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SEO On-Page Audit

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Audit any webpage's SEO in seconds — free

Free alternative to Ahrefs / SEMrush ($29-130/mo)

Paste Your Page HTML

Paste the full HTML source of any webpage to get a comprehensive SEO audit. Right-click any page, select "View Page Source", copy all, and paste below.

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Frequently Asked Questions

What does it check?

Meta title/description, heading hierarchy, image alt tags, canonical URL, OG tags, schema markup, and internal/external links.

Is it as good as Ahrefs?

It covers on-page SEO checks. It doesn't include backlink data or keyword research, which require large crawl databases.

How does the URL fetching work?

We fetch the page via a serverless proxy to avoid browser CORS restrictions. Your URL is not stored.

How SEO On-Page Audit Works

The SEO On-Page Audit tool analyzes any web page and provides actionable recommendations for improving search engine visibility. It checks the elements that matter most for on-page SEO: title tags, meta descriptions, heading hierarchy, image alt text, internal linking, schema markup, and Core Web Vitals indicators.

Unlike paid tools like Ahrefs or SEMrush that cost $29-130 per month, this tool focuses specifically on on-page factors you can fix immediately. It doesn't just flag issues — it explains why each element matters and provides specific fix suggestions with example code where applicable.

The audit evaluates your page against current Google Search quality guidelines and structured data requirements. It checks whether your schema markup is valid, whether your heading structure creates a logical content hierarchy, and whether your meta tags are optimized for both click-through rate and keyword relevance. The tool also flags common technical issues like missing canonical tags, broken internal links, and render-blocking resources.

For content creators who also use AI in their workflow, combine this with the AI Disclosure Label Generator to ensure compliance labels don't interfere with SEO. If you're previewing how optimized content appears in social shares, the Social Media Post Preview tool shows you exactly how your meta tags render on each platform.

Key Terms Explained

Schema markup
Structured data code (usually JSON-LD) that helps search engines understand page content and can trigger rich results in search.
Core Web Vitals
Google's metrics measuring real-world user experience: loading speed (LCP), interactivity (INP), and visual stability (CLS).
Canonical tag
An HTML element that tells search engines which URL is the preferred version when duplicate or similar content exists at multiple URLs.
Heading hierarchy
The logical nesting of H1-H6 tags that communicates content structure to both users and search engine crawlers.
Alt text
Descriptive text for images that improves accessibility for screen readers and helps search engines understand image content.
Meta description
A 150-160 character HTML attribute summarizing page content, often displayed as the snippet in search engine results.

Who Needs This Tool

Small business owner

Auditing a local business website before launch to catch SEO issues without hiring an expensive consultant or paying for enterprise tools.

Freelance blogger

Checking each new post against SEO best practices before publishing to maximize organic traffic potential.

E-commerce manager

Auditing product pages to ensure schema markup for pricing, availability, and reviews is correctly implemented for rich snippets.

Web developer

Running technical SEO checks on a client site rebuild to verify no critical SEO elements were lost in the migration.

Content marketing team

Batch-auditing 50 top-traffic pages quarterly to identify optimization opportunities and prevent ranking drops.

Methodology & Formulas

The audit scores pages across five categories: metadata quality (title, description, canonical), content structure (headings, word count, keyword usage), technical SEO (schema validity, mobile-friendliness, page speed indicators), link health (internal links, anchor text diversity), and media optimization (image alt text, file sizes, lazy loading). Each category is scored 0-100 based on weighted criteria derived from published Google documentation and ranking factor correlation studies. The overall score is a weighted average with technical SEO and content structure weighted highest.

Pro Tips

  • Audit your page in both mobile and desktop mode — Google uses mobile-first indexing, so mobile issues impact rankings more than desktop ones.
  • Fix heading hierarchy issues first; a proper H1 > H2 > H3 structure is one of the highest-impact, lowest-effort SEO improvements.
  • Add FAQ schema markup to pages targeting question-based keywords — it can significantly increase your SERP real estate.
  • Check that your meta description includes a call-to-action; while it doesn't directly affect rankings, it dramatically improves click-through rates.
  • Re-audit pages 2 weeks after making changes to verify fixes are properly indexed and didn't introduce new issues.
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