Technical SEO Checklist for 2025

Speed, crawlability, and indexation form the base of any SEO program. This checklist covers what we audit and fix for clients in 2025.

Core Web Vitals

• LCP (Largest Contentful Paint) — Aim for under 2.5s. Optimize images, fonts, and critical CSS.
• INP / FID (Interaction to Next Paint) — Keep main thread light; defer or break up heavy JS.
• CLS (Cumulative Layout Shift) — Reserve space for images and ads; avoid layout jumps.

Use real user data (e.g. CrUX) and lab tools (Lighthouse) together.

Crawlability and indexing

• Robots.txt — Allow what should be crawled; disallow admin, parameters, or low-value sections.
• Sitemaps — XML sitemap(s) for important URLs; keep them updated and under size limits.
• Canonicals — One canonical URL per logical page; fix duplicate content and parameter URLs.
• Status codes — 404 for gone pages, 301 for permanent moves, 410 if you want deindexing.

Mobile and structure

• Mobile-first — Design and test for mobile; ensure content and links match desktop.
• Structured data — Implement schema (Article, FAQ, LocalBusiness, etc.) where it fits; validate with Google’s tool.
• HTTPS — Site-wide; no mixed content.

Quick wins

1. Fix redirect chains and loops.
2. Ensure important pages are in the sitemap and not noindexed by mistake.
3. Improve server response time and resource loading (hosting, CDN, caching).
4. Use semantic HTML (headings, landmarks) so crawlers understand structure.

Technical SEO isn’t glamorous, but it’s what lets your content actually get crawled, indexed, and ranked. Run this checklist at least quarterly.