How to check if a site serves gzip / brotli compression

1. Enter the URL

   Put the https://… address into the "Website URL" field. Scheme is added when missing; up to 2048 characters.

2. 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.

3. 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.

4. 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.