Base64 for Web Fonts: Inline Fonts in CSS with @font-face
Embed web fonts directly in CSS using Base64 data URIs. Learn the syntax, size impact, caching trade-offs, and when inline fonts make sense.
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Tags: encoding, fonts, base64
Base64 for Web Fonts: Inline Fonts in CSS with @font-face The rule normally references external font files by URL. The browser fetches them after parsing the CSS, which can cause a flash of invisible text (FOIT) or flash of unstyled text (FOUT) while the font loads. Embedding the font as a Base64 data URI in the CSS eliminates that separate request — the font is available the moment the stylesheet is parsed. This technique has genuine use cases and real costs. Knowing both sides helps you decide when it's worth it. How @font-face with Base64 Works The standard declaration references external files: The Base64 version replaces the URL with a data URI: The browser treats both identically once it has the CSS. The difference is entirely in how the font data arrives — embedded in the…
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