Lighthouse 100: How to Audit Your Meta Tags for SEO

Google Lighthouse is the industry-standard tool for auditing web page quality. The SEO category specifically checks how well your page is optimized for search engine discovery. Here’s how to nail a perfect 100.

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What Lighthouse SEO Checks

The SEO audit category evaluates these key areas:

Check	What It Tests
Document has a <title>	Page has a title element
Document has a meta description	<meta name="description"> exists
Page has successful HTTP status	No 4xx/5xx responses
Links have descriptive text	No “click here” anchor text
Document has valid hreflang	Correct language alternates
Document has valid robots.txt	Crawlers can access the page
Image elements have alt text	Accessibility + SEO
Document uses legible font sizes	Text is readable on mobile
Tap targets are sized appropriately	Touch-friendly clickable areas

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The Meta Tags Checklist

1. Title Tag

Your <title> is the single most impactful on-page SEO element.

Rules:

• Keep between 30–60 characters
• Include your primary keyword near the front
• Make each page title unique across the entire site
• Don’t stuff keywords — write for humans

<!-- ✅ Good -->
<title>Open Graph Generator — Free Meta Tag Preview Tool</title>

<!-- ❌ Bad: Too long, keyword-stuffed -->
<title>Free Open Graph Generator Tool for Meta Tags OG Tags Social Media Preview Generator 2026</title>

2. Meta Description

The meta description appears as the snippet below your title in search results.

Rules:

• Keep between 120–160 characters
• Include a clear call-to-action or value proposition
• Avoid duplicate descriptions across pages
• Don’t use quotes (they get truncated in SERPs)

<meta name="description" content="Generate and preview Open Graph meta tags for 8+ social platforms. Free, real-time, no signup required." />

3. Canonical URL

Canonical tags prevent duplicate content penalties when the same page is accessible via multiple URLs.

<link rel="canonical" href="https://opengraphgenerator.com/blog/lighthouse-meta-audit" />

4. Robots Meta Tag

Control indexing behavior per page:

<!-- Default: index and follow all links -->
<meta name="robots" content="index, follow" />

<!-- Block indexing of utility pages -->
<meta name="robots" content="noindex, nofollow" />

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Heading Structure

Lighthouse doesn’t explicitly audit heading hierarchy, but Google’s guidelines are clear:

1. One <h1> per page — should match the topic of the title tag
2. Don’t skip levels — go from <h1> → <h2> → <h3>, not <h1> → <h3>
3. Use headings for structure, not for styling

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Common Failures and Fixes

Duplicate Titles Across Pages

Symptom: Multiple pages share the same <title>.

Fix: Use a templated approach in your framework:

<title>{pageTitle} — {siteName}</title>

Missing Alt Text on Images

Symptom: <img> elements without alt attributes.

Fix: Add descriptive alt text to every image. For decorative images, use an empty alt:

<img src="photo.jpg" alt="Screenshot of the Open Graph Generator tool" />
<img src="divider.svg" alt="" role="presentation" />

Non-Descriptive Link Text

Symptom: Links that say “click here” or “read more”.

Fix: Make the link text describe the destination:

<!-- ❌ Bad -->
<a href="/blog/og-guide">Click here</a>

<!-- ✅ Good -->
<a href="/blog/og-guide">Read the Open Graph guide</a>

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Running the Audit

In Chrome DevTools

1. Open DevTools → Lighthouse tab
2. Select SEO category
3. Choose Mobile device (Google uses mobile-first indexing)
4. Click Analyze page load
5. Review the results and address each failing audit

Via Command Line

npx lighthouse https://your-site.com --only-categories=seo --output=json

In CI/CD

Integrate Lighthouse CI into your deployment pipeline to catch regressions:

npx @lhci/cli autorun --collect.url=https://your-site.com

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Beyond Lighthouse

A perfect Lighthouse score is the floor, not the ceiling. Also consider:

• Structured data (JSON-LD) for rich results
• Open Graph tags for social sharing previews
• Core Web Vitals for ranking signals
• XML sitemaps for discovery

Use our Open Graph Generator to validate your social meta tags alongside your SEO audit.