GZIP Compression Test
Check how much a page’s HTML would shrink with GZIP compression — and whether it’s worth fixing.
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About this tool
Text compression is the cheapest speed win on the web. This tool fetches a page’s HTML and compresses it live in your browser with real GZIP, showing exact before/after sizes and transfer savings — so you can verify what proper server compression delivers and hand your host concrete numbers.
How to use the GZIP Compression Test
- Enter the page URL.
- See the raw HTML size vs GZIP-compressed size.
- If savings are large, enable compression via our Caching Rules Generator.
Frequently asked questions
How much does GZIP save?
HTML, CSS and JS typically shrink 60–80%. Brotli (the newer standard) squeezes out roughly 15–20% more than GZIP.
How do I enable compression?
Most hosts support it via .htaccess (mod_deflate) or nginx config — grab ready-made rules from our Browser Caching & Compression Generator.