A "Page Size Checker" tool is a type of online tool that allows website owners or webmasters to check the size of their website pages. The tool measures the page size by calculating the total size of all the files that make up a particular web page, including HTML, CSS, JavaScript, images, videos, and other multimedia files.

The tool is designed to help website owners and webmasters optimize their web pages for faster loading times and better user experience. It provides them with insights into the page size, which is an important factor in determining the loading speed of a web page. A smaller page size can help a website load faster, which can improve user engagement and ultimately lead to better search engine rankings.

To use a Page Size Checker tool, users simply need to enter the URL of the web page they want to analyze. The tool will then scan the page and calculate its size in kilobytes (KB) or megabytes (MB). Some tools may also provide additional information, such as the number of requests made to the server, the load time, and the size of individual files.

Overall, a Page Size Checker tool is a useful tool for website owners and webmasters who want to optimize their web pages for better performance and user experience.