GZIP Compression Checker
Test whether a website uses GZIP or Brotli compression and how much it saves.
Continue your work
- HTTP Headers Checker — Confirm the Content-Encoding header.
- Image Compressor — Shrink images, which GZIP cannot compress.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the GZIP Compression Checker
Test whether a website uses GZIP or Brotli compression and how much it saves.
- 1 Enter the page URL.
- 2 Click Test compression.
- 3 Check the result and savings. If compression is off, turn it on in your server or CDN.
Example and practical tips
A 120 KB HTML page usually shrinks to about 25 KB with GZIP, a saving of around 80%. That makes the page noticeably faster on slow mobile connections.
Frequently asked questions
GZIP or Brotli?
Brotli usually compresses text 15–20% better than GZIP and is supported by all modern browsers. Servers fall back to GZIP for older clients.
Should images be compressed with GZIP?
No. JPEG, PNG and WebP are already compressed. Compression helps HTML, CSS, JavaScript, JSON and SVG.
Report an issue
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