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Check GZIP Compression Online – Test Website GZIP & Brotli Status

Check GZIP Compression Online

Audit your website's HTTP compression status. Test if GZIP or Brotli is active, calculate bandwidth savings, and inspect server compression headers instantly.

Try quick examples: vibetool.org google.com github.com wikipedia.org
Connecting to remote server & analyzing HTTP headers...
UNCOMPRESSED 0 KB
COMPRESSED 0 KB
ENCODING gzip
WEB SERVER Nginx
Compressed
Bandwidth Saved

What is GZIP Compression and Why Does It Matter?

GZIP is an open-source file compression algorithm designed to reduce the file size of HTTP network responses (such as HTML documents, CSS stylesheets, JavaScript files, and JSON API payloads). When a web browser requests an asset from an HTTP web server, it sends an Accept-Encoding: gzip, deflate, br header indicating it can decompress zipped streams.

By compressing text files before sending them over the internet, GZIP typically shrinks payload file sizes by 70% to 85%. This dramatically accelerates page load times, improves Google Core Web Vitals (specifically Largest Contentful Paint / LCP), and saves web hosting bandwidth costs.

How to Enable GZIP in Apache (`.htaccess`)

On Apache web servers running mod_deflate, you can enable GZIP compression by adding the following rules into your root .htaccess file:

<IfModule mod_deflate.c>
  AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css
  AddOutputFilterByType DEFLATE text/javascript application/javascript application/x-javascript
  AddOutputFilterByType DEFLATE application/json application/xml application/rss+xml
  AddOutputFilterByType DEFLATE image/svg+xml
</IfModule>

How to Enable GZIP in Nginx

On Nginx servers, add or verify the following directives inside your nginx.conf or site configuration block:

gzip on;
gzip_vary on;
gzip_min_length 1024;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml application/javascript application/json image/svg+xml;

Frequently Asked Questions (FAQ)

Brotli (br) is a newer compression algorithm developed by Google that offers roughly 15% to 20% better compression density than GZIP on HTML, CSS, and JavaScript text. Modern web servers and CDNs (like Cloudflare) automatically serve Brotli to compatible browsers and fall back to GZIP for legacy clients.
No. Formats like JPEG, PNG, and WebP are already heavily compressed binary files. Attempting to compress them with GZIP does not reduce file size and needlessly wastes server CPU cycles. The only image format that should use GZIP is SVG because SVG is XML-based text.
Yes, indirectly and directly. Page speed and Core Web Vitals are confirmed Google ranking factors. Enabling GZIP reduces byte payloads, speeding up time-to-first-byte (TTFB) and First Contentful Paint (FCP), which positively impacts SEO rankings and crawler budget.

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