Brotli Checker

1. Introduction

Brotli Checker is a simple online tool that helps you determine whether a website is using Brotli compression. Brotli is a modern compression algorithm that reduces file sizes transferred between a web server and a browser, improving page speed and overall performance.

When a website supports Brotli, it can deliver compressed HTML, CSS, JavaScript, and other assets more efficiently. This results in faster load times, reduced bandwidth usage, and improved SEO performance. Search engines prioritize fast-loading websites, making compression an important optimization technique.

This tool is especially useful for developers, SEO specialists, system administrators, and website owners who want to verify whether Brotli is properly configured on their server or CDN. Simply enter a URL, and the tool checks the server response headers to confirm if Brotli compression is enabled.

2. How It Works

The Brotli Checker performs a server request to the specified URL and analyzes the HTTP response headers to determine if Brotli compression is enabled.

Input Parameter

• URL – The full website address you want to test (e.g., https://example.com). This field is required.

Validation Rules

• The URL field must not be empty.
• The URL must be properly formatted.
• Security validation ensures the request is legitimate.
• If the URL cannot be reached, an error is displayed.

Request Logic

The tool sends an HTTP GET request to the provided URL with the header:

Accept-Encoding: br

This header tells the server that the client supports Brotli compression. If the server supports Brotli, it will respond with a Content-Encoding header that includes br.

Response Analysis

The tool checks the response headers for:

• Content-Encoding: br

If the header contains br, Brotli compression is enabled. If not, Brotli is either disabled or not configured for that resource.

Output Format

• True – Brotli compression is enabled.
• False – Brotli compression is not detected.

Limitations

• Some servers enable Brotli only for specific file types.
• CDN configurations may affect compression results.
• Firewall or server restrictions may block the request.

3. How to Use This Tool

1. Enter the full website URL (including https://).
2. Click the process button.
3. Wait for the tool to fetch the server response.
4. Review the result to see if Brotli compression is enabled.

4. Practical Examples

Example 1: Brotli Enabled

Input:

https://example.com

Output:

True

In this case, the server responded with Content-Encoding: br, confirming that Brotli compression is active.

Example 2: Brotli Not Enabled

Input:

https://oldsite.com

Output:

False

The server did not return the Brotli encoding header, indicating that Brotli compression is not configured or not supported.

5. Developer Use Cases

- Server Optimization Testing

Verify whether your Apache, Nginx, or LiteSpeed server is properly configured to use Brotli.

- CDN Configuration Validation

Check whether your CDN (such as Cloudflare or similar services) is delivering compressed responses.

- SEO Performance Audits

Include Brotli validation as part of a technical SEO audit workflow.

- Automated Monitoring

Integrate compression checks into deployment pipelines to ensure Brotli remains enabled after updates.

Example in PHP

$response = file_get_contents('https://example.com');
$headers = get_headers('https://example.com', 1);
if(isset($headers['Content-Encoding']) && 
   strpos($headers['Content-Encoding'], 'br') !== false) {
    echo "Brotli enabled";
}

Example in JavaScript (Node.js)

const https = require('https');
https.get('https://example.com', { headers: { 'Accept-Encoding': 'br' } }, (res) => {
  if (res.headers['content-encoding'] && 
      res.headers['content-encoding'].includes('br')) {
    console.log('Brotli enabled');
  }
});

Security Considerations

• Always validate and sanitize user-provided URLs.
• Prevent server-side request forgery (SSRF).
• Implement request timeouts to avoid hanging connections.

6. FAQ

What is Brotli compression?

Brotli is a modern compression algorithm developed to reduce the size of web resources and improve loading speed.

Is Brotli better than Gzip?

In most cases, Brotli provides better compression ratios than Gzip, especially for text-based assets.

Does Brotli improve SEO?

Yes. Faster page load times contribute to better user experience and can positively impact search rankings.

How do I enable Brotli on my server?

You can enable Brotli through server modules (Apache/Nginx) or via your CDN settings.

Why does the tool show Brotli disabled?

The server may not support Brotli, or it may only enable it for specific file types.

Can Brotli be used with HTTPS?

Yes. Brotli works over both HTTP and HTTPS, but it is most commonly used with HTTPS connections.