HTTP Compression & Gzip Checker

HTTP Compression Checker asks a URL for a compressed response and reports which algorithm, if any, the server actually used.

The request declares that gzip, deflate and brotli are all acceptable, and the verdict is read from the Content-Encoding header of the response that comes back — so this is what the server did, not what its configuration file claims it should do. You get the algorithm in use, the size actually transferred, the Content-Length the server declared, and for an uncompressed response an estimate of what compression would have saved. Only the one address you enter is requested, so a site whose HTML is compressed while its stylesheets are not will still report as compressed; test the asset URLs separately.

The URL is passed to ShortTrick's own server, which performs the request and returns the headers it received. No external compression or scanning service is involved, and the request arriving at the tested site is identified as coming from this tool.

Confirming a server configuration change took effect, checking whether a CDN compresses what the origin does not, diagnosing a text asset that transfers larger than expected, and verifying brotli reaches real clients.

Also known as: gzip checker · brotli compression test · test gzip enabled · http compression · reduce checker size · shrink checker