Page Size Checker
Find out how heavy a web page is — HTML, CSS, JavaScript, images and fonts — and which files slow it down the most.
How to use the Page Size Checker
Enter a URL
Any public page.
We weigh every file
HTML plus all linked resources.
Speed it up
Largest files and quick wins first.
Why use our Page Size Checker?
Size breakdown
By type: HTML, CSS, JS, images, fonts.
Largest files
Sorted list of the heaviest requests.
Compression
Checks gzip / Brotli on the page.
Server response
Time to first byte and redirects.
Third-party
How much comes from other domains.
Tips
Specific ideas to make the page lighter.
Frequently asked questions
Everything you need to know about the Page Size Checker.
Back to the toolWhat is a good page size?
Under 1–2 MB loads well on mobile. The median web page is about 2.5 MB.
Why do some files show “unknown” size?
Some servers do not send a Content-Length header. Those files are counted as unknown.
Does this include files loaded by JavaScript?
No. It measures files referenced in the HTML. Scripts can load more files later.
How do I reduce page size?
Compress and resize images (WebP/AVIF), minify CSS/JS, enable Brotli or gzip and remove unused scripts.
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