Website Page Size Checker is one among many SEO tools that SEO Polarity has developed over the years. This awesome tool, as the name suggests, is a page size checker that can be used to find out the page size of a particular URL. It is a magical tool that users can use to check website size online. If your site takes longer than usual to load, you may need to work on the size of your site as this can lead to a high bounce rate as people tend not to have the patience to wait for the page. open web. The average web page size is estimated to be around 12KB and will load very quickly. The more media there is on a page, the larger the page size and the slower it loads. Integrating video, images, audio, graphics, flash and other media will increase your page size. First of all, it is important for the health and performance of your website that you know the size of your website, but how do you know the total size of a website? This is where the website size checker or page size checker comes in.