6 SEO Audit Checks That Actually Find Problems (2026 Guide)

Most SEO audits come back as a 40-page PDF full of things that don’t move the needle. The checks below are the ones I run first on any site, because they catch the problems that actually cost you traffic. If you fix nothing else this quarter, fix these.

1. Can Google Actually Crawl and Render the Site?

Before you touch titles or keywords, confirm the basics aren’t broken. This is where I find the dumbest, most expensive problems: a stray Disallow: / in robots.txt, a staging site that leaked into the index, or a JavaScript-heavy homepage that renders blank to Googlebot.

Start with robots.txt. Fetch it live, don’t read the file on your server, because a CDN or WAF can serve something different to bots:

curl -A "Googlebot" https://example.com/robots.txt

# Check for a global block
User-agent: *
Disallow: /

Then check the rendered HTML, not just the source. Google renders pages with a modern Chrome version, but anything behind a click, a scroll, or a tab might never get rendered. If your content only appears after user interaction, assume Google won’t see it.

Quick way to see what Googlebot gets:

curl -A "Googlebot" -L https://example.com/ | grep -i "<title>"

# If your title, H1, or main copy is missing here
# and only appears after JS runs, you have a rendering problem.

Also confirm your XML sitemap is clean. It should contain only canonical, indexable URLs returning 200. Old tag pages, paginated archives, and redirects don’t belong in there.

2. Indexation: What’s Actually in Google’s Index vs. What Should Be

The single most underrated audit step is comparing your sitemap against what’s actually indexed. Search Console’s Pages report tells you why URLs are excluded, and most of the time people never read it.

Run this comparison manually or with a crawler:

• Pull every URL from your sitemap.
• Check each one with a site: query or the URL Inspection tool.
• Flag anything “Discovered – currently not indexed” or “Crawled – currently not indexed.”
• Flag anything indexed that shouldn’t be (staging, parameter URLs, old campaign pages).

“Crawled – currently not indexed” almost always means one of two things: thin content, or the page is competing with a stronger page on your own site. That second one is a cannibalization problem, covered below.

Don’t forget to check for accidental noindex tags on pages you care about. It happens more than you’d think after a site migration or a CMS update.

3. Core Web Vitals in 2026: INP Replaced FID

If your audit checklist still says “FID,” it’s stale. First Input Delay was retired in March 2024 and replaced by Interaction to Next Paint (INP). INP measures the latency of every interaction on the page, not just the first one, and it’s much harder to game.

The three metrics that matter now:

• LCP (Largest Contentful Paint): under 2.5 seconds.
• INP (Interaction to Next Paint): under 200 milliseconds.
• CLS (Cumulative Layout Shift): under 0.1.

Pull field data from the Chrome UX Report via PageSpeed Insights, not just the lab score. Lab scores are a snapshot; field data is what real users on real connections experience. For a lot of local businesses, the biggest wins are image compression, lazy loading below-the-fold media, and trimming third-party scripts (chat widgets, tag managers, and tracking pixels are the usual INP killers).

If you want to test a specific interaction, use the Performance panel in DevTools and look for long tasks blocking the main thread:

// Log any interaction that takes too long to paint
new PerformanceObserver((list) => {
 for (const entry of list.getEntries()) {
 if (entry.duration > 200) {
 console.warn('Slow interaction:', entry.name, entry.duration + 'ms');
 }
 }
}).observe({ type: 'event', buffered: true, durationThreshold: 200 });

4. Structured Data: Valid, Relevant, and Actually Matching the Page

Schema markup won’t rank you by itself, but it changes how you show up in results, and broken schema can cost you rich results you already earned. In 2026, the schema types that matter for most sites are LocalBusiness, Organization, Product, Article, BreadcrumbList, and FAQPage where genuinely applicable.

Two failure modes I see constantly:

• Schema that describes something the page doesn’t actually contain (fake reviews, fake FAQs). Google penalizes this, and rightly so.
• Duplicate or conflicting types on the same page (two LocalBusiness blocks with different hours).

Validate with the Rich Results Test and the Schema Markup Validator. Then check Search Console’s Enhancements reports for what Google actually parsed, which sometimes differs from what the validator says.

<script type="application/ld+json">
{
 "@context": "https://schema.org",
 "@type": "LocalBusiness",
 "name": "Example Co",
 "address": {
 "@type": "PostalAddress",
 "streetAddress": "123 Main St",
 "addressLocality": "Commack",
 "addressRegion": "NY",
 "postalCode": "11725"
 },
 "telephone": "+1-631-555-0100"
}
</script>

Keep NAP (name, address, phone) consistent with your Google Business Profile. Mismatched data is a common local ranking drag.

5. Keyword Cannibalization and Internal Link Structure

If two pages on your site target the same intent, they compete with each other and neither wins. This is the quiet killer of local rankings, especially on service sites where every town gets its own page.

How to find it:

• Export Search Console queries, group by query, and look for queries where two or more URLs share impressions.
• Crawl your site and cluster page titles and H1s by similarity.
• Check whether your internal links point to the page you actually want ranking.

Fixes are usually one of three: consolidate the pages into one strong page and 301 the rest, differentiate them clearly by intent, or re-point internal links so the canonical version gets the authority. This is also where good custom web development pays off, because a site built with clean URL structure and templated internal linking is far easier to audit than one hacked together from plugins.

6. Backlinks and Local Citations: Quality Over Count

Backlink audits tend to focus on volume, which is the wrong metric. What matters is relevance, anchor text distribution, and whether the links actually point to pages that can benefit.

Check for:

• Toxic or spammy links (link farms, PBNs, irrelevant foreign directories).
• Broken backlinks pointing to 404s. Reclaim these with 301s or by recreating the content.
• Anchor text that’s over-optimized (exact match on every link looks unnatural).
• Local citations with inconsistent NAP across directories.

For local businesses, a handful of relevant, real citations (chamber of commerce, local trade associations, legitimate industry directories) beats a hundred junk links. If you’re not sure where to start with link building for a local market, working with someone who does Long Island SEO regularly will save you a lot of wasted outreach.

Putting It Together

Run these six checks in order. Crawlability and indexation first, because nothing else matters if Google can’t see the site. Then performance and schema, then cannibalization and backlinks. Fix the biggest problem, wait for it to settle (usually 2 to 4 weeks for indexation changes, longer for ranking shifts), then move to the next one.

An audit isn’t a one-time event. Re-run the crawlability and indexation checks monthly, and the full set quarterly. Most of the value comes from catching regressions early, not from the initial report.

FAQ

How often should I run an SEO audit?

Do a light crawlability and indexation check monthly, and a full audit quarterly or after any site change (redesign, migration, CMS update). Big changes break things silently.

Do I need paid tools to do this?

No. Search Console, PageSpeed Insights, the Rich Results Test, and a free crawler like Screaming Frog (up to 500 URLs) cover everything here. Paid tools speed things up on large sites but aren’t required for most local businesses.

What’s the fastest fix that moves rankings?

Usually fixing indexation problems. If pages you care about are excluded from the index, no amount of keyword or content work will help until that’s resolved.