Performance Tools
Brotli Compression Checker
Check whether a website serves Brotli-compressed content.
Enter a domain to check whether it serves Brotli-compressed content.
JustChecker tracks your website's performance signals continuously.
Frequently Asked Questions
Brotli generally achieves noticeably better compression ratios than GZIP for the same content, meaning smaller transferred file sizes and faster loads - most modern browsers support it, making it a strict upgrade where available.
No - the best practice is offering both, letting the server automatically serve Brotli to clients that support it and gracefully fall back to GZIP for those that don't, rather than choosing one exclusively.
Brotli support requires a specific server module or CDN feature that isn't always enabled by default, unlike GZIP which has been a near-universal standard for much longer - it sometimes needs to be explicitly turned on.
Every current major browser does, but this is why servers should still offer a GZIP fallback for any older or unusual client that doesn't negotiate Brotli support.
At higher compression levels, yes, Brotli can require more CPU time - many setups use it primarily for static, pre-compressed assets (where the compression cost is paid once, not per-request) rather than dynamically compressing every response live.
Yes - many CDNs can compress content with Brotli at the edge regardless of what the origin server sends, which is a common, low-effort way to gain Brotli support without modifying origin server configuration.