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There are hundreds of online marketing agencies in the Netherlands, and almost all of them promise the same thing: more traffic, higher conversions and better visibility. So how do you make a choice you won't regret afterwards? In this article, we give you 7 concrete criteria for choosing the right online marketing agency, honestly and without the marketing speak.
For many companies, choosing an online marketing agency is an investment of thousands to tens of thousands of euros a year. And yet that choice is often made on the basis of one conversation, a nice website or a friendly quote. The result: projects that don't deliver what they promised, frustration over communication or, worse still, marketing budget that disappears without visible results.
This article is written for marketing managers, business owners and management team members who are looking for an online marketing agency and want to find the right partner, not just the smoothest talker. We list 7 criteria that make the difference between a pleasant, productive collaboration and an expensive learning experience.
An online marketing agency helps companies achieve their online goals through a combination of services such as SEO, Google Ads, social media advertising, conversion optimisation (CRO), content marketing and data-driven analysis. The difference between a good and an average agency isn't in which services they offer, but in how they use those services strategically for your specific situation.
Many companies start their search with the question: are we looking for a specialist agency or a full-service partner?
A specialist agency focuses on one or two disciplines, such as SEO, Google Ads or social media. Advantage: deep expertise, high effectiveness within that domain. Disadvantage: you often need several agencies for the full picture, which costs extra coordination.
A full-service agency covers the whole playing field, from SEO and SEA to CRO, social and analytics. Advantage: one point of contact, a coherent strategy, integrated steering on results. Disadvantage: not every full-service agency is equally strong in every discipline, so check the specialisms within the agency carefully.
The right choice depends on where you stand. Do you already have a strong marketing department that only needs help on one point? Then a specialist makes sense. Do you need an integrated approach and strategic sparring? Then a full-service agency is a better fit. View our online marketing services to see which combination of services suits your situation.
An agency with experience in your sector knows the audience, the search terms, the competitors and the typical pitfalls. That saves months of onboarding and delivers results faster.
So in an introductory meeting, always ask: which sectors do you work in a lot, and what has that delivered? An agency that only has e-commerce clients often understands B2B software less well, and vice versa. Sector experience also means the agency understands the regulations, buying behaviour and lead qualification in your sector.
At DGTLbase, we work in many different sectors. Thanks to those specialisms, we know exactly which channels, content and strategies work in each sector, and which mainly cost budget without results.
An honest caveat: an agency that claims to be “at home” in every sector rarely is. Ask for concrete cases within your sector.
This may well be the most important criterion, and at the same time the most neglected. Most agencies pitch on channels: “We do SEO”, “We run Google Ads”, “We handle your social”. But channels are means, not goals. A good online marketing agency doesn't start with the channel, but with the business behind the channel.
An agency that looks beyond channels asks questions such as:
A channel-focused agency optimises individual parts. A strategic agency optimises the whole. You'll hear that difference within ten minutes of an introductory meeting: does the agency mainly ask tactical questions (“which keywords are you using now?”), or does it look for the strategic context (“where do you want to be in a year and what's standing in the way?”).
The effect of strategic thinking is big. An agency that looks beyond channels often discovers that the problem isn't where the client thinks it is. Sometimes better positioning turns out to deliver more than more advertising budget. Sometimes a CRO project makes more sense than extra traffic. Sometimes content marketing is more powerful than paid. You can only make that trade-off if you look beyond the channel the agency happens to be good at.
A good online marketing agency shows what it does, how it works and what it delivers. Without foggy reports or dashboards you never understand. Ask specific questions:
Transparency isn't a luxury, it's the basis of trust. An agency that's difficult about giving insight into its work often has something to hide, or doesn't really know what it's doing itself. Good agencies report on results and on process. You don't just get figures, you also get context.
Talk is cheap. Results are what count. Ask every agency for concrete cases, preferably in your sector or with comparable companies. Pay attention to:
Reviews on platforms such as Google, Clutch or Trustoo give a more honest picture than testimonials on the agency's own website. Look especially at the less positive reviews to see how an agency deals with criticism.
An honest caveat: no agency wins every pitch or delivers top results for every client. An agency that only presents success stories isn't telling the whole story. Read more about our approach and results to see what we do and don't promise.
This criterion is often underestimated, but it's decisive. You'll be working with this agency for months or years. If the chemistry isn't right, every meeting becomes a chore and every decision a discussion.
In an introductory meeting, pay attention to:
An agency that feels like a partner from the start usually stays that way during the collaboration. An agency that already struggles to listen in the pitch won't suddenly do better in the execution.
Finally, the business side: the type of contract says a lot about how an agency approaches the relationship. Some agencies work with annual contracts and fixed monthly fees, others with shorter terms or fee-per-result. No type is better by definition, but every type has consequences.
Important questions in advance:
And then the budget: this is where we see the most mismatches. A company wants to double its organic traffic within six months, but has budget for two hours of SEO a month. That won't work. For SMEs and scale-ups, a serious online marketing project is often between €1,500 and €10,000 a month, depending on scope, sector and ambition. Below that budget, you often only get standalone execution, not strategy.
An honest caveat: an agency that only offers long contracts without flexibility is shielding itself. An agency that works only on a no cure, no pay basis often takes risks with
Besides the 7 criteria, there are a few pitfalls we often see at companies that later switch agencies:
A good selection takes time, but saves you months of frustration and thousands of euros of lost budget afterwards.
The right online marketing agency isn't the one that shouts loudest or gives the best pitch. It's an agency that thinks along honestly, works transparently, has experience in your sector and has the right chemistry with you. A partner who stands beside you, not in front of you.
The 7 criteria in this article are a checklist that helps you look past the marketing speak. Use them in every introductory meeting and ask them out loud. The way an agency answers them often says more than the answers themselves.
Request a free introductory call
And together we'll see whether there's a match, honestly and without obligation.
When is it time to bring in an online marketing agency?
It's time to bring in an online marketing agency when you lack the internal knowledge or capacity to realise your growth ambitions, your marketing budget is rising without clear results, or your organisation is ready for a professional strategy instead of ad hoc actions. Many companies bring in an agency when they're growing, internationalising or after a major investment in their product.
What should I have ready for a first meeting with a marketing agency?
For a good introductory meeting, you need three things: a clear picture of your commercial goals for the next 12 months, insight into what you're spending on marketing now and what it delivers, and access to your most important data (Google Analytics, advertising accounts, CRM). The sharper your input, the more valuable the advice you get back.
Is a large or small marketing agency better for my business?
A large marketing agency offers scalability, broad expertise and stable processes, but often works less personally and is usually more expensive. A small agency offers personal attention, short lines of communication and flexibility, but may be more limited in staffing. For SMEs and scale-ups, a small to medium-sized agency is usually the best fit, because senior expertise is directly involved in your account.
Can a marketing agency also help if I already have an in-house marketer?
Yes, many companies actually work with a hybrid model: an in-house marketer for strategy, brand management and coordination, supported by an agency for specialist execution (such as SEO, advertising or CRO). This model combines the best of both: internal knowledge of your product and market, plus external expertise in fast-changing channels. Many scale-ups and SMEs are choosing this in 2026.
