1. What an SEO audit is (and isn't)

An SEO audit reviews the factors that affect whether your pages can be found, crawled, indexed and ranked by search engines. It's diagnostic, not cosmetic — the point is to surface concrete problems and turn them into a prioritized to-do list. A good audit answers three questions: Can Google access my pages? Do my pages clearly signal what they're about? Is anything actively hurting the experience?

An audit is not a one-time event. Sites change, links break, pages slow down, and Google's expectations shift. Running a quick audit regularly — and always after a redesign or migration — catches problems before they cost you traffic.

2. Indexing & crawlability

This is the foundation: a page that isn't indexed can't rank, no matter how good it is. Start here.

  • Is the page indexed? Check status in Google Search Console's URL Inspection tool, or check many URLs at once with a bulk index checker.
  • Does robots.txt accidentally block important pages? One stray Disallow can hide a whole section from Google.
  • Do you have a valid XML sitemap, and is it submitted? The sitemap is how you hand Google a map of your URLs.
  • Are there stray noindex tags? A noindex left over from staging will quietly keep a page out of search.
Common trap Make sure your sitemap file actually returns valid XML when opened — a server rewrite that serves your homepage instead of the sitemap will make Google report "couldn't fetch," even though the link looks fine.

3. On-page SEO

On-page factors tell Google (and readers) what each page is about. For your important pages, check that each has:

  • One clear, unique title tag with the target keyword near the front.
  • A unique meta description that earns the click (see our meta description guide).
  • A single H1 that matches the page's topic, with a logical H2/H3 structure beneath it.
  • Descriptive, keyword-aware URLs — short and readable beats long and random.
  • Image alt text that describes the image for accessibility and image search.
  • Internal links connecting the page to related content.

Thin content is the quiet killer here. If a page is mostly a widget or a few lines of text, it gives Google little reason to rank it. Adding genuinely useful copy — what the page does, how to use it, the underlying concept — is often the highest-leverage on-page fix you can make.

4. Technical health

Technical issues silently erode rankings. The high-value checks:

  • HTTPS everywhere. Secure pages are expected; mixed content (HTTP assets on an HTTPS page) breaks the padlock.
  • Canonical tags. Tell Google which version of a page is the original to avoid duplicate-content confusion.
  • Broken links and redirect chains. Dead links waste crawl budget and frustrate users; long redirect chains slow everything down. A broken link checker and redirect checker surface these fast.
  • Structured data. Schema markup can earn rich results (FAQs, reviews, breadcrumbs) that stand out in search.

5. Speed & Core Web Vitals

Page speed affects both rankings and conversions. Google measures real-world experience through Core Web Vitals — a small set of metrics covering loading (Largest Contentful Paint), interactivity (Interaction to Next Paint), and visual stability (Cumulative Layout Shift). You don't need perfect scores, but pages that are slow or that jump around as they load lose visitors.

Quick wins that move the needle most: compress and properly size images, defer non-critical scripts, and avoid layout shifts by reserving space for images and embeds. Test specific pages with Google's PageSpeed Insights and fix the biggest offenders first.

6. Security & mobile

Two baseline expectations that an audit should confirm:

  • Mobile-friendliness. Google indexes the mobile version of your site first. If your pages are hard to use on a phone — tiny text, tap targets too close, content wider than the screen — that's a ranking and usability problem.
  • Security basics. A valid SSL certificate, no malware or insecure resources, and sensible security headers. A site flagged as insecure loses trust instantly.

7. How to prioritize the fixes

An audit will hand you a long list, and trying to fix everything at once is how audits end up ignored. Sort the findings by impact and effort:

  • Fix blockers first. Anything stopping pages from being indexed or crawled — a bad robots.txt, accidental noindex, broken sitemap — comes before everything else. These are usually quick and high-impact.
  • Then quick, high-impact wins. Missing titles and descriptions, broken links, thin content on important pages.
  • Then the bigger projects. Site speed overhauls, structural changes, and large content rewrites — valuable but slower.

Running through all of this by hand takes time and it's easy to miss things. An automated audit checks dozens of these factors in one pass and scores them, so you get the prioritized list without the manual digging.

Run a full audit with the SEO Audit Tool

Get an instant 0–100 score across 37 on-page, technical, performance and security checks — with a clear fix for everything that needs attention. Free, no signup.

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An audit tells you what to fix; the rest of this blog covers how. Start with keyword research for the content side, or the rankings guide to track whether your fixes are working.