Note: Mija isn’t a Google Font, but the principles of caching aren’t vendor-specific. The Google Fonts browser cache is set to expire after one year unless the cache is cleared sooner. As the Google Fonts API becomes more widely used, it is likely visitors to your site or page will already have any Google fonts used in your design in their browser cache.
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SmashingMagazine, for example, uses a font called ‘Mija’, if this is the first time your browser has seen that font, it will need to download it completely before the text is displayed, but the next time you visit a website using that font, the browser will use the cached version.
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This is a great feature of Google Fonts, by checking the user-agent they are able to serve the most performant formats to browsers that support those, while still displaying the fonts consistently on older browsers.Īnother built-in optimization of Google Fonts is browser caching.ĭue to the ubiquitous nature of Google Fonts, the browser doesn’t always need to download the full font files.
Google Fonts maintains 30+ optimized variants for each font and automatically detects and delivers the optimal variant for each platform and browser. If I change my user-agent to Internet Explorer 11, I’m served the font in the WOFF format instead.įinally, if I change my user agent to IE8 then I get the font in the EOT (Embedded OpenType) format. I’m using the latest version of Chrome, which like most browsers supports WOFF2, so the font is served to me in that highly compressed format. When the browser makes a request to the API, Google first checks which file types the browser supports. However, if I request the same font variant from the API, I’m provided with this file. Let’s look at Roboto, GitHub tells us that the regular variant weighs 168kb. The Google Fonts API does more than just provide the font files to the browser, it also performs a smart check to see how it can deliver the files in the most optimized format. However, get it wrong and your users could be waiting up to a few seconds before any text is displayed. With the correct setup, the additional load time isn’t noticeable. Each font carries a weight that the web browser needs to download before they can be displayed. Like all good things, Google Fonts do come with a cost. For example, Arial and Georgia are packaged with Windows, macOS and Linux distributions. System fonts or ‘Web Safe Fonts’ are the fonts most commonly pre-installed across operating systems. Without Google Fonts you would be limited to the handful of “ system fonts” installed on your user’s device. As of writing, they have been viewed over 29 trillion times across the web and it’s easy to understand why - the collection gives you access to over 900 beautiful fonts you can use on your website for free. It’s fair to say Google Fonts are popular. Let’s explore how we can load them in the most optimal way.
Google Fonts are easy to implement, but they can have a big impact on your page load times.
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