Gzip Compression Checker

Verify if Gzip or Brotli compression is enabled and calculate bandwidth savings.

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Features

Compression Detection

Identifies if the server uses Gzip (`gzip`), Brotli (`br`), or Deflate (`deflate`).

Bandwidth Savings

Dual-check technology performs requests with and without compression to calculate exact savings.

Status Verification

Color-coded confirmation tells you instantly if your compression meets performance standards.

Chunked Transfer Support

Detects compression even when the server serves content in chunks (no Content-Length).

About Gzip Compression Checker

The Gzip Compression Checker is a vital performance tool. It analyzes your website's server response to verify if Gzip or Brotli compression is enabled. Compression drastically reduces the size of HTML, CSS, and JavaScript files sent to the browser—often by 70% or more. This tool compares the uncompressed size vs. the compressed size to show you exactly how much bandwidth you are saving.

How to Use Gzip Compression Checker

  • 1
    Enter URL

    Input the homepage or specific page URL to test.

  • 2
    Start Test

    Click 'Check Compression' to probe the server.

  • 3
    View Savings

    See the exact reduction in file size and the compression method used.

  • 4
    Optimize

    If disabled, configure your server (Nginx/Apache) to enable Gzip or Brotli.

Frequently Asked Questions

Brotli (br) is a newer compression algorithm that generally offers better compression ratios than Gzip, but Gzip is more widely supported on older systems. Modern browsers support both.
It reduces the amount of data transferred over the network, leading to faster page loads, lower data usage for mobile users, and better SEO rankings.
This means the server sends data in parts. We can confirm compression is active via headers, but we might not be able to report the exact compressed file size.