SEO UTILITIES
Page Size Checker — Measure HTML Download Size
Check the download size of a web page's HTML in kilobytes. A smaller HTML payload helps pages load faster, especially on slow mobile connections.
This tool fetches a URL and reports how many kilobytes its HTML document weighs — the raw markup the server sends before any images, scripts, or stylesheets load. Because the HTML arrives first and blocks rendering until it parses, a leaner document lets the page start displaying sooner, which matters most on slow mobile connections.
What this does and doesn't measure
It measures the HTML document only — not the images, CSS, JavaScript, or fonts the browser fetches afterwards. So a small HTML figure doesn't guarantee a fast page: heavy assets can still make it slow, and a full speed test gives the whole picture. Many well-built pages keep their HTML under roughly 100 KB; much larger usually means bloated inline markup or embedded data worth trimming.
One nuance: servers normally send HTML gzip- or brotli-compressed over the wire, so what actually travels to a visitor is often smaller than the raw markup you're measuring here.
Frequently asked questions
- My page feels slow but its HTML is small — why?
- Total load time is dominated by images, scripts, and third-party resources, none of which this tool weighs. A small HTML file can still pull in many large assets. Use a full page-speed test to see everything.
- Why care about HTML size at all, then?
- Because it's the first byte the browser needs and it blocks rendering until it arrives and parses. Trimming it is the cheapest early win, especially on connections where every kilobyte of that first payload costs time.