About

The Header Analyzer is a diagnostic tool designed to evaluate the hierarchical structure of a web page's content. Search engines and screen readers rely heavily on HTML header tags (H1 through H6) to understand the context and importance of different sections. A logical header structure improves SEO rankings by defining clear parent-child relationships between topics.

This tool parses raw HTML code to extract the header outline. It flags common semantic errors, such as the use of multiple H1 tags (which dilutes the main keyword focus), missing header levels (e.g., jumping from H2 to H4), or empty tags. Correcting these issues ensures your content is machine-readable and user-friendly.

Formulas

The analyzer evaluates the Document Object Model (DOM) structure based on sequential logic:

Step 1. Extract all tags matching <h[1-6]> via Regex/DOM parsing.
Step 2. Check H1 Uniqueness: Count(H1) must equal 1.
Step 3. Validate Linear Hierarchy: If current is H(n) and next is H(n+k), then k should not be > 1 (e.g., H2 to H4 is a skip error).

Reference Data

Tag	Semantic Role	SEO Best Practice
<H1>	Main Page Title	Only 1 per page. Contains primary keyword.
<H2>	Major Section	Divides content into thematic blocks.
<H3>	Subsection	Details within an H2 block.
<H4>-<H6>	Deep Structure	Used for granular details; rarely affects macro SEO.

Frequently Asked Questions

Skipping levels breaks the semantic outline of the document. Search engines may view the content as disjointed or poorly structured. For accessibility, screen reader users navigate by headers; skipping levels can confuse them regarding the context of the information.

Technically, HTML5 allows multiple H1s if they are inside distinct <article> or <section> tags. However, most SEO experts and Google guidelines recommend a single H1 per page to clearly signal the primary topic of the URL.

This tool analyzes the static HTML source code you paste. If your headers are generated dynamically by Client-Side Rendering (CSR) after load, you should inspect the rendered DOM and paste that HTML here.