Test if your website uses GZIP for faster load times

Use our free GZIP Compression test to see if your website is sending compressed content. Improve site speed, reduce bandwidth, and boost SEO.

Website speed is a critical factor for SEO, user experience, and bounce rates — and enabling GZIP compression is one of the easiest ways to improve it. The GZIP Compression Checker lets you test any URL to see if GZIP (or Brotli) compression is enabled and working.

Whether you’re optimizing your own site or analyzing a competitor’s setup, this tool gives you fast, clear insights into how efficiently a server is delivering content.

What Is GZIP Compression?

GZIP compression reduces the size of your website’s HTML, CSS, JavaScript, and other text-based files before sending them to a visitor’s browser. This minimizes bandwidth usage and speeds up load times — especially for mobile users and international visitors.

Many modern servers also use Brotli, a newer compression format that offers even better compression rates in some cases.

Why Use a GZIP Compression Checker?

Not all websites — or web servers — have GZIP properly configured. The GZIP Compression Checker helps you:

• See if a domain is using compression (GZIP or Brotli)
• Identify whether compression is missing for key file types
• Confirm that your server, CDN, or hosting environment is optimizing content
• Improve your Core Web Vitals scores
• Reduce bounce rates and boost conversions with faster loading pages

Features of the GZIP Compression Checker Tool

• Instant Test: See if GZIP or Brotli is enabled for any website URL
• Real-Time Results: Detects compression status from live server headers
• Header Analysis: View response headers to verify Content-Encoding values
• Supports HTTPS: Works with secure (SSL-enabled) and non-secure URLs
• Clear Pass/Fail Output: Know immediately if compression is working
• No Login or Install Required: 100% free and browser-based

How to Use the GZIP Compression Checker

1. Enter the full URL of the webpage you want to test (e.g., https://example.com)
2. Click “Check”
3. The tool will return whether compression is enabled, along with the detected method (gzip, br, or none)

You’ll also see the relevant HTTP response headers for transparency.

Example Output

Input:
https://www.chemicloud.com

Detected Compression:
✔ Yes – Content-Encoding: gzip

Headers:

Content-Encoding: gzip  
Vary: Accept-Encoding  
Content-Type: text/html; charset=UTF-8

This confirms that the site is using GZIP and is optimized for delivery.

Use Cases for GZIP Compression Testing

• Web Developers: Verify server and CDN-level optimization
• Marketers & SEOs: Confirm site speed enhancements are in place
• Hosting Clients: Ensure your host is enabling compression by default
• Support Teams: Troubleshoot slow-loading pages for customers
• Agencies: Audit websites for technical SEO performance

Benefits of Enabling GZIP or Brotli

• Reduces file size by up to 70%
• Accelerates page load time
• Saves bandwidth costs
• Improves Google PageSpeed and Core Web Vitals
• Delivers better performance on slower or mobile connections

With the GZIP Compression Checker, you can verify if your site is leveraging compression for faster delivery — helping you reduce page weight, increase engagement, and rank better in search.