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Free Brotli Compression Checker

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Verify if a server is compressing web pages using Brotli. Compare Brotli vs Gzip compression to optimize speed, bandwidth, and SEO scores.

What is Brotli Compression?

Brotli is an open-source data compression algorithm developed by Google. It is designed to compress text-based assets like HTML, CSS, and JavaScript. By compressing these assets on the server before transmitting them to the client browser, Brotli reduces file sizes, saves bandwidth, and speeds up web page rendering.

Brotli vs Gzip: Which is Better?

While Gzip has been the industry standard for decades, Brotli offers superior compression ratios. On average, Brotli compresses text assets 15% to 25% better than Gzip. This results in smaller payloads, faster page rendering, and improved page load times (Core Web Vitals), which can help improve search engine rankings. Most servers fall back to Gzip automatically if a browser does not declare support for Brotli.

Key Indicators of Brotli Support

  • content-encoding: br: This HTTP response header indicates that the server successfully compressed the asset using Brotli.
  • Reduced Payload: Visual comparison of uncompressed vs compressed asset sizes.

Combine this test with our HTTP Headers Lookup to inspect additional response headers, or test protocol optimization with our HTTP/2 Checker.

Details - FAQ

If Brotli is active, the web server will return the `content-encoding: br` header in the HTTP response. Our tool checks this header automatically to confirm support.

Yes, all major modern web browsers support Brotli compression. If a browser does not support it, the server falls back to Gzip compression.

Brotli reduces asset sizes, speeding up page load times. Since site speed is a ranking factor in Google search, Brotli can help improve organic visibility.

No, Brotli is designed to compress text assets (HTML, CSS, JS). Images (like JPEG, PNG, WEBP) are already compressed and compressing them again with Brotli can increase CPU load without reducing file size.

You must install the Brotli module (e.g., `ngx_brotli` for Nginx or `mod_brotli` for Apache) and add the configuration parameters to your server configuration files.

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