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Inlining Images & Fonts in CSS

Warning: You are browsing the documentation for Symfony 5.x, which is no longer maintained.

Read the updated version of this page for Symfony 7.2 (the current stable version).

A simple technique to improve the performance of web applications is to reduce the number of HTTP requests inlining small files as base64 encoded URLs in the generated CSS files.

You can enable this in webpack.config.js for images, fonts or both:

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// webpack.config.js
// ...

Encore
    // ...
    .configureImageRule({
        // tell Webpack it should consider inlining
        type: 'asset',
        //maxSize: 4 * 1024, // 4 kb - the default is 8kb
    })

    .configureFontRule({
        type: 'asset',
        //maxSize: 4 * 1024
    })
;

This leverages Webpack Asset Modules. You can read more about this and the configuration there.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
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