GZIP & Compression Checker
See whether the audited response declares HTTP content encoding.
How to use the GZIP & Compression Checker
See whether the audited response declares HTTP content encoding.
Interpret the results
Compression improves transfer efficiency for text assets, especially HTML, CSS and JavaScript. Check CDN and origin configuration without double-compressing responses.
Example
Compare an uncompressed HTML response after enabling Brotli.
Limits and methodology
This tests one fetched response and may differ from browser/CDN negotiation.
Use this tool together with related checks for a fuller picture. Recommendations are based on the available observed evidence, not on secret search engine ranking data.
Tool workflow and verification
Compare an uncompressed HTML response after enabling Brotli.
Compression improves transfer efficiency for text assets, especially HTML, CSS and JavaScript. Check CDN and origin configuration without double-compressing responses.
This tests one fetched response and may differ from browser/CDN negotiation.
This tool page is an educational guide as well as a functional utility. Demand trends and real search impressions must come from verified search data, not keyword guesses.
Frequently asked questions
What does this tool measure?
See whether the audited response declares HTTP content encoding.
How should I use its findings?
Compression improves transfer efficiency for text assets, especially HTML, CSS and JavaScript. Check CDN and origin configuration without double-compressing responses.
What are the limitations?
This tests one fetched response and may differ from browser/CDN negotiation.