Enter a page address to see whether the server compresses it with gzip or Brotli. Free, instant, no signup.
A free checker for whether gzip or Brotli compression is enabled on a page. Enter a URL and it requests the page the way a browser does, offering gzip, deflate and Brotli, and shows the Content-Encoding the server answers with. No signup, no email.
Text compresses well, often to a third of its size or less. Smaller responses download faster, which helps Largest Contentful Paint, especially on mobile connections.
A page can be compressed while its script files are not, or the reverse, so check your main CSS and JavaScript files too. The HTTP Header Checker shows every header of any URL.
Enter the page's address above. The tool sends a request that accepts gzip, deflate and Brotli and shows the Content-Encoding header the server returns. If the header is missing, the page was sent uncompressed.
For text such as HTML, CSS and JavaScript, Brotli usually produces smaller files than gzip at similar speed, and every modern browser supports it. gzip is still fine and is supported everywhere.
Most hosts and CDNs have a switch for it. On Nginx use the gzip or brotli directives, on Apache use mod_deflate or mod_brotli, and on Cloudflare compression is on by default.
