How to Do an SEO Audit

What is an SEO audit?

An SEO audit is a structured review of your website that finds the technical, on-page, content and off-page issues holding back your search visibility, then turns them into a prioritized list of fixes. The goal is simple: see exactly why you are not ranking (or being cited by AI) and know what to change first.

A good audit checks how search engines crawl and index your site, whether your pages answer the right queries, how fast and stable the site is, and how trusted it looks to Google. In 2026 it also checks one more thing that most older guides skip: whether AI search engines like ChatGPT, Perplexity, Gemini and Google AI Overviews can read and cite your content.

You can run an SEO audit yourself with free tools, use a paid platform, or have it done for you. This page is the hub for our whole audit system: start here, then go deep with the step-by-step walkthrough below, the full checklist, and the tools comparison below.

Why an SEO audit matters

Search visibility decays on its own. Pages that ranked last year slip as competitors publish, Google updates its algorithm, and your own content goes stale. An audit catches that decay early and protects the organic traffic you already earned.

It also catches expensive, invisible problems: pages accidentally set to noindex, broken redirects bleeding link equity, slow Core Web Vitals dragging down rankings, or a manual action (Google penalty) you never noticed. A single fixed crawl error can recover traffic that paid ads would cost thousands to replace.

More than that, your onsite SEO is the base that decides how well you can ever do in your niche. It sets the ceiling on your results. Trying to rank a site with weak onsite SEO is like racing in Formula 1 with a Toyota Prius: you will move, just not well, and never fast enough to beat the people who got the fundamentals right.

This still holds in the age of AI search. You will not have much luck getting cited by ChatGPT, Perplexity or Google AI Overviews if your fundamentals are broken, because these AI search engines are built on top of traditional search. They lean on the same crawling, indexing and trust signals. Fix the base first, and everything you layer on top of it works better.

When and how often to run one

• Quarterly: a light health check keeps small issues from compounding.
• After a site migration or redesign: these are the most common cause of sudden traffic loss.
• After a traffic drop or algorithm update: audit to find what changed.
• Before a big content push: fix the foundation before you build on it.

The 4 types of SEO audit

Most SEO audits cover four areas. You can audit all of them together or focus on one at a time.

The deepest of these is the technical layer, which is why it gets its own technical SEO audit guide. The content side has its own content audit guide covering pruning, decay and AI citations.

Before you start: tools and access you need

You can run a complete audit with free tools. Set these up before you begin:

• Google Search Console: verify your site to see indexing, queries and Core Web Vitals.
• Google Analytics 4: connect it for traffic and conversion data.
• A crawler: Screaming Frog (free up to 500 URLs) to scan the whole site.
• PageSpeed Insights / Lighthouse: for performance, no setup needed.

How to do an SEO audit, step by step

To do an SEO audit, work eight steps in order: crawl the site, check indexing, audit on-page elements, review Core Web Vitals, assess content quality, map internal linking, evaluate backlinks, then check AI search readiness. Fix what you find in priority order.

The order matters. Each step assumes the one before it is clean, and there is no point rewriting a title tag on a page Google cannot index.

Step 1: Crawl your site

Run Screaming Frog (or your audit tool) across your whole site to surface broken links, redirect chains, duplicate titles, missing metadata and error pages. This crawl is your map of everything that needs attention, and it mirrors how Googlebot sees your site.

Step 2: Check indexing, robots.txt and sitemap

Open the Pages report in Google Search Console to see which URLs are indexed and which are excluded, and why. Confirm robots.txt does not block important sections, your XML sitemap is submitted and current, and no key page carries an accidental noindex tag. Indexing problems make every other fix pointless, so resolve them first.

Step 3: Audit on-page elements

Check that every important page has a unique, descriptive title tag with its target keyword, a compelling meta description, one clear H1, and a logical H2/H3 heading structure. Confirm the content actually matches the search intent behind the query you want to rank for. Your crawl export makes spotting missing or duplicate titles and meta descriptions fast.

Step 4: Review Core Web Vitals and mobile

Run your key page templates through PageSpeed Insights and check the three Core Web Vitals: LCP (loading), INP (responsiveness) and CLS (visual stability). Use the Core Web Vitals report in Search Console for real-user field data, and confirm the site passes mobile-first indexing, since Google indexes the mobile version of your pages.

Step 5: Audit content quality, intent and cannibalization

Review your content for decay and overlap. Identify underperforming "zombie" pages with no traffic, thin pages that should be merged, and keyword cannibalization where two pages compete for the same query. Find content gaps (topics your audience searches that you have not covered) and topic clusters that need a stronger pillar page. This is a full content audit in miniature.

Step 6: Analyze internal linking and site architecture

Map how pages connect. Important pages should sit within a few clicks of the homepage, every page should have internal links pointing to it (no orphans), and anchor text should describe the destination. Strong internal linking spreads authority and signals your topic clusters to both Google and AI crawlers.

Step 7: Evaluate backlinks and authority

Review your backlink profile and referring domains for quality and relevance, compare your Domain Rating or Domain Authority against competitors, and flag any toxic links (disavow only if you see real spam or a manual action). For YMYL topics especially, check that your E-E-A-T signals (author bios, citations, credentials) are clear.

Step 8: Audit for AI search and LLM visibility

Finally, the step competitors skip: audit whether AI search engines can find and cite you. Confirm AI crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended) are allowed in robots.txt, that each page answers its core question in the first sentence or two, that structure and schema make content easy to extract, and that your topic is covered completely enough to win AI fan-out queries. This is generative engine optimization, covered fully in our AI SEO guide.

Work the full 50-point SEO audit checklist alongside these steps: the steps are the method, the checklist is the list of every individual thing to verify. It is free to download as a spreadsheet.

Turn your findings into an action plan

An audit is only useful if it ends in shipped fixes. Score every finding by impact versus effort and apply the 80/20 rule: a small number of changes (fixing indexation, recovering a decayed top page, improving a slow key template) usually drive most of the gain. Do those first.

Build the report and template

Capture findings in a simple SEO audit report: the issue, where it occurs, its priority, and the fix. A shared Google Sheet or a free SEO audit report PDF works fine; you do not need a 200-page document. Members get a ready-made SEO audit report template and checklist to drop their findings into. Then assign owners and due dates, and re-check after fixes land.

Auditing your site for AI search and GEO

An AI search audit checks whether answer engines like ChatGPT, Perplexity, Gemini and Google AI Overviews can crawl your site, read your content, and cite you in their answers. This is the layer almost every classic audit ignores, and it is increasingly where buyers actually find you.

The mechanics overlap with classic SEO but add new checks. AI crawlers such as GPTBot, ClaudeBot, PerplexityBot and Google-Extended need to be allowed in robots.txt. Your most important answers should sit in the first sentence or two of a page so a model can lift them cleanly. Clean headings, lists and tables make content easy to extract, and schema plus real author signals raise trust.

This is the generative engine optimization (GEO) layer, and it is our specialty. Learn the full discipline in our AI SEO guide, and use your keyword research to map the questions AI search actually fans out into. An audit that ignores AI search is auditing yesterday's web.

New in your audit: agentic browsing

Google Lighthouse has added a new category that matters for this exact shift: agentic browsing. It measures how well an AI agent (the kind that browses the web on a person's behalf) can actually reach, read and act on your site. As agents do more of the clicking and buying, how agent-friendly your pages are becomes a real visibility factor, sitting right alongside the classic checks.

You can test it for free. Install Chrome Canary (an early-release build of Chrome), open DevTools, go to the Lighthouse tab, tick Agentic Browsing, and click Analyse page load. Alongside the usual Performance, Accessibility, Best Practices and SEO scores, you now get an agentic browsing result:

SEO audit tools (free and paid)

You can run a credible SEO audit for free. Google Search Console, Google Analytics and PageSpeed Insights cover indexing, traffic and performance at no cost, and Screaming Frog crawls up to 500 URLs free. Paid suites like Semrush Site Audit and Ahrefs Site Audit add automated scoring, scheduled crawls and prioritized issue lists.

One thing those tools will not tell you is where you actually rank today. Search Console reports an average position blended across every query, device and location, which routinely hides a page sitting at 15 for the one keyword you care about. Our free Google rank checker returns the live position for a single domain and keyword, along with the ten results above you. Run it on your three most important keywords before you start fixing anything: the pages stuck on page two are almost always the cheapest wins in the whole audit.

Start free: check your site speed with GTmetrix

If you are not sure where to begin, run your homepage through GTmetrix, a free tool that grades your site speed and Core Web Vitals and shows what is slowing each page down. It returns a report like this:

The catch is interpretation. Depending on your technical background, these reports can be hard to read: it is not always obvious what a metric means or what to actually do about it. Here is the shortcut we use. In our experience, around 70% of the time a site loads slowly because of heavy, uncompressed images, and GTmetrix points to the exact files dragging your page down. The fix is usually simple: compress those images and serve them as WebP. See our guides on optimizing images for SEO and using WebP.

If the report still feels too technical, the language really is jargon-heavy, you can hand it to this free GTmetrix Report Analyser custom GPT. Paste in your results (or a screenshot of the report) and it explains, in plain English, what each metric means and exactly what to fix first.

Inside the community, members use DataWise, our SEO tool that runs automated audits and returns a prioritized fix list covering both classic SEO and AI-search readiness in one pass. It is free for members. For the full breakdown of free versus paid options, see the SEO audit tools guide.

Using AI in your audit workflow

Yes, ChatGPT and other AI can help run an audit: cluster pages by topic, draft rewritten titles and meta descriptions, summarize crawl exports, and flag thin content for review. AI does not replace judgment, but it removes the grunt work. Members do this with DataWise, our SEO tool that runs the automated audit (classic plus AI-search) and returns a prioritized fix list. It is free for members.