gzip compression test

about gzip compression test

Check whether a website has GZIP compression enabled and see how much bandwidth it saves — a critical performance optimization for faster page loads.

GZIP compression is one of the simplest and most effective ways to improve website performance. When enabled, the server compresses HTML, CSS, JavaScript, and other text-based resources before sending them to the browser, dramatically reducing transfer sizes. Most modern browsers support GZIP decompression transparently.

This tool fetches the specified URL from our server with an Accept-Encoding header requesting compressed content, then inspects the response headers to determine if GZIP (or another compression method like Brotli) is being used. It reports the compressed and uncompressed sizes along with the compression ratio.

If compression is not enabled, you're missing out on significant bandwidth savings — typically 60-80% for text-based resources. Most web servers (Apache, Nginx, Cloudflare) support GZIP with simple configuration changes. Enabling it is one of the highest-impact, lowest-effort optimizations you can make.

Results are color-coded green when compression is detected and yellow when it's absent. The test is performed server-side to ensure accurate header inspection, as browser developer tools may show different results due to local caching or proxy behavior.