External CSS and Fonts

Rendering images using external CSS and custom fonts.

The API supports including any CSS file or custom font. You can do this by including them in your HTML/CSS.

Be sure to use the full URL to the asset. We are unable to download relative URLs.

External CSS Example

For an external CSS file, at it to your HTML with the following. Replace href with the URL to your CSS file.

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Primer/10.8.1/build.css" />

External Font Example

You can load in a custom font using CSS.

@font-face {
  font-family: "CustomFont";
  src: url(https://url-to-your-font/FontNameRegular.ttc);
.box {
  font-family: "CustomFont"

Your font will need proper CORS headers set for this to work. To test it, visit test-cors.org and paste in your font link.

If it does not work, check that you have the following header set on your server.

access-control-allow-origin: *

Google Fonts

If your custom font is available on Google Fonts, we recommend using our built in parameter for pre-loading them.

Need help?

If you're having trouble with any of this. Send us an email and we'll help you debug: [email protected]