Measures whether a page uses GZIP/Brotli compression and how much bandwidth is saved as a result.
What Is GZIP Compression?
GZIP (and the more modern Brotli) is a technique that compresses text-based files such as HTML, CSS, and JavaScript before they are sent from the server to the browser. For text files it typically delivers a 60–80% reduction in size, which means faster loading and lower bandwidth usage.
How Does It Work?
The tool sends a request to the target page with the Accept-Encoding: gzip, deflate, br header and checks the Content-Encoding header in the server's response. It then compares the compressed and uncompressed sizes to calculate the savings ratio.
How Do You Use It?
- Enter the URL you want to test.
- See whether compression is active and what the savings percentage is.
Tip: If compression is disabled, enable the gzip or brotli module on your server (Apache/LiteSpeed/Nginx). On LiteSpeed servers this is usually enabled by default.
Frequently Asked Questions
Which is better, GZIP or Brotli?
Brotli generally provides slightly better compression than GZIP and is supported by modern browsers. Both can be offered together; the browser then picks the most suitable one.
Are images compressed too?
No. Images such as JPEG/PNG/WebP are already compressed; GZIP only delivers meaningful savings for text-based files.
