It is not the same as on-site SEO or off-page SEO. On-Page SEO vs On-Site SEO“On-page” focuses on a single page, while on-site SEO coordinates the optimization of an entire website. For example, you can analyze quickly on-page SEO with the Detailed SEO Extension. If it is, you’ve handled a large part of on-page SEO. Once again, on-page SEO is isolated at the page level.