Something wrong with this tool?
About Website Gzip Compression Checker Online
This tool fetches the HTML and key assets of a given URL and reports the gzip (or brotli) compression status for each one. You see per-asset compression ratios, total transferred bytes, and how much could be saved if compression were applied to currently-uncompressed responses.
Checking a whole page rather than a single URL highlights where compression is missing — often static images, fonts, or third-party scripts that bypass the server's main compression layer. Each one of these is a quick fix that meaningfully improves page load.
Useful as part of a Core Web Vitals audit, before a launch, or as ongoing monitoring on a few representative pages.
How to use this tool
How to check if a site serves gzip / brotli compression
Enter the URL
Put the https://… address into the "Website URL" field. Scheme is added when missing; up to 2048 characters.
What's being measured
Our server sends Accept-Encoding: gzip, deflate, br over HTTP/1.1 and reads the response's Content-Encoding header. That tells you what the origin actually applied for the bytes.
Press Run
Result includes which encoding (if any) the origin used, plus raw/compressed sizes when available so you can see the actual on-the-wire savings.
Interpret missing compression
If Content-Encoding is absent, the response was sent uncompressed — usually a misconfigured proxy, a vary-on-User-Agent quirk, or HTML small enough to skip. Re-test with a different URL on the same host if you suspect it's per-route.