Performance Tools
Page Size Checker
Check the HTML response size of a website's homepage.
Enter a domain to check the size of its HTML response. This measures the HTML document only, not linked CSS, JS, or images.
Measures the HTML response only - does not fetch linked CSS, JS, or images.
JustChecker tracks your website's performance signals continuously.
Frequently Asked Questions
This checks the size of the initial HTML document response specifically, not the total weight of every image, script, and stylesheet the page subsequently loads - it's one component of overall page weight, not the complete picture.
Under 100KB is generally lean; pages growing well beyond that (especially with a lot of inline styling or scripts embedded directly in the HTML) are worth reviewing for opportunities to externalize and cache that content separately instead.
Common causes include large amounts of inline CSS/JavaScript embedded directly in the page, excessive inline SVG code, or a page listing very large amounts of content (product listings, long articles) without pagination.
This measures the uncompressed HTML size; the actual bytes transferred over the network would typically be smaller if compression is enabled, but the underlying document size still affects browser parsing and rendering time regardless of transfer compression.
Page size isn't a direct ranking factor on its own, but it strongly correlates with faster load times, which do factor into page-experience signals search engines increasingly weigh.