Gzip/Brotli Test FAQ

The most frequently asked questions
How does this test work? This online test checks whether your website, and the server it's hosted on, has Gzip or Brotli compression enabled. It does this by connecting to your domain and requesting the necessary information. In addition, the test provides useful insights, such as the original file size of the tested web page and the potential benefits of enabling Gzip or Brotli compression.
What does Gzip compression do? Gzip is a compression algorithm that significantly reduces the size of web files, primarily HTML, CSS, and JavaScript by up to 70% to 80%. The compressed version of the file is sent to the user's browser instead of the original, larger file. The browser then automatically decompresses it and serves the original content to the user.
How does enabling Gzip or Brotli make my website faster? Since compressed files are much smaller in size (in bytes), your website loads more quickly. You can use our free website speed test to check if all files on your site are properly compressed.
How do I enable Gzip? Read our guide on enabling gzip compresssion to learn more, including additional details about the compression method.
What is Brotli? Brotli is an open-source data compression algorithm. In most cases, it compresses files more efficiently than Gzip, resulting in even smaller file sizes. Brotli also decompresses files faster than Gzip, making it a generally superior option.
Should I use Brotli instead of Gzip? While Brotli is supported by all major browsers, a few still lack full compatibility. To ensure broad coverage, you can configure your server to automatically switch between Brotli and Gzip based on the visitor's browser.