format_size HTML Heading Checker
Inspect h1–h6 heading structure, hierarchy and SEO health of any HTML page or URL.
Proper heading structure (a single H1, followed by logically nested H2s, H3s, etc.) helps both search engines and screen reader users understand a page's content hierarchy. This tool inspects a page's H1-H6 headings and flags structural issues, like a missing H1 or skipped heading levels.
Frequently asked questions
Search engines use headings to understand what a page is about and how content is organized. Screen reader users often navigate directly by headings, so a logical, well-nested structure makes a page much easier to navigate non-visually.
Generally just one - the H1 should represent the main topic/title of the page, with H2s and lower levels breaking down subtopics beneath it.
It means jumping from, say, an H2 directly to an H4 without an H3 in between - this breaks the logical nesting hierarchy, which can confuse screen readers and make the content structure harder to follow.