Technical SEO Audit Checklist: 8 Things to Check on Every Site

Most sites don't lose rankings because of one dramatic mistake. They lose them to a slow accumulation of technical problems: pages Google can't crawl, templates shipping bloated JavaScript, redirect chains nobody remembers creating. A technical SEO audit is how you catch those problems before they compound, and a checklist is how you make the audit repeatable. This one covers the checks that matter, what a pass looks like for each, and how to prioritize what you find. If you want a head start, you can [run a free SEO audit](https://seodone.ai) and work through the results alongside this list. ## What a Technical SEO Audit Actually Covers Technical SEO is everything that affects how search engines access, render, and understand your site — as opposed to content quality or backlinks. A thorough audit checks three layers: **crawlability and indexation** (can Google find and store your pages?), **rendering and performance** (do pages load and display correctly?), and **comprehension** (does Google understand your structure and markup?). The checklist below moves through them in rough priority order. ## The Technical SEO Audit Checklist ### 1. Confirm Your Pages Are Crawlable and Indexable Start here, because nothing else matters if Google can't see your pages. - Search `site:yourdomain.com` to see roughly what's indexed, and compare it against what *should* be indexed. - Open robots.txt and confirm it isn't blocking important directories — this happens more often than you'd think after staging sites go live. - Inspect key pages for stray `noindex` tags left over from development. - Use URL Inspection in Google Search Console to see how Google actually renders individual URLs. ### 2. Hunt Down Broken Pages and Redirect Chains Crawl the site for 4xx and 5xx errors, then review your redirects. Every extra hop in a redirect chain adds latency and dilutes signals, so each redirect should resolve in a single hop. Just as important: update internal links to point directly at final URLs instead of quietly routing through redirects you set up years ago. ### 3. Clean Up Your XML Sitemap Your sitemap should be a curated list, not a dump of every URL: - Include only canonical, indexable URLs that return a 200 status. - Remove redirected, noindexed, and duplicate URLs. - Keep each sitemap file under 50,000 URLs and use a sitemap index if you need more. - Resubmit it after major changes and check the sitemap report in Search Console for errors. ### 4. Review Site Architecture and Internal Linking Important pages should be reachable within a few clicks of the homepage. Look for orphan pages — URLs sitting in your sitemap that nothing links to internally — and thin sections where a handful of links have to carry an entire category. Use descriptive anchor text; "click here" tells Google and users nothing. ### 5. Test Core Web Vitals and Page Speed Google evaluates Core Web Vitals using real user data at the 75th percentile, against these thresholds: - **LCP (Largest Contentful Paint):** 2.5 seconds or better - **INP (Interaction to Next Paint):** 200 milliseconds or better - **CLS (Cumulative Layout Shift):** 0.1 or less Common culprits are oversized hero images, render-blocking scripts, and layout shifts from late-loading fonts or ads. Before fixing anything, distinguish field data (real users) from lab data (simulated tests) — the [Core Web Vitals analysis](https://seodone.ai) in seodone.ai reports both, so you're not optimizing against synthetic numbers alone. ### 6. Resolve Duplicate Content and Canonical Issues Duplicates usually creep in through URL parameters, session IDs, and protocol or subdomain variants. Check that: - Every indexable page has a self-referencing canonical tag. - `http`, `https`, `www`, and non-`www` versions all resolve to one canonical host. - Parameterized URLs (UTM tags, filters, sort orders) are canonicalized consistently rather than left to compete with the clean versions. ### 7. Verify Mobile Rendering Google indexes the mobile version of your site, so audit on a real phone, not just a resized browser window. Confirm all content is present on mobile (watch for content parity gaps), fonts and tap targets are usable, and nothing critical fails to load on a throttled connection. ### 8. Validate Structured Data Schema markup helps Google understand what's on the page and can qualify you for rich results. Add types that match real content — Product, Article, FAQ, LocalBusiness, BreadcrumbList — and validate with the Rich Results Test. Only mark up content visible to users; markup describing hidden content violates Google's guidelines. ## How to Prioritize What You Find Not every issue deserves the same urgency. Fix in roughly this order: | Issue | Impact if unfixed | Typical effort | Fix first? | |---|---|---|---| | Indexation blockers (robots.txt, noindex) | Pages invisible in search | Low | Yes — immediately | | Broken pages and server errors | Wasted crawl budget, poor UX | Low–Medium | Yes | | Failing Core Web Vitals | Weaker rankings and UX | Medium–High | Yes, template by template | | Redirect chains | Slower pages, diluted signals | Low | Easy quick wins | | Duplicate content | Split signals, confusion | Medium | After the above | | Missing structured data | Missed rich results | Low–Medium | When convenient | ## Don't Stop at Traffic: The CRO Layer Technical fixes make your site findable; they don't automatically make it persuasive. Once pages load fast and rank, audit the conversion side too: clear calls to action, forms that don't fight the user, layouts that guide attention toward the next step. seodone.ai's [CRO analysis features](https://seodone.ai/features) flag friction points alongside the technical issues, so you're improving the full path from search result to signup — not just the ranking part. ## How Often Should You Run This Checklist? - **Quarterly** for most sites, to catch normal drift. - **Before and after any migration, redesign, or platform change** — non-negotiable. - **After unexplained traffic drops** or major changes to how Google handles indexing. Full manual crawls are thorough but slow, so a lightweight automated pass between deep audits helps you spot new problems while they're still small. ## Run Your Free Audit Working through this list by hand across every template, redirect, and script takes hours you probably don't have. Point the [free SEO audit tool](https://seodone.ai) at your domain and get a prioritized breakdown of crawlability, indexing, Core Web Vitals, and conversion issues in minutes — mapped to the checks above so you know exactly what to fix first. [Run your free audit now](https://seodone.ai) and turn this checklist into an action plan.