GZIP Checker – Check GZIP Compression Free Online
Check if GZIP or Brotli compression is enabled on any website. Verify Content-Encoding headers for any URL. Free, instant results.
What is GZIP Checker?
GZIP and Brotli are HTTP compression algorithms that reduce the size of text files (HTML, CSS, JavaScript) before sending them to browsers. Enabling compression typically reduces file sizes by 70–80%, significantly speeding up page loads. Our GZIP checker reads the Content-Encoding response header to verify whether compression is active on any URL.
How to Use GZIP Checker
- 1Enter the URL of the site you want to check.
- 2Click Check Compression to inspect headers.
- 3See the Content-Encoding header value.
- 4If no encoding is found, enable GZIP or Brotli on your web server.
- 5Re-test to confirm compression is working.
Key Features
- ✓Checks Content-Encoding response header
- ✓Detects GZIP, Brotli, and Deflate compression
- ✓Pass/fail result with explanation
- ✓Shows exact header value
- ✓Instant results
Benefits
- →Verify compression is active before and after server changes
- →Improve page speed scores by enabling compression
- →Reduce bandwidth costs
- →Pass Core Web Vitals compression recommendations
Why Use Irreva for GZIP Checker?
Frequently Asked Questions
Does GZIP affect SEO?
Yes, indirectly. GZIP reduces page size, which improves page load speed — a direct Google ranking factor since 2010 and part of Core Web Vitals. Compressed pages also crawl faster, benefiting crawl budget.
How do I enable GZIP on my server?
For Apache, add 'AddOutputFilterByType DEFLATE text/html text/css application/javascript' to your .htaccess. For Nginx, add 'gzip on;' to your config. Most CDNs (Cloudflare, Fastly) enable compression automatically.
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