Heading tags are HTML elements that define the hierarchical structure of your content — from the main title (H1) down through subheadings (H2, H3, H4). They serve two equally important purposes: helping users scan and navigate your content, and helping search engines understand what your page is about and how its topics relate to each other.

Getting heading tags right is one of the simplest and most impactful on-page SEO improvements you can make to any piece of content.

The H1 Tag — Your Page Title

The H1 tag is the most important heading on your page. Every page should have exactly one H1, and it should clearly describe the main topic of the page using your primary keyword.

The H1 is different from your HTML title tag (the text that appears in browser tabs and search result titles). They can be similar or identical, but they serve different purposes. The title tag is primarily for search engines and the SERP display. The H1 is primarily for users arriving on the page — it is the first thing they read after the page loads.

Key rules for H1 tags:

  • One per page only — multiple H1s confuse both users and search engines about the page's primary focus
  • Include your primary keyword naturally — forced keyword insertion reads badly and provides minimal benefit
  • Make it descriptive and compelling — it is the first text your visitor reads
  • Keep it concise — 50-70 characters is a good target

H2 Tags — Main Section Headings

H2 tags divide your content into its main sections. Each H2 should represent a distinct subtopic of the main subject defined by your H1. For a page about broken link building, your H2s might be: "What Is Broken Link Building", "How to Find Broken Link Opportunities", "How to Write Your Outreach Email", and "How to Scale Your Efforts".

H2s are where you naturally incorporate secondary keywords and related phrases. A user scanning your article sees the H2s first — they should collectively tell the story of what the article covers and allow users to jump to the section most relevant to them.

Use our keyword density checker to ensure your target keywords appear naturally across your H2 headings without over-optimisation.

H3 Tags and Beyond

H3 tags are subheadings within H2 sections. Use them when a main section is long enough to benefit from further subdivision. Do not use H3s just to add visual structure — only use them when they represent a genuine logical subdivision of the H2 section above them.

H4, H5, and H6 tags exist but are rarely needed for standard blog content. If you find yourself using H4s, it is usually a sign that your content structure needs rethinking rather than deeper nesting.

Common Heading Tag Mistakes

Using headings for styling rather than structure. If you are making text bigger or bolder by wrapping it in an H2 rather than using CSS, you are misusing heading tags and confusing search engines about your page structure. Use CSS for visual styling, heading tags for semantic structure.

Skipping heading levels. Going from H1 directly to H3 without an H2 breaks the logical hierarchy. Always use heading levels in sequence.

Keyword stuffing in headings. Headings like "Best SEO Tips SEO Guide SEO 2025" look spammy to both users and Google. Write headings for humans first.

Making headings too long. A heading that runs to three lines of text is not a heading — it is a paragraph. Keep headings tight and scannable.

Heading Tags and Featured Snippets

Well-structured heading tags significantly improve your eligibility for Google featured snippets. When Google sees a clear H2 question ("What Is Crawl Budget?") followed by a concise answer paragraph, it has everything it needs to display that content as a featured snippet. This directly connects to our earlier discussion of crawl budget — the heading structure that wins snippets is the same structure that makes content easy to crawl and understand.

Summary

Use one H1 per page containing your primary keyword. Use H2s for main section headings incorporating secondary keywords naturally. Use H3s only for genuine subsections within H2 sections. Write all headings for users first, search engines second. Check your keyword usage with our keyword density tool to ensure natural distribution across your heading structure.

Missed the previous article? Read: What Is Bounce Rate and Does Google Use It for Rankings?