Every page you design sends signals to search engines, whether you plan them or not. The order of your headings, the words in your navigation, the size and description of your images, and the way content flows on the page all help a search engine decide what the page is about and which queries it might answer. On-page SEO is the practice of making those signals clear and honest. It is not a separate layer you add at the end. It lives inside the same decisions you already make about layout, typography, and hierarchy, which is why designers are so well placed to get it right.
Use a Clear Heading Hierarchy
Headings are the skeleton of a page. Give each page a single main heading that states its topic plainly, then use subheadings to break the content into logical sections in the order a reader would follow them. Avoid skipping levels or using a heading style just because it looks good, since that can confuse both readers and search engines. A clean hierarchy also helps people who skim, because they can grasp the page at a glance. When the outline reads like a sensible table of contents, the page is easier to understand for everyone.
The same principle applies to navigation and links. Link text should describe the destination in plain words, rather than relying on vague phrases such as click here. Descriptive links help visitors decide where to go, and they give search engines useful context about the linked page. Keep menus short and grouped by topic, so the most important pages are easy to reach from anywhere on the site. A structure that feels obvious to a first-time visitor usually reads clearly to a search engine as well.
Make Images and Text Work Together
Images are part of the message, not decoration alone. Choose file sizes that keep pages fast, write short descriptive alternative text for images that carry meaning, and give important images file names that reflect their subject. Alternative text also supports visitors who use screen readers, so it serves accessibility and search at the same time. Avoid placing essential information only inside an image, because text baked into a picture cannot be read as page content. When the words on the page and the images on the page tell the same story, both readers and search engines benefit.
Good on-page SEO is mostly good design discipline: a clear structure, honest wording, and fast, accessible pages. Once the basics are in place, the next gains often come from performance, so learn about improving Core Web Vitals through smarter design choices, and from organisation, so read about content structure that helps search rankings. Treat search visibility as a design quality to review on every project, not a checklist to rush through at launch, and your pages will serve visitors and search engines alike.