Free Website Grader & SEO Health Checker
Grade any webpage across critical search ranking metrics: Meta Titles, Descriptions, Open Graph tags, Canonical URLs, Heading hierarchy, and Image Alt coverage. Get an instant score and prioritized checklist of fixes.
What Is a Website Grader and What Does It Measure?
A website grader is an on-page technical SEO diagnostic engine that audits key structural elements that determine how search engines index and rank your pages. Rather than overwhelming you with vanity metrics, our grader focuses on core search crawler requirements: title tag character and pixel lengths, meta descriptions, viewport tags, Open Graph previews, heading hierarchy, and image accessibility.
Critical On-Page Factors Checked by Our Auditor
- Title Tag Optimization: Ensures your
<title>is between 30 and 60 characters so Google does not truncate it in desktop or mobile SERPs. - Meta Description Quality: Verifies descriptions fall within the 120-160 character sweet spot to maximize organic search CTR.
- H1 Heading Uniqueness: Confirms exactly one primary
<h1>tag exists per page to establish topical authority. - Canonical URL Verification: Checks that a valid
rel="canonical"tag exists to prevent duplicate content penalties. - Open Graph & Social Readiness: Audits Facebook and Twitter Card meta tags so posts render rich summary cards when shared.
- Image Alt Text Coverage: Detects missing
alt=""attributes that hurt accessibility and image search rankings.
Why Use ZeroCostAI's Website Grader?
- Direct HTML Source Mode: Audit localhost dev sites, staging environments, or behind-login pages without public deployment.
- 1-Click Actionable Advice: Clear pass/fail indicators with exact character counts and recommendation fixes.
- Instant Markdown Report: Export complete findings into GitHub issues, Notion docs, or client SEO proposals in one click.
- 100% Free & Private: Unlimited scans with zero signup walls or promotional email spam.
Frequently Asked Questions
Can a website grader improve my Google search rankings?
Yes. Fixing technical crawl obstacles—such as missing canonicals, truncated titles, or broken viewport tags—ensures Googlebot can correctly index your content and serve it to searchers.
Why do some websites score low on mobile readiness?
The most frequent error is omitting the <meta name="viewport" content="width=device-width, initial-scale=1.0"> tag, which forces mobile browsers to render desktop layouts at an unreadable scale.