SEO agency Onder

SEO is the foundation of your website and supports your online marketing mix

Your website will continue to grow thanks to clear and progressive SEO advice. You always keep control of the SEO process thanks to a pre-coordinated, transparent and open working method. Together we will achieve great results for your website because, as your SEO consultancy, we are 100% SEO focused, no matter what your SEO question is.

SEO services Check out our training courses!
SEO consultancy, SEO agency Onder

SEO Specialists

We are a specialist SEO agency and focus 100% on search engine optimisation. This is reflected in clear advice and smart suggestions.


Pleasant cooperation is important to us. We are involved, thoughtful and proactive. And are happy to share our knowledge with you and your team.


We like a personal approach. We have a no nonsense attitude and are always honest and transparent in our working methods and services.

Free Live SEO Analysis

Wondering how your website is doing in Google?

Live SEO analysis

See our collaborations


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Technical SEO

The technical state of your website is the foundation for SEO succes. We look at the technical aspects and check whether they comply in terms of SEO.

Technical SEO

Outsource link building

What is link building and why is it important? Link building is getting referrals to your website on other websites. It is essential for better findability in search engines and more organic traffic. What is link building? Link building, which is actually better called "building authority", involves getting other websites to link to your website. This increases the credibility and authority of your website in the eyes of search engines. Link building is obtaining mentions (backlinks) on other websites to

Outsource link building
SEO audit check of SEO office Onder

SEO audit

Our SEO audit gives you a clear overview of the areas of concern. Concrete points of improvement for a better findability of your website.

SEO audit
Keyboard typing

SEO copywriting

A SEO copywriter will help you with excellent content that is also suitable for search engines. It's all about quality and answering the right search intent.

SEO copywriting

Conversion optimisation

We provide conversion improvements within websites and web shops through analysis, ideas, A/B testing and other forms.

Conversion optimisation
SEO advice and a SEO consultancy at SEO agency Onder

SEO advice

A successful website requires good visibility. We onder support you with advice on search engine optimisation (SEO).

SEO advice
SEO migration at SEO agency Onder

SEO migration

We provide SEO support for a new website or redesign. A solid SEO migration will maintain and even improve organic traffic!

SEO migration

Any questions?

Do you want to know more about SEO? Could your website use a new boost?
Get in touch

Most recent blogs

All about SEO

Writing for SEO: the HUMMSTAL method

18-6-2024 (Content) marketing, How to/DIY Ineke Withaar-Colijn

Writing for SEO is about adding SEO elements so that search engines better understand what your page is about. There are 8 key on-page SEO elements. For our SEO training courses, I developed a mnemonic: HUMMSTAL. With this, you will never forget a SEO element again and ensure a good foundation for your findability. Let's get started! HUMMSTAL stands for Why write for SEO? When I give SEO training, I always ask, "Who are you creating a webpage for?". There is no one who says, "For

The role of social media on your SEO results

13-6-2024 (Content) marketing Mariska Pike

For a long time, we really saw social media separately from SEO and said it had no impact on your SEO results. However, we have since changed our opinion and believe that social media definitely contributes positively to your SEO results. All but a few people use some form of social media (and usually more than one). So be sure to address your target audience on social media. Google, of course, is not

Building authority within a cluster? This is how we do it

6-6-2024 (Content) marketing, EEAT, How to/DIY Jesse Commandeur

To rank well in Google, your website must comply with E-E-A-T guidelines. Therefore, you need to make sure you target all onder parts of E-E-A-T. In this article, we will tell you more about creating clusters around certain onderwerpen. We also tell you more about building authority around key search terms. How do you start? First, do a search analysis for your website. You find out which terms have a lot of search volume and little competition. This

This is us!

A team of SEO specialists

Our team consists of enthusiastic SEO specialists who are happy to work with you for the best results.

Meet our team

These customers are supupside down from us!

Renzo van Dongen

Renzo van Dongen

Digital content manager Peugeot

Whether it's about content or technical adjustments, it doesn't matter. Martijn briefs this in a very clear way so that it can be implemented locally or by our head office in France. [...] Since the start of our collaboration, we have achieved great results. Keep it up!

Marien van Stegeren

Eigenaar Kitcentrum

When your online onder venture grows, expectations often grow too, in every area. To a large extent, we were in control of SEO and its interpretation ourselves. We found out that our own "general view" was no longer sufficient, so we engaged Bureau Onder. Surprising and clear. We have built up a fine collaboration, partly because Martijn also regularly visits our office with Eline or Mariska (depending on the case), which is very valuable to us!

Marten Stellingwerf


Martijn and Mariska make the SEO story understandable for the layman and are happy to think along with us. It is nice that there is a personal contact moment every month with an extensive report and the opportunity to talk everything through. After just a few months, Onder has already managed to achieve number 1 positions on Google with some of our webshop pages. We are very satisfied with Onder.

Mark Prummel

SEO Specialist Stella Fietsen

For several years, Onder has been a valued partner of Stella. Martijn is my sparring partner for complex SEO issues and the extra pair of critical eyes that keeps us on our toes. Together, we have achieved nice growth in online visibility, visitor numbers and leads. Onder onder stands out for its short lines of communication and professionalism. They speak our language: don't nag, get down to business. That is what we love!


Don't miss a single SEO insight
  • Insights on SEO
  • For beginners and advanced specialists
  • From experiments to developments at Google and from
    best practices to our own cases
  • A look behind the scenes at Onder

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