The 2026 Technical SEO Checklist

Crawlability and Indexation

Start with the basics, because they still break more sites than anything exotic. Check your robots.txt — it should allow Googlebot full access to your content, CSS, and JavaScript while blocking only genuinely private areas like admin pages and internal search results. Then verify in Google Search Console’s Pages report that your important pages are actually indexed, and investigate anything important sitting in “Discovered — currently not indexed” or “Crawled — currently not indexed.”

Audit for the classic indexation killers: noindex tags left over from staging sites (this is shockingly common — we’ve seen it on live business sites), canonical tags pointing at the wrong URLs, and redirect chains that waste crawl budget. Every important page should be reachable within three clicks from the homepage, and your XML sitemap should list only canonical, indexable URLs — no redirects, no 404s, no noindexed pages. A clean sitemap is a direct line to Google about what you consider worth indexing.

Site Speed and Core Web Vitals

Page experience remains a ranking factor, and with AI Overviews skimming clicks from informational queries, the clicks you do earn need to convert — slow pages kill that. Measure with PageSpeed Insights and focus on the three Core Web Vitals: Largest Contentful Paint (under 2.5 seconds), Interaction to Next Paint (under 200 milliseconds), and Cumulative Layout Shift (under 0.1). Test on real mobile devices or throttled connections, not just your office fiber — your users aren’t all on fiber.

The usual fixes still work: compress and properly size images (WebP or AVIF, responsive srcsets), defer non-critical JavaScript, eliminate render-blocking resources, and use a good cache. On WordPress specifically, the biggest wins usually come from cutting plugin bloat — every plugin adds weight, so audit ruthlessly — and using server-level caching. If your theme loads five font weights and three slider libraries on every page, no amount of caching saves you. Fix the theme or replace it.

Mobile and Rendering

Google has been mobile-first for years, and in 2026 there’s no excuse for a site that doesn’t work flawlessly on a phone. But “mobile-friendly” now means more than responsive layout — it means Google can render your pages the way users see them. If critical content or links depend on JavaScript that Googlebot struggles with, that content effectively doesn’t exist for ranking purposes.

Check the rendered HTML in Search Console’s URL Inspection tool against what users see. They should match in all meaningful respects. Avoid interstitials and popups that cover content on mobile — they’re a direct user-experience penalty and they interfere with rendering. And make sure tap targets are sensibly sized, text is readable without zooming, and nothing requires hover on touch devices. These are basics, but basics are where sites fail.

Structured Data and Entities

Schema markup has graduated from “nice to have” to essential infrastructure. At minimum, your site should carry Organization schema (with your correct business name, logo, and social profiles), WebSite schema, and Article or BlogPosting schema on content with author information and publish dates. Local businesses need LocalBusiness schema with accurate name, address, phone, and hours. E-commerce needs Product schema with pricing and availability.

Validate everything with Google’s Rich Results Test and keep it maintained — schema that contradicts your visible content or goes stale does more harm than good. Beyond formal schema, write your content with entities in mind: clearly and consistently name your business, your authors, your locations, and your key topics in natural language. AI search resolves entities, not keyword strings, and structured data plus consistent prose is how you make your entities unambiguous.

Site Architecture and Internal Linking

Good architecture distributes authority and helps both crawlers and users find things. Organize content into clear topical clusters: pillar pages covering broad topics, linked to and from detailed sub-pages. Your most important pages should have the most internal links pointing at them — use descriptive, varied anchor text, not “click here.” Breadcrumb navigation helps users and gives Google clean hierarchical signals; mark it up with BreadcrumbList schema.

Run a crawl (Screaming Frog’s free tier handles small sites) and look for orphans — pages with no internal links pointing to them. Orphaned pages are nearly invisible to Google regardless of quality. Also watch for deep pages (more than 4-5 clicks from home) that deserve better placement, and for internal links pointing at redirects or 404s, which waste crawl budget and look neglected.

Security, HTTPS, and Trust Signals

HTTPS is table stakes — every page, every resource, no mixed content. Check that http:// versions redirect cleanly to https:// in a single hop, and that www versus non-www resolves consistently to one canonical version. Beyond encryption, keep everything updated: WordPress core, themes, and plugins. Outdated software is the number one way small sites get compromised, and a hacked site can lose years of rankings overnight.

Trust signals extend to the visible layer too: a real About page, clear contact information, privacy policy and terms pages, and author bylines with credentials. These feed directly into E-E-A-T evaluation — both Google’s quality systems and the AI models deciding what to cite look for signs that a real, accountable entity stands behind the content.

AI-Era Additions

A few items that didn’t exist on checklists five years ago. First, make sure your content is accessible to AI crawlers where you want visibility — check that you’re not accidentally blocking GPTBot, ClaudeBot, or Perplexity’s crawlers in robots.txt if AI citation matters to your strategy (it’s a business decision; there’s a real debate about training-data use, so decide deliberately rather than by accident). Second, keep your llms.txt file in mind — an emerging convention for guiding AI systems to your key content, worth implementing as standards settle.

Third, monitor how you appear in AI-generated answers, not just classic rankings. Track brand mentions in AI Overviews for your key queries with periodic manual checks. And fourth, double down on originality signals: original images with descriptive alt text and filenames, original data, unique insights. In an era where AI can generate infinite generic content, provable originality is a differentiator that technical SEO can amplify but never replace.

Run It Quarterly

Technical SEO isn’t a one-time project — sites drift. Plugins update, content grows, redirects accumulate, things break silently. Put this checklist on a quarterly schedule: crawl the site, check Search Console coverage, re-test Core Web Vitals, validate schema, review the AI-crawler situation. An hour or two every three months catches problems while they’re small. The sites that rank consistently aren’t the ones with the cleverest tricks — they’re the ones whose foundations never crack.