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HTML Heading Outline Inspector

Analyze heading elements layout, check outline schema levels, check nesting structures, and debug heading issues for search engine optimization.

Size: 0 bytes
H1 0
H2 0
H3 0
H4 0
H5 0
H6 0

SEO Diagnostics & Warnings

Enter HTML source text to view structural validation warnings.

Heading Structure Outline

Document hierarchy tree map will be rendered here.
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About This Tool

Heading Inspector

Analyse the heading structure (H1–H6) of any webpage and instantly spot SEO issues with your heading hierarchy.

Why Use This Tool?

  • Check if a webpage has a proper H1–H6 heading hierarchy for SEO
  • Identify missing, duplicate, or misused heading tags on any site
  • Audit competitor websites for heading structure and keyword usage
  • Used by SEO professionals and content writers to optimise pages
  • Fix heading issues that negatively impact Google rankings

Overview

Heading tags (H1 through H6) are among the most important on-page SEO elements of any webpage. Search engines like Google use heading structure to understand the hierarchy and topic structure of your content, and proper use of headings significantly improves your page's relevance signals for target keywords. Many websites unknowingly have broken heading structures — multiple H1s, skipped levels (H2 directly to H4), no H1 at all, or headings used purely for visual styling rather than semantic meaning. Our Heading Inspector tool analyses the heading structure of any webpage URL and shows you a complete, visual map of all H1–H6 tags, their content, and any structural issues. This is an essential tool for SEO audits, content quality reviews, and technical SEO work. It helps you ensure that every page on your site has exactly one H1 (your primary topic), uses H2s for main sections, and progresses logically through the hierarchy.

How to Use

  • 1

    Enter the Webpage URL

    Type or paste the full URL of the webpage you want to inspect (e.g., https://yoursite.com/blog-post).

  • 2

    Click Inspect or Analyse

    Press the Inspect button to load and analyse the page's heading structure.

  • 3

    View the Heading Map

    See a visual tree of all H1–H6 headings on the page, indented by level to show hierarchy.

  • 4

    Check for Issues

    Look for warnings: missing H1, multiple H1s, skipped heading levels (e.g., H2 to H4), or very long heading text.

  • 5

    Fix and Re-test

    Make corrections to your webpage and run the inspector again to confirm the heading structure is clean and logical.

Frequently Asked Questions

Yes. SEO best practice and HTML5 specifications recommend a single H1 per page that clearly describes the page's primary topic. Multiple H1s can dilute your primary keyword signal.
You should not. Skipping heading levels breaks the logical document outline and can confuse both users and search engines about your content hierarchy.
Yes. Google uses heading structure to understand content hierarchy. Proper structure (H1 > H2 > H3) helps Google index your content correctly and improves relevance.
Your H1 should contain your primary keyword and clearly describe the page's main topic. It should appear once, near the top of the content.
Avoid this. Use CSS classes for visual styling. Heading tags carry semantic meaning — misusing them for decoration harms both accessibility and SEO.
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About This Tool

Heading Inspector

Analyse the heading structure (H1–H6) of any webpage and instantly spot SEO issues with your heading hierarchy.

Why Use This Tool?

  • Check if a webpage has a proper H1–H6 heading hierarchy for SEO
  • Identify missing, duplicate, or misused heading tags on any site
  • Audit competitor websites for heading structure and keyword usage
  • Used by SEO professionals and content writers to optimise pages
  • Fix heading issues that negatively impact Google rankings

Overview

Heading tags (H1 through H6) are among the most important on-page SEO elements of any webpage. Search engines like Google use heading structure to understand the hierarchy and topic structure of your content, and proper use of headings significantly improves your page's relevance signals for target keywords. Many websites unknowingly have broken heading structures — multiple H1s, skipped levels (H2 directly to H4), no H1 at all, or headings used purely for visual styling rather than semantic meaning. Our Heading Inspector tool analyses the heading structure of any webpage URL and shows you a complete, visual map of all H1–H6 tags, their content, and any structural issues. This is an essential tool for SEO audits, content quality reviews, and technical SEO work. It helps you ensure that every page on your site has exactly one H1 (your primary topic), uses H2s for main sections, and progresses logically through the hierarchy.

How to Use

  • 1

    Enter the Webpage URL

    Type or paste the full URL of the webpage you want to inspect (e.g., https://yoursite.com/blog-post).

  • 2

    Click Inspect or Analyse

    Press the Inspect button to load and analyse the page's heading structure.

  • 3

    View the Heading Map

    See a visual tree of all H1–H6 headings on the page, indented by level to show hierarchy.

  • 4

    Check for Issues

    Look for warnings: missing H1, multiple H1s, skipped heading levels (e.g., H2 to H4), or very long heading text.

  • 5

    Fix and Re-test

    Make corrections to your webpage and run the inspector again to confirm the heading structure is clean and logical.

Frequently Asked Questions

Yes. SEO best practice and HTML5 specifications recommend a single H1 per page that clearly describes the page's primary topic. Multiple H1s can dilute your primary keyword signal.
You should not. Skipping heading levels breaks the logical document outline and can confuse both users and search engines about your content hierarchy.
Yes. Google uses heading structure to understand content hierarchy. Proper structure (H1 > H2 > H3) helps Google index your content correctly and improves relevance.
Your H1 should contain your primary keyword and clearly describe the page's main topic. It should appear once, near the top of the content.
Avoid this. Use CSS classes for visual styling. Heading tags carry semantic meaning — misusing them for decoration harms both accessibility and SEO.
`; document.getElementById('htmlInput').value = demo; inspectHeadings(); showToast('Demo HTML outline loaded'); } function inspectHeadings() { const htmlText = document.getElementById('htmlInput').value; // Update sizes const sizeBytes = new Blob([htmlText]).size; document.getElementById('htmlLiveStats').innerText = `Size: ${sizeBytes.toLocaleString()} bytes`; const counts = [0, 0, 0, 0, 0, 0]; const diagnostics = []; const outlineContainer = document.getElementById('outlineContainer'); const diagContainer = document.getElementById('diagnosticsContainer'); if (!htmlText.trim()) { counts.forEach((c, idx) => { document.getElementById(`c${idx + 1}`).innerText = '0'; }); outlineContainer.innerHTML = `
Document hierarchy tree map will be rendered here.
`; diagContainer.innerHTML = `
Enter HTML source text to view structural validation warnings.
`; return; } // Parse headings const parser = new DOMParser(); const doc = parser.parseFromString(htmlText, 'text/html'); const headings = doc.querySelectorAll('h1, h2, h3, h4, h5, h6'); const headingsList = Array.from(headings).map(h => ({ tag: h.tagName.toUpperCase(), level: parseInt(h.tagName.substring(1)), text: h.innerText.trim() })); // Calculate Counts headingsList.forEach(h => { counts[h.level - 1]++; }); counts.forEach((val, idx) => { document.getElementById(`c${idx + 1}`).innerText = val; }); // Run Diagnostic Tests // 1. Missing headings if (headingsList.length === 0) { diagnostics.push({ type: 'error', message: 'No heading elements (H1-H6) were found in this source HTML code.' }); } else { // 2. H1 Count Checks const h1Count = counts[0]; if (h1Count === 0) { diagnostics.push({ type: 'error', message: 'Missing H1 tag. Web pages must include exactly one H1 tag describing the top-level topic.' }); } else if (h1Count > 1) { diagnostics.push({ type: 'warning', message: `Multiple H1 tags (${h1Count}) detected. SEO guidelines recommend restricting H1 tags to exactly one.` }); } else { diagnostics.push({ type: 'success', message: 'Excellent! Single H1 element detected.' }); } // 3. Document starts with H1 check if (headingsList[0].level !== 1) { diagnostics.push({ type: 'warning', message: `Hierarchy Outline starts with a ${headingsList[0].tag} rather than a master H1 tag.` }); } // 4. Nested hierarchy jumps and empty text check for (let i = 0; i < headingsList.length; i++) { const curr = headingsList[i]; if (!curr.text) { diagnostics.push({ type: 'warning', message: `Empty Heading detected: Tag <${curr.tag.toLowerCase()}> contains no text content.` }); } if (i > 0) { const prev = headingsList[i - 1]; const diff = curr.level - prev.level; if (diff > 1) { diagnostics.push({ type: 'error', message: `Sequence jump detected: <${prev.tag.toLowerCase()}> is directly followed by <${curr.tag.toLowerCase()}> (skipped levels).` }); } } } } // Render Diagnostics diagContainer.innerHTML = diagnostics.map(d => { let icon = 'alert-triangle'; let colorClass = 'text-amber-400'; let bgClass = 'bg-amber-500/10 border-amber-500/20'; if (d.type === 'error') { icon = 'shield-x'; colorClass = 'text-rose-400'; bgClass = 'bg-rose-500/10 border-rose-500/20'; } else if (d.type === 'success') { icon = 'shield-check'; colorClass = 'text-emerald-400'; bgClass = 'bg-emerald-500/10 border-emerald-500/20'; } return `
${d.message}
`; }).join(''); // Render Outline Tree if (headingsList.length === 0) { outlineContainer.innerHTML = `
No headings available in parsed source code.
`; } else { outlineContainer.innerHTML = headingsList.map(h => { const indentStyle = `margin-left: ${(h.level - 1) * 20}px;`; const badgeClass = `badge-h${h.level}`; return `
${h.tag} ${h.text ? h.text : '(Empty Heading)'}
`; }).join(''); } // Re-trigger Lucide Icons rendering lucide.createIcons(); } // FAQ Accordion document.querySelectorAll('.faq-question').forEach(function(btn) { btn.addEventListener('click', function() { var expanded = this.getAttribute('aria-expanded') === 'true'; document.querySelectorAll('.faq-question').forEach(function(b) { b.setAttribute('aria-expanded', 'false'); b.nextElementSibling.classList.remove('open'); }); if (!expanded) { this.setAttribute('aria-expanded', 'true'); this.nextElementSibling.classList.add('open'); } }); });