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Check Gzip, Brotli and Deflate compression

Easily check any website for Gzip, Brotli and Deflate compression. Simply enter any publicly accessible URL into the input field and hit the button to check whether Gzip, Deflate and Brotli compression are enabled.

Test your URL

Check a website for Gzip, Brotli and Deflate compression


Compression Test Bookmarklet

Oh hey, WOW, there is a bookmarklet to do this?
Yeah, you can use my easy-to-use bookmarklet to test the compression methods of any website.
Simply drag the following button-like-styled link to your bookmarks toolbar.
Oh yeah, and click it when you are on the website you want to test...

Compression Test


Information on Brotli compression

What is Brotli compression?

Brotli is a new open source compression algorithim developed by Google as an alternative to Gzip, Zopfli, and Deflate. Google's case study on Brotli has shown compression ratios of up to 26% smaller than current methods, with less CPU usage.

Brotli Support

Both the server and the client (browser) must be Brotli compatible to take advantage of smaller file sizes and be running over an HTTPS connection. Brotli compression is currently supported by the following browsers:

With our free tool, You can easily test whether or not your web server is sending data compressed with Brotli to your clients' browser.
Negotiation is done via the Accept-Encoding: br request header.
Servers can add br to Content-Encoding: br to encode a response with Brotli.


Information on Gzip compression

This test will if whether a website has gzip enabled by connecting to the server and requesting the necessary information.
Gzip compression compresses web files (for example HTML, CSS, and JS files) to a smaller version, sometimes even 70% up to 80% smaller. This much smaller (compressed) version of a file is sent to the browser of the user. The browser of the user automatically decompresses the compressed file and serves the uncompressed original file.