Compression Tester
Probe whether the document responds with gzip/Brotli when clients advertise Accept-Encoding.
Performance and page weight
Last reviewed Nov 11, 2026
Free, no signup
Enter a URL to probe Content-Encoding negotiation.
Setup required
Encoding
Identity bytes
Savings
%
HTML
Sampled assets
Estimated total
Assets found
Heaviest sampled assets
| Type | Bytes | URL |
|---|---|---|
Blocking CSS ()
Blocking JS ()
Checks
FAQ
Yes. Fair-use rate limits keep the suite available for everyone.
Yes. CDNs, registry redaction, and heuristics mean you should verify critical findings in your own environment.
Runs are processed to return results. Avoid pasting secrets or personal data you would not put in a public tool.