Analyze total page weight, number of requests, and resource breakdown by type (JS, CSS, images, fonts).
Enter a URL and this tool loads the page the way a browser would, then adds up everything that had to be downloaded: the document, scripts, stylesheets, images, and fonts, both first-party and third-party. You get a total byte count, a request count, and a breakdown showing which resource type dominates the weight. The result is usually a surprise: the figure includes analytics, ad scripts, and CDN fonts you never wrote, so it is almost always far larger than the sum of your own files. Sizes reflect what was transferred, which is typically the compressed size, not the size on disk.
The tool requests the URL as your browser would, with your cookies and cache. Every resource the page fetches afterward, including scripts, stylesheets, images, fonts, and third-party embeds, is recorded with its byte count and type, and the totals are summed. The page is measured once per check, so lazy-loaded content that appears only after scrolling may not be fetched, and cached resources may be served without a full download.
Each recorded resource is assigned to a bucket: JavaScript, CSS, images, fonts, and the document itself, typically decided by MIME type or file extension. The size shown is usually the transfer size, which for text-based files means the gzip- or Brotli-compressed version, not the unpacked file on disk. This is why a page whose source files total hundreds of kilobytes can report a much smaller wire weight.
Because the page you load is not just your files. Analytics, ad scripts, social widgets, and fonts served from CDNs all download with it, and the tool counts every one of them. The breakdown by type usually makes the cause visible at a glance: a large scripts or images bucket you did not author.
A page behind a login is measured only in whatever state the checker can reach it. If the checker does not carry your session, you get the logged-out version, which may differ from what your users load. Verify sensitive cases with your own browser's devtools network panel.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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