📊 On-Page SEO Checker

🔍 Fetches the page and runs ~17 on-page SEO checks: title, meta description, headings, images, canonical, viewport, language, Open Graph, Twitter Card, structured data, indexability, content length, and more. Returns a weighted 0–100 score with per-check explanations.

The 17-Point On-Page SEO Technical Audit Framework

On-page search engine optimization encompasses all technical, semantic, and structural signals implemented directly within a webpage's HTML code to optimize discoverability, crawlability, and ranking potential.

Core On-Page Evaluation Signals

1. Semantic Heading Hierarchy (H1–H6)

  • Single Primary Heading (<h1>): Every indexable page should have exactly one <h1> that clearly defines the primary topic. Multiple H1 tags fragment page focus.
  • Logical Nesting: Major sections use <h2>, subsections use <h3>. Avoid skipping heading levels (e.g. going directly from H1 to H4 for aesthetic font styling).

2. Image Optimization & Web Accessibility

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  • Descriptive Alt Text: Describes visual content for screen readers (WCAG 2.1 accessibility) and search engine image indexing. Avoid stuffing raw keyword strings.
  • Explicit Dimensions: Declaring width and height attributes reserves layout space and prevents Cumulative Layout Shift (CLS).

3. Indexation & URL Directives

  • Canonicalization: Ensure an explicit Canonical URL points to the definitive page version.
  • Robots Directives: Verify that accidental noindex tags are not blocking search engines from indexing the page (audit with our Noindex Checker).

4. Internal & External Link Equity

Links form the crawl topology of the web:

  • Internal Links: Pass PageRank equity to related articles, creating topic clusters.
  • External Links: Cite authoritative reference materials (e.g. W3C, IETF RFCs) to establish factual trust signals.

Technical Meta & Social Graph Audit

In addition to visible content, on-page SEO requires verifying machine-readable tags:

  • Title & Description: Checked for pixel length and CTR appeal (see Meta Tags Checker).
  • Open Graph & Twitter Cards: Validated for social sharing previews (see Open Graph Checker).
  • JSON-LD Structured Data: Validated against Google Rich Result specifications (see Schema Validator).

Frequently Asked Questions

What is a good On-Page SEO score?

An on-page score of 80 or above indicates that all fundamental HTML signals (titles, headings, alt tags, canonicals, viewport, indexability) meet search engine best practices. Scores below 60 indicate missing metadata, broken heading structures, or missing image alt attributes.

How often should I audit on-page SEO?

Audit key landing pages and high-traffic articles after every site redesign, CMS migration, or template update to ensure automated scripts haven't removed meta tags or altered heading hierarchies.

Does on-page SEO include page load speed?

Yes. Page performance directly influences user bounce rates and Core Web Vitals rankings. Measure your response latency and asset sizes using our Page Speed Checker and Page Size Checker.