On-Page SEO

On-page SEO covers everything you can directly control on a webpage. The signals that tell search engines what a page is about, why it deserves to rank, and whether it satisfies the query a user typed.

What is on-page SEO?

On-page SEO is the practice of optimising individual web pages to rank for the queries you care about. Off-page SEO depends on how the rest of the web behaves; on-page SEO is entirely yours to shape.

The discipline splits into two layers. The first is technical markup: title tags, meta descriptions, canonicals, headings. The second is the content itself: what you say, how you organise it, and how closely it matches what searchers want to find.

Core on-page SEO elements

These split into two layers: the content itself, and the page elements and metadata around it.

Content and structure

• Content depth. Thin pages rarely rank for competitive terms. In-depth, accurate content that answers the query performs better.
• Heading hierarchy. An H1 that reflects the topic, with H2s and H3s creating a logical structure for readers and crawlers.
• Internal linking. Distributes PageRank across your site and gives crawlers a map of what matters.
• E-E-A-T. Experience, Expertise, Authoritativeness, Trustworthiness. The signals that show real expertise behind the writing, on-page and off it.

Page elements and metadata

• Title tags. A strong on-page relevance signal. Every page needs a unique, descriptive title; the familiar 60-character limit is a display and rewrite-risk convention, not a ranking rule.
• Meta descriptions. Not a direct ranking factor, but a primary lever for click-through rate from the SERP.
• URL structure. Clean, descriptive URLs reinforce topical relevance and improve usability.
• Image SEO. File names, alt text, modern formats, and lazy loading. Helps both search visibility and accessibility.
• Favicons in search results. The small square image Google shows beside your result and next to AI Overviews citations. Seven supported formats, and SVG is not one of them.
• Site names. The name Google shows above every result from your site, stated with WebSite structured data on the home page, and why Google sometimes shows the domain instead.
• Meta keywords. The tag Google has ignored since at least 2009, what still reads it, and whether to remove it.
• Open Graph and social meta tags. The og: and twitter: tags that control how pages appear when shared on social platforms and messaging apps.

Why does on-page SEO matter?

No volume of links will rescue a page that fails to communicate its topic to a search engine. On-page optimisation is the foundation everything else builds on, and it is the cheapest, fastest area of SEO to improve.

Search intent is the mechanism. Google’s own account of ranking starts with “the intent behind your query” and then relevance, with the weight of each factor varying “depending on the nature of your query”,¹ which means a page that matches what a searcher wants will outperform a technically polished page that doesn’t.

On-page SEO and AI search

Google describes its AI features retrieving pages from its index and using “the specific information from those retrieved pages”, and says in the same guide that there is no need to chunk content for them.² The one measured effect is position: a 2025 benchmark found the embedding models that do first-pass passage matching lost 15.6% of retrieval performance when the relevant information sat later in the passage.³ A section that opens with its answer is easier to retrieve than one that buries it; heading shape and list formatting are for the reader, and Google’s own reason for structure is that people “appreciate” pages organised by sections and headings.²

This shift makes on-page SEO more consequential. The same patterns that make content extractable for AI also make it scannable for humans.

On-page SEO and E-E-A-T

Google’s search quality rater guidelines treat Experience, Expertise, Authoritativeness, and Trustworthiness as central to content quality, and Google’s systems aim to reward the qualities they describe, though E-E-A-T is not itself a ranking factor. On-page work owns the visible half of it: author attribution, citations, publication dates, accuracy, and the depth of demonstrated knowledge. The other half is independent reputation earned off your own site, in reviews and coverage a rater is trained to go and find. Pages without the visible markers compete from a weaker position regardless of how well the technical fundamentals are in place.

Footnotes

1. Ranking results — How Search Works, Google ↩

2. Optimizing your website for generative AI features on Google Search — Google Search Central ↩ ↩²

3. An Empirical Study of Position Bias in Modern Information Retrieval — Zeng et al., arXiv 2505.13950 (EMNLP 2025 Findings). Beijing University of Posts and Telecommunications with the NovaSearch team; two constructed benchmarks, not a live engine; the 15.6% average drop covers dense embedding and ColBERT-style late-interaction models. ↩