When a high-quality website suddenly stops ranking or experiences indexation drops, the root cause is almost always technical. Knowing how to do a technical SEO audit allows developers and founders to spot invisible blockers before they damage organic revenue.
In this guide, Mudassar Alk reveals the exact technical inspection framework used at SEO Ranker to diagnose enterprise WordPress, Shopify, Next.js, and custom PHP web applications.
Pro-Tip: Before making any edits, run a fresh crawl in Screaming Frog or Sitebulb and export your historical Google Search Console coverage logs.
Phase 1: Crawlability & Indexation Diagnostics
- Robots.txt Verification: Ensure high-value subdirectories (`/services/`, `/blog/`) are not accidentally disallowed via regex rules.
- XML Sitemap Health: Verify the sitemap contains only 200 HTTP status code URLs (no redirects, no 404s, no noindex pages).
- Canonical Tags: Confirm every page possesses a self-referencing canonical tag to prevent parameter duplicate URLs.
- Click Depth Architecture: Ensure no essential revenue page is buried deeper than 3 clicks from your homepage.
Phase 2: Core Web Vitals & Real-User Performance
Google's page experience signals directly influence mobile rankings. Audit the 3 core metrics in Google PageSpeed Insights:
- Largest Contentful Paint (LCP): Must load under 2.5 seconds. Optimize hero image compression, preconnect critical fonts, and leverage CDN edge caching.
- Interaction to Next Paint (INP): Replace legacy FID. Target under 200ms by minimizing long-running JavaScript execution on main threads.
- Cumulative Layout Shift (CLS): Maintain a score under 0.1 by reserving explicit width/height dimensions on images, embeds, and ad banners.
Phase 3: Schema.org JSON-LD Structured Data
Help Google extract structured meaning from your content. Validate your code with Google's Rich Results Test tool:
- `LocalBusiness` or `Organization` Schema on the homepage and contact page.
- `Service` Schema on individual service landing pages.
- `Article` or `BlogPosting` Schema on editorial articles.
- `BreadcrumbList` Schema across all nested subpages for cleaner SERP breadcrumbs.
Phase 4: HTTPS, Security & Mobile Experience
Ensure 100% SSL encryption with automatic HTTP to HTTPS 301 redirects, implement HSTS headers, and test for touch target usability on mobile devices (min 44x44px).