Article

Technical SEO Checklist for Websites

GAP Team · Jul 16, 2026 · 9 min read

A pragmatic technical SEO checklist you can actually finish. Work through it top to bottom the first time, then use it as a monthly health check.

1. Crawlability

  • robots.txt allows all indexable sections.
  • XML sitemap includes every canonical URL and is referenced in robots.txt.
  • No orphan pages — every important URL has at least one internal link.
  • Clean, lowercase, hyphenated URLs with no session parameters.

2. Indexing

  • Canonical tags self-reference on the primary URL.
  • No accidental noindex on money pages.
  • Search Console coverage report shows < 5% of URLs excluded.
  • Duplicate content resolved with canonical or 301.

3. Performance & Core Web Vitals

LCP under 2.5s, INP under 200ms, CLS under 0.1 for 75% of real users. Deep dive: What Are Core Web Vitals? and How to Improve Website Speed.

4. Mobile & rendering

  • Viewport meta tag present. Tap targets ≥ 48px.
  • Content is server-rendered or pre-rendered — not injected after JS hydration.
  • Fonts and images use responsive loading with loading="lazy" below the fold.

5. Structured data

JSON-LD for Organization sitewide, plus Article, Product, or FAQ on the appropriate templates. Validate with the Rich Results Test.

6. Monitor continuously

A checklist is a snapshot. Regressions happen on every deploy — run a continuous scan so you catch a broken canonical the day it ships, not the quarter Google notices.

Frequently asked questions