SEO Audit: What It Is, What It Checks, and How to Improve Your Search Visibility

What an SEO audit is and why you need one

SEO (search engine optimization) is everything that makes your site clear to a search engine and easy for a person to use. An audit is a diagnosis of that state — like a vehicle inspection: you learn what works, what's worn out, and what will break down the road.

Why it matters:

• Find what's invisible from the outside. Broken links, duplicate pages, missing titles, or indexing problems aren't visible to a normal visitor, but they're exactly what keeps a site out of search results.
• Understand why traffic isn't growing. If the content is there but rankings aren't, the cause is almost always technical or content-related — an audit pinpoints it.
• Get a plan, not generic advice. A good audit ends with a prioritized list of fixes: what pays off quickly and what's for later.

Important: an audit by itself doesn't lift a site in the rankings. It shows you what to fix. Results come from the fixes.

More about ProLeadly — who runs the audits and does the fixes.

What an SEO audit checks: 7 blocks

A full audit looks at a site from several angles. At ProLeadly we split the check into seven blocks — the free tool follows the same structure:

• On-page SEO — title, description, H1–H6 headings, content and markup. Why it matters: this is what a search engine reads first to understand what the page is about.
• Speed — server response time, page size, number of requests. Why it matters: a slow site loses both rankings and visitors, people don't wait.
• Usability — mobile layout, readability, accessibility. Why it matters: more than half of search happens on phones, and a clunky site pushes people away.
• Security — HTTPS, certificates, headers, email authentication. Why it matters: without HTTPS, browsers and users don't trust the site.
• Links — broken links, link text, outgoing links. Why it matters: broken links hurt the experience and signal carelessness.
• Social — how the page looks when shared, social profiles. Why it matters: a proper preview in a messenger raises clicks.
• AI search — whether AI assistants can read and cite the page. Why it matters: this is a new traffic channel — Google AI Overviews and chat assistants.

The first three blocks give the fastest payoff. If a page has no title or takes more than a couple of seconds to load, the rest barely matters — a search engine can't evaluate it properly.

You can run a site through all seven blocks on the free audit page — a 0–100 score in a minute.

How to run an SEO audit yourself: 7 quick steps

If there's no budget for a specialist, start with a self-check. It won't replace a deep audit, but it clears the most common problems.

1. Check indexing. Type site:yourdomain.com into search. If there are no pages or fewer than you actually have, the site is not indexed — that's problem number one.
2. Check the title and description of every important page. Every page should have its own unique title with the target keyword, not “Home” or “Untitled”.
3. Look at the headings. Exactly one H1 per page, then a logical H2–H3 hierarchy.
4. Run the page through PageSpeed. Check mobile speed separately — that's what Google evaluates.
5. Open the site on a phone. Make sure nothing breaks and buttons are tappable.
6. Find broken links. Check the menu, footer, and internal links — do they go where they should?
7. Share a page in a messenger. If the preview has no image and description, you're losing clicks when people share.

Each step can be done by hand, but it's slow. Faster to run the free check that goes through all seven blocks at once and returns a 0–100 score with a fix list.

Start the free audit — no sign-up and no card required.

Why the audit now includes an “AI search readiness” block

Search in 2026 is no longer just ten blue links. According to Semrush, in March 2025 AI Overviews appeared on 13.14% of US search queries — up from 6.49% just two months earlier. Pew Research Center recorded about 18% of queries with an AI summary, and in 88% of cases the summary cited three or more sources. Ahrefs’ separate measurements put AI Overviews at roughly 16% of queries and note that 26% of brands have zero mentions in them.

Where the numbers come from:

Semrush — AI Overviews on 13.14% of US queries in March 2025.

Pew Research Center — about 18% of Google searches got an AI summary, 88% of them citing three or more sources.

Ahrefs — AI Overviews on roughly 16% of queries, and 26% of brands with no mentions.

What this means for a regular site:

• AI assistants cite what they can read. Structured text with clear headings and markup gets quoted more often than an unstructured wall of text.
• The traffic channel is changing. Users increasingly get the answer right in the results and never reach the site. To even get mentioned, your page has to be machine-readable.
• The “AI search” check is a quick way to see whether an assistant can read and cite your page: proper markup, semantics, accessible content.

This isn't a replacement for classic SEO — it's a layer on top. The basics — indexing, speed, content — still decide everything.

Free tool vs. deep audit: what's the difference

A free automated check is a quick snapshot of a site's condition: it finds technical and on-page problems and gives a score. It can't:

• analyze competitors and their strategy;
• assess content quality and completeness relative to the niche;
• build a content plan and keyword map;
• design a link-building strategy.

If the automated check shows a low score, or you've already cleared the basic errors but traffic still isn't growing, you need a review tailored to your task. At ProLeadly we look at a site as engineers: we find the problem and immediately say how to fix it in code, rather than just describing the symptom.

The fixes are our day job: AI development for custom features that off-the-shelf tools cannot cover.

Chat bots and integrations take over orders, support and follow-ups.

If traffic has to turn into bookings, look at WhatsApp Booking.

What to do with the audit results

The rule is simple: first the things that pay off fast and cheap.

1. High priority — indexing, broken pages, missing titles, slow loading. This blocks everything else.
2. Medium priority — duplicates, heading structure, internal links, mobile usability.
3. Low priority — share previews, structured data, small speed improvements.

Don't try to fix everything at once. Close the critical items first, measure the result, then move to the next layer.

More practical guides on sites, bots and automation are in the ProLeadly blog.