Brotli Checker

What Brotli compression is

Brotli is a compression algorithm developed by Google and supported by all major modern browsers. It typically produces smaller files than gzip for text-based resources such as HTML, CSS, and JavaScript. Smaller payloads reduce transfer time and bandwidth usage, which can improve loading performance.

Why compression matters

Most web content is text-heavy. Compressing it before transmission significantly reduces the number of bytes sent over the network. Brotli is especially effective for static assets and is often enabled automatically by CDNs and modern web servers. Sites that serve uncompressed or gzip-only content may miss performance gains available through Brotli.

Interpreting the result

An "enabled" result means the server returned content compressed with Brotli for the tested request, as indicated by the Content-Encoding header. A "disabled" result means the response was not Brotli-compressed. Brotli requires client support, which browsers advertise through the Accept-Encoding request header. Server configuration determines whether Brotli is offered and for which content types.

Limitations

This tool tests a single response and reports the encoding observed. Compression behavior may differ by file type, server, CDN, and request headers. The tool does not measure the actual size reduction, compare Brotli against gzip for a specific file, or verify that all resources are compressed. Use the result to confirm basic support and inspect server or CDN settings if Brotli is not enabled.