What is On-Page SEO?

TL;DR

On-page SEO is everything you control directly on your own website to help it rank in search: the words, structure, links, and code on the page itself.

Off-page SEO is what happens elsewhere on the web that points back to you.

Examples of On-Page SEO

• Page titles and meta descriptions
• Heading hierarchy (one H1, supporting H2s and H3s)
• Keyword usage in body copy, written naturally
• Internal links between related pages
• Image alt text and optimized file sizes
• Clean URL slugs (/blog/on-page-seo instead of /blog?id=4823)
• Schema markup so search engines understand the page
• Page speed and Core Web Vitals
• Mobile responsiveness
• Content that actually answers the query

On-page vs Off-page

On-page lives on your site. You control it directly: titles, content, structure, internal links, speed, schema. The lever is quality and clarity.

Off-page lives everywhere else: backlinks from other sites, brand mentions, PR coverage, citations on Google Business. You influence it but don’t control it. The lever is authority and trust.

Both matter. On-page tells search engines what your page is about. Off-page tells them how much the rest of the web trusts you.

Why is On-Page SEO important?

• It’s the only SEO you fully control. You can’t make other sites link to you, but you can rewrite your own page tomorrow.
• It’s the foundation. No amount of backlinks or PR fixes a slow, badly structured page.
• It’s what AI search reads. ChatGPT, Perplexity, and Google AI Overviews extract answers from clear, well-structured on-page content. Win on-page, win the citation.
• It compounds with everything else. Strong on-page makes paid traffic convert better, helps content rank for more terms, and makes the off-page work you do worth more.

Though Google’s algorithm is always changing, Google will prioritize people-first content over other factors and to avoid search engine first.

Pro Tip: Use SEMrush’s On Page SEO Checker for actionable on-page SEO optimization ideas for your website.