HTML Heading Structure & Hierarchy Checker

Content & Audit • 100% Client-Side Processing

Heading hierarchy auditor for SEO and accessibility. Scans HTML to ensure a single <h1> tag exists and flags skipped levels (e.g. jumping from <h2> directly to <h4>).

Privacy First: HTML Heading Structure & Hierarchy Checker executes 100% locally in your web browser. No inputs or generated outputs leave your device.

Zero Server Transmission

Input Data

Output Result

Tool Chaining — Continue Workflow

Take your result from HTML Heading Structure & Hierarchy Checker directly into companion utilities:

Word, Character, Sentence & Paragraph Counter Image Alt Attribute SEO & Accessibility Checker

How to Use

Paste HTML code.
Inspect ordered list of headings.
Review any flagged structural issues.

Key Features

•Checks for single <h1> per page
•Detects skipped hierarchy levels
•Displays complete document outline

Technical Scope & Limitations

• Audits HTML markup; does not render CSS-hidden headings differently.