Heading Tag (H1-H6) Analyzer
Paste your HTML or article code to audit heading tag distribution, detect broken structural hierarchies, and export a clean document outline.
Document Heading Outline & Tree
What is the NexTools Heading Tag Analyzer?
The NexTools Heading Tag Analyzer is an SEO audit tool that scans HTML source code to evaluate the structure and semantic hierarchy of heading elements (<h1> through <h6>). Heading hierarchy serves as an essential architectural framework for search crawlers like Googlebot to understand the semantic focus of your content, while assisting screen readers in navigating documents for accessibility compliance.
Key Capabilities & Features
Strict H1 Verification
Verifies that your document contains exactly one primary H1 tag, flagging missing titles or multiple competing H1 headers.
Hierarchy Skip Detection
Instantly alerts you when heading levels are skipped improperly (e.g. going directly from an H1 to an H3 or H4 without an intervening H2).
Visual Indented Tree
Generates a clean visual outline showing parent-child relationships between sections, sections, and sub-clauses.
100% Client-Side Privacy
Parsing executes purely within your browser's local DOM parser. Unpublished drafts and internal company articles are never sent to remote servers.
Step-by-Step: Best Practices for SEO Heading Tags
- Single H1: Use a single H1 tag at the top of the page reflecting your primary targeted keyword.
- Logical H2 Sections: Divide your core arguments or categories into descriptive H2 subheadings.
- Nested H3 & H4 Details: Use H3 tags only under relevant H2 sections to elaborate on specific points.
- Avoid Decorative Headings: Never use heading tags purely for font size styling; use CSS classes instead.
Frequently Asked Questions
Does Google penalize sites with multiple H1 tags?
While Google's HTML5 parser can understand multiple H1s, SEO best practice strongly advises a single H1 per page to provide unambiguous topical focus and maximize search rankings.
What is an empty heading?
An empty heading occurs when a template outputs tags like <h2></h2> with no text inside. This harms accessibility and produces validation warnings.
Can I export the outline as a Table of Contents?
Yes! Click the "Copy Outline (Markdown)" button to receive an indented bulleted list perfect for pasting into blog posts or documentation.