined fonts.

Understanding Font Support in Dompdf

Dompdf embeds referenced fonts in PDF documents if they are pre-loaded or accessible through CSS @font-face rules. To utilize custom fonts, they must be loaded prior to generating the PDF.

Font Loading Options

Dompdf offers three methods for loading custom fonts:

1. CSS @font-face Rules

Load fonts at runtime without requiring command line access.

@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: normal;
  src: url(font.ttf) format('truetype');
}

2. Command Line Utility

Use the bundled utility dompdf/load_font.php if command line access is available.

load_font.php "NeutraText-Book" /path/to/neutratext.ttf

3. Admin Site

Browse to dompdf/www/fonts.php in the included admin site (username/password modification may be required).

Note: Loaders for extracting font metrics, including load_font.php and the admin site, will no longer be included starting with Dompdf 0.7.0.

Additional Considerations

• Ensure that font metrics (.afm/.ufm) are available for referenced fonts, either in the PDF metadata or via sub-setting.
• Referenced fonts must be accessible via a valid URL or file path.
• Dompdf supports Type 1 (.pfb) and TrueType (.ttf) fonts.

Conclusion

By leveraging these font loading techniques, developers can specify and utilize custom fonts in Dompdf-generated PDFs, improving the visual appeal and flexibility of their documents.

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