In 2026, SEO isn't just about Google. It's about being discoverable in search engines and cited by AI assistants. This checklist covers what your website needs to perform in both.
Technical Foundations
- HTTPS everywhere – All pages must load over HTTPS. Certificate errors or mixed content hurt trust and rankings.
- Mobile-first – Google indexes the mobile version first. Your site must be responsive and fast on small screens.
- Core Web Vitals – LCP under 2.5s, FID under 100ms, CLS under 0.1. Tools like PageSpeed Insights and Search Console report these.
- XML sitemap – Submit a sitemap to Google Search Console. Include all important pages; exclude thin or duplicate content.
- robots.txt – Allow crawling of public content. Block only what you truly want hidden (e.g., admin or staging paths).
On-Page SEO
- Unique title tags – Each page needs a distinct, descriptive title (50–60 characters). Include your primary keyword.
- Meta descriptions – Compelling summaries (150–160 characters) that encourage clicks. They don’t directly affect rank but influence CTR.
- Heading hierarchy – Use H1 once per page for the main topic. H2/H3 for sections. Don’t skip levels.
- Internal linking – Link from high-authority pages to important but lower-traffic pages. Help both users and crawlers discover content.
- Image optimization – Descriptive file names, alt text for every image, and formats like WebP where supported.
Content and Structure
- Structured data – Schema.org markup for articles, products, FAQs, and organizations. Helps search engines and AI tools understand your content.
- Clean URLs – Short, readable paths (e.g.,
/blog/seo-checklist-2026). Avoid long query strings or random IDs. - Canonical tags – Specify the canonical URL for pages that might have duplicate variants (e.g., with tracking parameters).
AI and Answer Engines
- llms.txt – A machine-readable file that describes your site and key content for AI crawlers. Similar in spirit to robots.txt but for large language models.
- Clear, factual content – AI assistants cite sources that are well-structured and authoritative. Write clearly and cite your own sources.
- FAQ and how-to content – Formats that answer questions directly tend to get surfaced in both search and AI responses.
Ongoing Maintenance
- Monitor Search Console – Check indexing status, crawl errors, and performance metrics monthly.
- Update content – Refresh key pages when information changes. Stale content loses relevance.
- Fix broken links – Internal and external 404s harm user experience and can signal neglect to crawlers.
Use this checklist when building or auditing your site. SEO in 2026 is about being technically sound, human-readable, and AI-friendly.