The Technical SEO Checklist: 15 Fixes That Move Rankings
A prioritised, actionable checklist of the 15 technical SEO issues that show up most consistently in audits and move the needle fastest when fixed — with specific instructions for each.
Technical SEO audits keep finding the same problems. Look across hundreds of small-business sites. The issues that block rankings fall into a short, predictable list. So you do not need a custom 200-point audit. You need this technical SEO checklist of 15 fixes. Work through them in order. Use free tools any site owner can get. This is not a full crawl of every possible issue. It is the ranking-moving list. These fixes give you the most improvement per hour of work.
Before you start, set up Google Search Console. It is free. Submit your XML sitemap if you have not yet. Search Console feeds data to eight of the fifteen checks below. So set it up first. The data turns this checklist from guesswork into clear priorities.
Crawl and indexing checks (items 1-5)
These five checks make sure Google can find your pages. They also let Google access and index them. Content and links do not matter if these basics are broken.
1. Indexing coverage audit: go to Google Search Console → Index → Pages. Compare the "Indexed" page count to your real page count. Then review every "Not indexed" reason. Look for "Crawled - currently not indexed" (a content quality issue). Look for "Discovered - currently not indexed" (a crawl budget or priority issue). Look for "Blocked by robots.txt" (an accidental crawl block). Fix any accidental blocks first. They are often the easiest, highest-impact fix.
2. Robots.txt check: visit yourdomain.com/robots.txt and read it. Make sure it blocks no directory you want Google to crawl. One common mistake is adding "Disallow: /" during development. People forget to remove it. That blocks Google from crawling the whole site.
3. Accidental noindex tags: crawl your site with Screaming Frog SEO Spider (free up to 500 URLs). Filter by meta robots. Any unwanted "noindex" page is costing you rankings. Check this after CMS updates and plugin changes. They often add or change meta robots tags.
4. XML sitemap health: your sitemap should list every page you want indexed. It should list no pages you do not. It should list no redirect URLs. Sitemaps should hold only canonical, live 200-status URLs. Validate your sitemap at xml-sitemaps.com. Then check Search Console's Sitemap report for errors.
5. Orphaned pages check: pages with no internal links often get missed in Google's crawl. Use Screaming Frog's "Orphan Pages" report to find them (Configuration → Spider → Check orphan pages). Every important page needs at least one contextual internal link. That link must come from an indexed page.
Performance checks (items 6-8)
These three checks cover user experience signals you can measure. Google uses these signals directly as ranking factors.
6. Core Web Vitals field data: open Search Console → Experience → Core Web Vitals. Count the URLs in the "Poor" and "Needs improvement" buckets. Check both mobile and desktop. Run every failing URL group through PageSpeed Insights (pagespeed.web.dev). It gives you specific fixes. Fix mobile first. Google weights mobile scores more under mobile-first indexing. See Core Web Vitals explained for the full breakdown.
7. Image optimisation: images are the top cause of poor LCP scores. Check your five most-visited pages with PageSpeed Insights. In the Opportunities section, look for "Properly size images." Look for "Serve images in next-gen formats." Look for "Efficiently encode images." Convert PNG and JPEG files to WebP. Add explicit width and height to every image. Turn on lazy loading for below-the-fold images.
8. Time to First Byte (TTFB): test your homepage TTFB with WebPageTest.org. Pick a test location near your server. A TTFB under 800ms is good. Over 1500ms points to hosting or caching problems. Common fixes help here. Move from shared hosting to a VPS or managed host. Turn on server-side caching. Options include LiteSpeed Cache for WordPress, Varnish, or a CDN like Cloudflare. TTFB is the most direct server-side fix. It affects every page on your site at once.
Mobile and HTTPS checks (items 9-10)
These two checks are baseline requirements. You cannot skip them and rank well in 2026.
9. Mobile usability: open Search Console → Experience → Mobile Usability. Check for any URLs with errors. Common errors include text too small and clickable elements too close. Others include content wider than the screen and a viewport that is not set. Fix every flagged item. Then test your three most important pages. Use Google's Mobile-Friendly Test (search.google.com/test/mobile-friendly). See mobile-friendly website SEO for the full implications.
10. HTTPS and mixed content: confirm your site serves only over HTTPS. Then check for mixed content. That means HTTP resources loaded on HTTPS pages, such as images, scripts, or CSS. Use Chrome's security panel to find it (Inspect → Security → View certificate). Or use the free tool Why No Padlock (whynopadlock.com). Mixed content can trigger a "not secure" warning in Chrome. It can also suppress the full HTTPS ranking benefit.
The best technical SEO audit takes about two hours with free tools. Most ranking problems are not subtle. They show up in Search Console as clear errors. They show up in PageSpeed Insights as failing scores. They show up in Screaming Frog as red rows in a spreadsheet.
Structured data and on-page technical checks (items 11-13)
These checks improve how Google understands your content. They also improve how Google surfaces it in search results.
11. Schema markup validation: use Google's Rich Results Test (search.google.com/test/rich-results). Run it on your homepage, a service page, and a blog post. Confirm each page has the right schema. Use LocalBusiness, FAQPage, and Article or BlogPosting in that order. Make sure Google shows "eligible for rich results," not just "valid." Fix any errors it flags. See what is schema markup for implementation guidance.
12. Canonical tag audit: run Screaming Frog and export all canonical tags. Every page should have a self-referencing canonical tag. That tag should point to its own URL. Some tags point to the wrong URL. Some pages have no canonical tag at all. Both create duplicate content confusion. Both can dilute your ranking authority.
13. Title tags and meta descriptions: crawl your site with Screaming Frog. Check for missing title tags and duplicate title tags. Check for title tags over 60 characters, since they truncate in search results. Check for missing meta descriptions. Every page that can earn organic traffic needs a unique title tag. That tag must contain the keyword. The page also needs a compelling meta description. Missing or duplicate title tags are one of the most common quick wins.
Architecture and redirect checks (items 14-15)
These final two checks address authority flow. They also address URL health across your site.
14. Redirect chain audit: Screaming Frog's Redirect Chains report finds pages that redirect through several hops (301 → 301 → final destination). Each hop loses some link equity. Collapse chains to single direct redirects wherever you can. Also check for redirect loops. A loop is a URL that redirects to itself. It can also redirect to a URL that points back to it. Loops stop the affected pages from being crawled and indexed.
15. Internal link depth and anchor text: export your full site crawl from Screaming Frog. Sort by "Crawl Depth." Pages more than four clicks from the homepage need better internal linking. Add them to an existing high-authority page. Or link to your top commercial pages from the homepage or main navigation. At the same time, check the links to your most important pages. Their anchor text should be descriptive and keyword-relevant. Avoid "click here" or "read more." Internal linking strategy covers this in full depth.
How often should you run this checklist?
Run the full checklist at least once every six months. Also run it right after any major site change. That includes a redesign or a platform migration. It includes a new plugin or a content audit that removes or rewrites pages. Technical SEO drifts over time. Plugins update and add noindex tags. Redirects pile up and form chains. Images get uploaded without optimisation. A twice-a-year audit catches these issues early. It stops them before they cause big ranking losses.
Which item on this list moves rankings fastest?
It depends on what is broken. Say you have accidental noindex tags or robots.txt blocks (items 2-3). Fixing those can restore rankings in days, once Google re-crawls the pages. Say you have Core Web Vitals failures (item 6) and your competitors pass. Better scores move rankings in four to six weeks, as field data updates. Say you have missing title tags (item 13). Google re-processes those fast, sometimes within two to three weeks. In general, fix any discovered or indexed blockers first (items 1-5). Then fix performance (items 6-8). Then handle the rest in order.
Should you hire someone or do this yourself?
Any reasonably tech-savvy owner can do items 1-5 and 11-13. The free tools above make it possible. Items 6-8 cover Core Web Vitals work beyond simple image fixes. Items 14-15 cover redirect chain cleanup on large sites. Both often need a developer. Here is the plan. Do what you can yourself right away. Brief a developer on the items that need code changes. Use the cost context in how much SEO costs for a small business to budget that work accurately.
Keep reading
Each item here has its own deep-dive article. For performance, see Core Web Vitals and page speed SEO. For crawling, see how Google crawls and indexes your website. For architecture, see site architecture and URL structure. For the full strategy, see what is technical SEO.
Sources
- Google Search Central - Search Console documentation, Core Web Vitals thresholds, and structured data guidelines. developers.google.com/search
- Screaming Frog - SEO Spider tool documentation and audit methodology. screamingfrog.co.uk
- Ahrefs - technical SEO audit framework and ranking factor research. ahrefs.com/blog
Want a prioritised audit of your site? Get a free Brand and Tech Assessment. It ranks the fixes that can move your rankings fastest and arrives within 48 hours.
Book a free Brand and Tech Assessment. See exactly how Through The Glass Creatives would grow your organic visibility.
The Through The Glass Creatives Difference
Brands choose Through The Glass Creatives for work like this for a reason. Its creative direction is behind OWWA, Nuvia, and over 100 brands. Its growth and brand strategy back every build. TTGC builds a managed system that compounds. It is not a one-off project or a ticket queue. The TTGC team is built for outcomes that matter. Book your free Brand and Growth Assessment.
