Performance Tools

Compression Summary

A combined overview of a website's compression configuration - GZIP, Brotli, and content encoding.

Not sure what to enter? Try an example: wikipedia.org

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Enter a domain for a combined overview of its compression configuration.

Is my website's compression set up correctly?

This summary checks GZIP, Brotli and the Content-Encoding the server actually uses in one go, so you can see at a glance whether text responses are compressed with the best format the browser supports.

How to get a compression summary

Enter the domain in the box above.
Click Get Summary.
Review which formats are enabled.
Aim for Brotli with GZIP as a fallback.

Related checks

For GZIP details, use the GZIP Compression Checker.
For a full speed overview, use the Performance Health Score.

Use this summary as a checklist: switch on compression for any file type marked uncompressed, then run the check again. JustChecker keeps watching response times so a later server change does not undo the work.

Frequently Asked Questions

This combines all three into a single overview, showing which compression methods are supported and which is actually being used right now, saving the step of running each individual tool separately when you want the full picture at once.

It's generally worthwhile if your server/CDN supports it, since Brotli typically compresses more efficiently than GZIP for equivalent content, offering a further reduction in transferred bytes with no downside for supporting clients.

It reports the compression actually observed on the specific page checked - static assets and dynamically-generated pages can sometimes have different compression configurations, so results may vary by which URL is checked.

Ideally, both GZIP and Brotli available (letting the server pick the best one each client supports), applied to text-based content while leaving already-compressed formats like images alone.

Yes - larger, uncompressed transfers directly slow down metrics like Largest Contentful Paint, since the browser has more data to download before it can render key content.

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