How to Do a Technical SEO Audit

To do a technical SEO audit, crawl your entire site with an SEO crawler, then systematically check indexation, crawlability, site speed and Core Web Vitals, mobile-friendliness, site structure, and structured data — logging every issue. Then prioritize the findings by impact, fixing crawl and indexing blockers first (they prevent everything else from working). A technical audit isn’t a flat checklist; it’s a diagnostic process that ends in a prioritized fix list. Here’s the step-by-step.

This guide covers auditing the technical health of a site and turning findings into a prioritized fix list.

What a technical SEO audit is

A technical SEO audit is a systematic diagnostic of the technical factors affecting how search engines crawl, render, and index your site. It’s the auditing counterpart to doing technical SEO — you’re finding what’s wrong so you can fix it. The output isn’t just a list of checks; it’s a prioritized set of issues ranked by their impact on rankings. Fix the crawl/index blockers first, then work down.

Step 1 — Crawl the entire site

Start by crawling your site with an SEO crawler (Screaming Frog, Sitebulb, or a platform’s site audit). A crawl surfaces:

• All URLs, status codes (404s, redirects), and redirect chains.
• Titles, metas, headings, canonicals, and directives.
• Broken links, orphan pages, and structural issues.

The crawl is your raw diagnostic data — everything else interprets it.

Step 2 — Check indexation and crawlability (highest priority)

The most important checks, because they gate everything:

• robots.txt — is it accidentally blocking important pages?
• Indexing — compare pages that should be indexed vs. what’s in Search Console’s Pages report; investigate “excluded” pages.
• Noindex tags — any accidental noindex on pages you want indexed?
• Canonicals — pointing correctly? Any conflicts?

Crawl/index problems prevent ranking entirely, so they’re audit priority #1.

Step 3 — Audit site speed and Core Web Vitals

Check performance:

• Core Web Vitals via the Search Console report and PageSpeed Insights.
• Page speed issues — heavy images, render-blocking resources, no caching.
• Test on mobile, not just desktop.

Log the specific speed issues and which pages/templates they affect.

Step 4 — Check mobile-friendliness

Since Google uses mobile-first indexing:

• Mobile usability issues (Search Console + testing).
• Content parity — does the mobile version have the same content as desktop?
• Responsive behavior across screen sizes.

Step 5 — Audit site structure and internal linking

• Site structure — shallow enough? Important pages reachable?
• Internal linking — orphan pages, weak internal links to key pages.
• URL structure — clean, consistent, no parameter chaos.

Step 6 — Validate structured data and other technical elements

• Structured data — present, valid (Rich Results Test), no errors; LocalBusiness homepage-only, no AggregateRating.
• HTTPS — fully secure, no mixed content, http→https redirects.
• XML sitemap — accurate, submitted, no errors.
• Duplicate content issues.

Step 7 — Prioritize findings and build a fix list

The step that makes the audit useful: turn findings into a prioritized action list.

• Severity first — crawl/index blockers (highest), then speed/mobile, then structure/schema refinements.
• Impact × effort — quick high-impact wins before slow marginal ones.
• A technical audit that ends in a prioritized, actionable fix list (not a raw 200-item dump) is the one that actually improves the site.

The bottom line

Do a technical SEO audit by crawling the whole site, then systematically checking indexation and crawlability (first), speed and Core Web Vitals, mobile-friendliness, structure and internal linking, and structured data — then prioritizing every finding by impact into an actionable fix list. It’s a diagnostic process, not a flat checklist, and crawl/index blockers always come first. (SEO consulting runs technical audits and fixes — or run a run a free audit.)

Frequently asked questions

How do I do a technical SEO audit? Crawl your entire site with an SEO crawler to gather status codes, metadata, and structural data, then systematically check indexation and crawlability first (robots.txt, indexing, noindex, canonicals), followed by site speed and Core Web Vitals, mobile-friendliness, site structure and internal linking, and structured data. Log every issue, then prioritize the findings by impact — fixing crawl and indexing blockers first — into an actionable fix list. It’s a diagnostic process ending in prioritized fixes, not just a checklist.

What is a technical SEO audit? A technical SEO audit is a systematic diagnostic of the technical factors affecting how search engines crawl, render, and index your site — including crawlability, indexation, site speed, mobile-friendliness, structure, security, and structured data. It’s the auditing counterpart to doing technical SEO: you find what’s wrong so you can fix it. A good audit produces not just a list of checks but a prioritized set of issues ranked by their impact on rankings, ending in an actionable fix list.

What tools do I need for a technical SEO audit? The core tool is an SEO crawler like Screaming Frog or Sitebulb (or a platform’s site audit feature) to crawl the site and surface issues. Google Search Console is essential for indexation data, Core Web Vitals, and mobile usability, and PageSpeed Insights for speed and performance. The Rich Results Test validates structured data. Together these free and paid tools cover crawling, indexing, performance, mobile, and schema — the full technical audit.

What should I check first in a technical audit? Check crawlability and indexation first, because they gate everything else — if search engines can’t crawl or index your pages, no other optimization matters. Verify robots.txt isn’t blocking important pages, check the indexing status of pages that should be indexed, look for accidental noindex tags, and confirm canonicals point correctly. Only after ensuring pages can be crawled and indexed should you move on to speed, mobile, structure, and schema issues.

How often should I do a technical SEO audit? Do a thorough technical SEO audit periodically — for example, quarterly or a few times a year for an active site, and always after major changes like a redesign, migration, or platform switch. Between full audits, monitor Search Console continuously for crawl errors, indexing issues, and Core Web Vitals so you catch problems as they arise. The right cadence depends on site size and how often it changes, but ongoing monitoring plus periodic deep audits is the general approach.

What is the difference between a technical SEO audit and a full SEO audit? A technical SEO audit focuses specifically on the technical foundations — crawlability, indexation, speed, mobile, structure, security, and schema — that let search engines access and process your site. A full SEO audit is broader, also covering content quality, keyword targeting, on-page optimization, backlinks, and competitive positioning. The technical audit is one component of a full audit. You might do a focused technical audit to diagnose technical health, or a full audit for a complete picture of your SEO.

How do I prioritize technical SEO issues? Prioritize by severity and impact: crawl and indexing blockers come first because they prevent pages from ranking at all, followed by significant issues like poor Core Web Vitals or mobile problems affecting many pages, then structural and schema refinements. Within that, weigh impact against effort to tackle quick, high-impact wins before slow, marginal ones. The goal is an actionable, prioritized fix list rather than an overwhelming undifferentiated dump of every issue found.

Written by Bryan Collins, SEO & AEO strategist. Want a technical audit and prioritized fixes? See done-for-you SEO or run a free local visibility audit.