Performance Tools
Compression Summary
A combined overview of a website's compression configuration - GZIP, Brotli, and content encoding.
Enter a domain for a combined overview of its compression configuration.
JustChecker tracks your website's performance signals continuously.
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.