Glow Mark Agency

Technical SEO Audit

Before you write a single line of content or earn a single backlink, your site needs to be technically sound. A technical SEO audit reveals everything stopping Google from understanding, crawling and ranking your pages correctly.

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A site can have the best design and content in the world, if it's slow, poorly indexed, or riddled with technical errors, Google will never show it to the right people. The technical SEO audit is the mandatory starting point of any serious SEO strategy, it's also the first step of our free trial.

We analyze your site with the same tools and criteria Google uses to assess page quality: load speed, Core Web Vitals (LCP, INP, CLS), URL structure, HTML markup, indexation, internal linking, mobile compatibility and security.

Ignoring technical fundamentals has a direct cost: a slow-loading page loses a large share of its mobile visitors before its content even appears, and a simple indexation error can make an entire page invisible on Google, regardless of how good its content is. These problems are often invisible from your own browser, but perfectly measurable with the right tools, which is exactly what this audit reveals.

For a trilingual site like most Belgian businesses run (FR/NL/EN), the audit covers a point generic tools often miss: hreflang tags. A misconfigured hreflang tag can cause Google to show your Dutch version to a French-speaking visitor, or worse, treat your three versions as duplicate content and index only one of them. It's one of the most common technical issues we find on Belgian multilingual sites, and one of the costliest in lost traffic.

We also pay close attention to the site's history: a poorly handled redesign or CMS migration almost always leaves missing or chained redirects behind, which dilute the authority your older pages had built up. If your site has changed platform, URL structure, or CMS in recent years, that's often the first source of lost traffic we identify.

Many of our Belgian clients discover, during this first audit, that a meaningful share of their pages is never actually crawled by Google: either accidentally blocked in robots.txt, or simply not linked to from anywhere else on the site. This kind of problem is invisible while browsing the site normally, but it directly translates into pages that will never generate a single visitor from organic search, no matter how good their content is.

What the audit covers

How we work

  1. 1

    Full technical crawl

    We crawl your site the way Googlebot would, page by page, to identify every technical blocker.

  2. 2

    Core Web Vitals analysis

    We measure real performance on your most important pages, on mobile and desktop, using field data where available.

  3. 3

    Clear, prioritized report

    You get a readable document, free of unnecessary jargon, ranking every issue by potential SEO impact.

  4. 4

    Priced action plan

    We offer a free quote for implementing the fixes, with a realistic timeline.

  5. 5

    Multilingual check

    For FR/NL/EN sites, we specifically check the hreflang setup and confirm there's no duplicate content between language versions.

Who this audit is for

Your organic traffic is flat or declining

A technical audit often reveals causes invisible to the naked eye: deindexed pages, crawl errors, excessive load times.

You're launching a new site or redesign

Better to fix the technical foundations before investing in content and link building.

You don't know why you're not ranking

If your content is good but nothing's happening in Google, the problem is almost always technical.

Your site recently changed platform or URLs

A poorly executed migration often leaves missing redirects that lose the authority your older pages had built up, an audit confirms this quickly.

What you actually receive

Detailed PDF report

A structured 15-to-25-page document depending on your site's size, ranking every issue by impact and effort to fix.

Key-metrics dashboard

A quantified snapshot of your starting point (indexed pages, Core Web Vitals, errors) to measure progress over time.

30-to-45-minute walkthrough call

We go through the results together and answer your questions, without technical jargon.

Detailed quote for implementation

If you'd like us to fix what we found, you get a priced plan with a realistic timeline.

Frequently asked questions about the technical audit

Yes. The initial analysis of your site is part of our free, no-obligation trial. You get a clear report before deciding to work with us.

INP (Interaction to Next Paint) officially replaced FID as Google's Core Web Vitals metric in March 2024. It measures your site's responsiveness across the entire visit, not just the first interaction, a more complete picture of real user experience.

The initial analysis usually takes 3 to 5 business days depending on your site's size. You then receive a detailed report and a call to discuss it.

Yes, if you'd like. The audit becomes the basis for a free quote to implement the technical fixes, as part of a 3, 6 or 12-month campaign.

We combine Google Search Console and Google Analytics 4 for your site's real data (indexation, traffic, behavior), alongside our own technical crawling tools. That data stays yours, accessible from your own Google accounts.

That's still valuable information: it means your efforts should focus on content and link building rather than technical fixes. The report remains useful for prioritizing the next steps of your SEO strategy.

Yes, as part of the initial free trial: we compare your technical standing to 2 or 3 direct competitors to give you a realistic picture of your room for improvement.

Yes, it's something we check systematically for FR/NL/EN sites: a misconfigured hreflang setup is one of the most common causes of international duplicate content, invisible without a dedicated audit.

You're free to use the report however you like, including with another agency or in-house. If you'd like us to handle the fixes, we provide a detailed quote with no obligation to proceed.

Yes, the audit methodology relies on platform-independent criteria (indexation, speed, structure): we've applied it to WordPress, Shopify and Webflow sites as well as custom builds.

Yes, we pay particular attention to the pages driving the most traffic or conversions, since a performance issue there has a direct commercial impact, well beyond the technical score alone.

We include them in the analysis if you'd like, since Google often treats them as separate entities: a misconfigured subdomain can have its own indexation issues independent of the main domain.

Yes, that's a core part of the report: every issue is ranked by estimated SEO impact and implementation effort, so you know exactly where to start.

Our other services

On-page optimization & content

Link building

Local SEO

Multilingual SEO strategy

Website Design & Redesign

GEO: SEO for Generative AI

Semrush Alternative

Available across Belgium

AntwerpBrusselsGhentLiège

Find out what's holding your site back in Google

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Technical SEO Audit in Antwerp | Glow Mark Agency