URL Compression Check
See whether a URL serves gzip or brotli compressed content and how much bandwidth it saves.
Test a URL for compression
Enter the address of a page or file to see if it is sent out compressed.
How it works
Paste the URL
Enter the address of any public page or file you want to test.
Hit Check
We request the page and inspect the response headers and size.
See the result
View the compression method, sizes and the bandwidth you save.
About the URL Compression Check
The URL Compression Check is a web-based tool that inspects how a page or file is delivered and tells you whether the server sends compressed content. It detects compression applied through mod_gzip, mod_deflate, brotli or a server-side language, then compares the uncompressed and compressed sizes so you can see exactly how many bytes are saved on every request.
Compression is one of the simplest, highest-impact web performance wins available. By shrinking HTML, CSS, JavaScript and other text assets before they travel over the network, gzip and brotli reduce load times, lower bandwidth costs and improve Core Web Vitals — all of which contribute to a better user experience and stronger SEO. Use this tool to confirm compression is enabled on your site or to audit any third-party URL.
What you get
Compression status
Instantly see whether the URL is compressed or not.
Encoding method
Know exactly which method — gzip, deflate or brotli — is used.
Size comparison
Compare the original page size against the compressed size.
Potential savings
See the percentage of bandwidth compression saves.
Frequently asked questions
Is the URL compression test free?
What compression methods does it detect?
What does "Potential Savings" mean?
Why should my pages be compressed?
Maintained by the WizBrand team