How to Do a Complete On-Page SEO Audit

Why On-Page SEO Still Matters

The On-Page SEO Audit Checklist

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   Step 1: Title tag — the most important single element

   The title tag is the primary signal for what a page is about. It should be 30–60 characters (longer titles are truncated in SERPs), contain your primary keyword near the beginning (not the end), and be unique across all pages on your site. Formula: Primary Keyword — Secondary Keyword | Brand Name. Avoid duplicate title tags — a common problem on e-commerce sites where product variants get the same title. The SEO Analyzer flags title tags that are too long, too short, or missing.

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   Step 2: Meta description — your billboard in search results

   The meta description doesn't directly affect rankings, but it dramatically affects click-through rate from the SERP. Target 145–160 characters — shorter descriptions waste display space, longer ones get truncated. Include your primary keyword (Google boldens it in the snippet when it matches the query), a clear value proposition, and ideally a call to action. Every important page should have a unique meta description — pages without one get a snippet auto-generated from content, which is usually worse.

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   Step 3: Heading structure — H1 through H3

   Every page should have exactly one H1 tag containing your primary keyword. The H1 should be the first thing Google sees as the page's headline — it should match the title tag in intent (if not word-for-word). Use H2 tags for major sections and H3 tags for subsections. A flat structure (all H2 or no headings below H1) misses the opportunity to signal topical structure. A broken hierarchy (jumping from H1 to H3) is technically fine for SEO but confusing for assistive technologies.

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   Step 4: Content depth — word count and quality signals

   Pages under 300 words are often considered 'thin content' and may be manually reviewed or algorithmically demoted. For competitive topics, 600–1,500+ words is typically needed to cover the topic sufficiently. More important than raw word count is covering the topic comprehensively — Google's quality guidelines emphasize E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) and content that satisfies user intent fully. Use the keyword density analysis to see your top terms — your primary keyword should appear with 1–3% density.

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   Step 5: Image alt text — SEO and accessibility

   Every non-decorative image should have a descriptive alt attribute. Alt text serves two purposes: it tells Google what the image depicts (image search visibility), and it provides text alternatives for screen reader users (accessibility compliance). Good alt text describes what's in the image and includes a keyword naturally if relevant — avoid keyword stuffing. Images with empty alt attributes (alt='') are treated as decorative by screen readers and skipped by image search — use this only for truly decorative images.

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   Step 6: Technical signals — canonical, viewport, robots

   Canonical tag: prevents duplicate content issues by telling Google which URL is the authoritative version. Add one to every page. Viewport meta tag: required for mobile-friendliness — without it, Google's mobile crawler sees a desktop-only page and may apply mobile usability penalties. Robots meta tag: check that important pages aren't accidentally noindexed (a common CMS misconfiguration, especially on staging environments that get accidentally deployed). Structured data: JSON-LD schema markup can earn rich results in SERPs — Article, Product, FAQ, and HowTo schemas are the most common and valuable.

Frequently Asked Questions