How do I check if my website uses GZIP or Brotli compression?

Enter your URL into the GZIP/Brotli Compression Checker. It fetches the page with compression enabled and reports which algorithm is used, the original vs. transferred size, and how much bandwidth you save.

How do I know if my site uses GZIP or Brotli?

Enter your URL above. The tool reads the raw response (bypassing automatic decompression) and reports the true Content-Encoding plus the compressed and original byte counts, so you see exactly what is happening on the wire.

Should I use GZIP or Brotli?

Brotli usually compresses text 15 to 25 percent smaller than GZIP at similar speeds, and every modern browser supports it. Serve Brotli when your server or CDN offers it, with GZIP as the fallback for older clients.

What should be compressed?

Text assets: HTML, CSS, JavaScript, JSON, XML, SVG, and web fonts. Images, video, and audio are already compressed formats; re-compressing them wastes CPU for no gain.

Why does compression matter for speed and SEO?

Smaller transfers mean faster page loads, especially on mobile networks, and page speed is a Google ranking signal. Compression is one of the cheapest performance wins available: it is usually a single server or CDN setting.

My tool says compression is enabled but savings are tiny. Why?

The page may consist mostly of already-compressed assets like images, the compression level may be set very low, or a proxy may be stripping the encoding. Check the content breakdown and confirm text assets specifically are being compressed.

DEVELOPER TOOLS · FREE ONLINE TOOL

GZIP/Brotli Compression Checker

Verify real GZIP or Brotli compression and see the exact bytes savedA page that ships its text uncompressed is leaving free speed on the table. This checker asks your URL for its response headers and reports which compression the server actually applied, so you know whether that effortless performance win is on or silently missing.

✓ Free to use✓ No sign-up✓ Ready in your browser

// GZIP/BROTLI COMPRESSION CHECKER · GET STARTED

Use GZIP/Brotli Compression Checker

Verify real GZIP or Brotli compression and see the exact bytes saved

// GZIP/BROTLI COMPRESSION CHECKER · HOW IT WORKS

How to use the GZIP/Brotli Compression Checker

Enter URL

Enter the website URL you want to test (e.g. https://example.com).

Analyze raw bytes

Click "Check Compression" and wait while the raw bytes are analyzed.

Review savings

Review the encoding, the size comparison, and the savings verdict.

// GZIP/BROTLI COMPRESSION CHECKER · ABOUT THIS TOOL

About the GZIP/Brotli Compression Checker

Most checkers trust the Content-Encoding header or measure after automatic decompression. This one fetches the raw response bytes, decompresses with the matching algorithm, and compares true original size against true transferred size.

You get an honest savings report in bytes and percent, plus a verdict on whether compression is missing, weak, or working well. Perfect for verifying your CDN or server's Brotli claims.

Where it helps most

Reach for it after touching the delivery chain.

Post-config proof

Enabled compression in nginx or Apache and want proof it took effect on live traffic.

Host or CDN moves

Moved to a new host or turned on a CDN and need to confirm the edge is compressing.

Client site audits

Auditing a slow client site and suspecting the performance basics were skipped.

Algorithm choice

Brotli typically produces files 15 to 25 percent smaller than GZIP on text; knowing which your server negotiates tells you if a better option is one config line away.

Reading the result

What the results will not tell you.

Content-Encoding header

The check reads the Content-Encoding header and reports gzip, br for Brotli, or not compressed at all.

Document response

The check examines the document response; individual assets can theoretically differ on unusual setups.

Text game only

Images, fonts and video show as uncompressed even on a perfect setup, since they are already compressed.

GZIP/Brotli Compression Checker: built for trust

A live header check with a plain answer. The fix lives at the server or CDN level, never in your page code.

// GZIP/BROTLI COMPRESSION CHECKER · COMMON QUESTIONS

GZIP/Brotli Compression Checker FAQs

What is the difference between GZIP and Brotli?

Both compress text before it travels over the network, but Brotli is the newer algorithm and typically produces files 15 to 25 percent smaller than GZIP. The catch is that browsers only use Brotli over HTTPS, while GZIP works on plain HTTP too. For any HTTPS site, Brotli is the better choice when the server supports it.

Why does the checker say my images are not compressed?

My server supports GZIP but the checker reports none. Why?

How much faster does compression actually make a site?

Can I enable compression without access to the server?

tools-guide

How to Compress Images Online: Reduce File Size Without Losing Quality

Cut JPG, PNG and WebP file sizes by up to 80% with no visible quality loss. Here is how image compression works and how to do it free in your browser.

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