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SEO Audit Checklist 2026: 47 Items Every Website Should Pass

The definitive 2026 SEO audit checklist: 47 technical, content, performance and AI-search items every website must pass to rank. Free template included.

SEO Audit Checklist 2026: 47 Items Every Website Should Pass
·12 min read·SEOrganiq Team

An SEO audit is not a vibes check. It is a 47-item gate every URL on your site must pass. Below is the same checklist SEOrganiq runs on every paid audit — use it free.

1. Technical (12 items)

  1. robots.txt present, allows crawl, references sitemap
  2. sitemap.xml present, < 50 MB, < 50,000 URLs per file
  3. All canonical tags self-reference or point to a 200 URL
  4. No noindex on indexable pages
  5. HTTPS enforced site-wide, no mixed content
  6. HTTP/2 or HTTP/3 enabled
  7. Server response time under 600 ms (TTFB)
  8. hreflang correct for every localized URL pair
  9. No infinite crawl traps (faceted nav, calendar pages)
  10. 404s return real 404 (not soft-200s)
  11. <html lang> matches content language
  12. No more than one H1 per page

2. On-page (10 items)

  1. <title> between 30–60 characters, unique per URL
  2. Meta description 70–160 characters, unique
  3. H1 contains primary keyword
  4. URL contains primary keyword, lowercase, hyphenated
  5. Image alt text on every meaningful image
  6. Internal links use descriptive anchor (not "click here")
  7. Outbound links: editorial rel= set correctly
  8. Schema markup present (Organization, WebSite, BreadcrumbList minimum)
  9. FAQ schema on FAQ blocks
  10. Article schema on blog posts

3. Core Web Vitals & performance (8 items)

  1. LCP under 2.5 s on mobile
  2. CLS under 0.1
  3. INP under 200 ms
  4. Images served as WebP/AVIF with explicit width and height
  5. Above-the-fold images use fetchpriority="high"
  6. Below-the-fold images use loading="lazy"
  7. CSS critical path under 14 KB compressed
  8. JS bundle under 200 KB compressed

4. Content quality (8 items)

  1. Each cluster has a pillar page targeting head keyword
  2. Cluster pages target long-tail variants
  3. Internal links flow from pillar ↔ cluster
  4. Articles updated in last 12 months
  5. Original images or licensed stock (no AI watermarks)
  6. Tables, lists and headings break up text every 200–300 words
  7. Author bio visible with E-E-A-T signals
  8. Schema datePublished and dateModified accurate

5. AI search / LLM visibility (4 items)

  1. Content cited by Perplexity, ChatGPT and Gemini in your top 10 queries
  2. Brand entity exists in Wikidata / Wikipedia
  3. Organization JSON-LD with sameAs pointing to social profiles
  4. FAQ pages structured so LLMs can extract Q&A pairs

6. Off-page (5 items)

  1. Referring domains growing month-over-month
  2. No more than 30% anchor text from exact match
  3. No links from spam neighborhoods (DR < 5, no traffic)
  4. Brand mentions monitored (unlinked → outreach for link)
  5. Google Business Profile complete (for local) with weekly posts

How to use this checklist

Run it quarterly. The first audit will surface 10–20 failures; that is normal. Fix in this order: technical → on-page → performance → content → AI → off-page.

Or skip the spreadsheet and run a free SEOrganiq Audit — it scores every item automatically and gives you a prioritized fix list.