Glossaire · SEO

H1 Tag

The H1 tag is the HTML element that defines a web page's main heading, ranking highest in the hierarchy of heading tags (H1 through H6). In practice, it tells both visitors and search engines the central topic of the page through a clear, descriptive wording. A page should contain only one H1 tag, placed at the top of the visible content, and ideally include the primary targeted keyword. Distinct from the title tag (shown in the browser tab and the SERP), the H1 tag structures the content on the page itself. For Google as well as for AI answer engines, it acts as a strong relevance signal and helps clarify the page's context. A well-written H1 tag improves accessibility, user experience, and the page's ability to rank for its target query.

The H1 tag is often the first thing a visitor reads when landing on a page. It immediately announces what the page is about and shapes the decision to keep reading or leave. It is also one of the simplest on-page signals to optimize, yet frequently overlooked.

How it works

In HTML, the main heading is written <h1>Your heading</h1>. Search engines analyze this tag to understand the page's central theme, alongside the title tag and the content. The H1 opens a logical hierarchy: H2 tags follow for major sections, then H3 tags for subsections. This structure is part of semantic markup, which helps both crawlers and screen readers navigate the document.

Writing best practices

An effective H1 is unique on the page, descriptive and concise (ideally under 60 to 70 characters). It includes the primary keyword naturally, without stuffing. Avoid generic wording like "Welcome": favor a heading that precisely describes the content. The H1 should also remain aligned with the user's search intent.

Key takeaway

One H1 tag per page, descriptive, containing the primary keyword and aligned with search intent.

Why it matters

Beyond classic SEO, the H1 gains importance with AI answer engines. A clear heading makes it easier to extract citable passages: ChatGPT, Perplexity and AI Overviews rely on heading structure to identify a page's topic. A well-built H1 therefore strengthens both the relevance perceived by Google and citability by LLMs. At LUWIZ, we treat every H1 as an editorial promise that must hold across the entire page.

FAQ

Questions fréquentes

Technically yes, HTML5 allows it, but it is discouraged for SEO. A single H1 tag clarifies the page's main topic for search engines and avoids any hierarchical confusion.

No, they can differ. The title is optimized for clicks in the SERP, while the H1 serves context on the page. They should stay consistent but not necessarily identical.

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