Free content structure tool
H1 and heading checker
Paste HTML, Markdown headings, or an H1–H6 outline to check hierarchy, skipped levels, and H1 use. The check runs privately and starts instantly in your browser.
Accepted formats: HTML heading tags, Markdown # headings, or labeled lines such as H2: Services.
Heading outline
5
headings found · 1 H1
One clear H1
One page-level heading
Logical hierarchy
Heading levels progress in order
Detected structure
5 headings found, including 1 H1 heading. Heading levels progress in order.
How to use the result
Give every page an understandable outline
Headings help readers scan a page and understand how its sections relate. A clear hierarchy usually begins with one descriptive H1, followed by H2 sections and H3 subsections where needed.
Heading levels communicate structure, while CSS controls visual size. Choose each level for its place in the page outline, then use CSS to create the intended appearance.
Frequently asked questions
Clear answers about this tool
Can a page have more than one H1?
HTML permits it, but one clear page-level H1 is usually the simplest, most understandable pattern for business websites.
Why should heading levels follow a logical order?
A logical sequence makes the document outline easier to follow, especially for assistive technology. Use levels to reflect the actual section hierarchy.
What formats can I paste into this checker?
The tool recognizes HTML H1–H6 tags, Markdown headings that begin with # symbols, and lines labeled like H2: Services.
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