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Web Page Size Checker

Measure how heavy a page is: the HTML document, the total transfer size of its files, the number of requests and the largest files.

Fetching and analysing the page…

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Web Page Size Checker - results and guide

What the Web Page Size Checker checks

  • Size of the HTML document, raw and as transferred
  • Estimated total page weight, from the size of each file
  • Number of requests, by type: CSS, JavaScript, images and fonts
  • The 15 largest files
  • Whether the HTML is compressed
  • Inline CSS and JavaScript, and the number of HTML elements

What is page size?

Page size, or page weight, is the number of bytes a browser has to download to show a page: the HTML document plus its stylesheets, scripts, images and fonts. The median web page today is a little over 2 MB, and images and JavaScript account for most of it.

Weight is not the same as speed, but the two are closely tied. Every byte takes time on a slow connection, and every script has to be parsed and run after it arrives. A phone on a weak signal feels the difference between 1 MB and 4 MB as seconds.

How big should a page be?

There is no fixed limit. As working targets: keep the HTML document under about 150 KB, the whole page under 1.5 MB, and the request count under 50. Google reads only the first 15 MB of an HTML file, which matters only for extreme cases, but a large document slows parsing long before that.

This tool measures the files referenced in the HTML. Files requested later by JavaScript, background images set in CSS and fonts loaded from stylesheets are not included, so a browser's network panel will show a somewhat higher total. Images are usually the easiest saving: see the Responsive Image Checker and the Lazy Loading Images Checker.

How to use the Web Page Size Checker

  1. Enter the address of the page you want to check. You can leave out https://.
  2. Press Measure page. The page is fetched from our servers, the way a search engine crawler would fetch it.
  3. Read the findings from top to bottom: problems first, then warnings. Each one says what to change.

Common problems and how to fix them

Images dominate the page weight

Resize images to the size they are displayed at, convert them to WebP or AVIF, and lazy-load those below the first screen.

Too many JavaScript files

Remove unused libraries and plugins, bundle what remains, and load third-party tags only on the pages that need them.

The HTML document is very large

Look for inlined JSON data, base64 images, giant navigation menus and long lists. Paginate lists and move data to separate requests.

Frequently asked questions

What is a good page size?
Under about 1.5 MB in total is comfortable on mobile. Many fast sites are well under 1 MB.
Does page size affect SEO?
Indirectly. Heavier pages load more slowly, and loading speed feeds into Core Web Vitals, which are a ranking signal.
Why is the total lower than in my browser?
Files added by JavaScript after load, CSS background images and web fonts requested by stylesheets are not in the HTML, so they are not counted here.
What is transfer size?
The number of bytes sent over the network after compression. It is what affects loading time, and it is smaller than the uncompressed size for text files.

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