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.

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SEO specialists

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

Collaborate

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

Personal

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

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Do you want to know more about SEO? Could your website use a new boost?
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Most recent blogs

All about SEO

9 handy Chrome extensions for SEO specialists

6-10-2025 Other Sanne Pasterkamp Kramer

I use Chrome extensions almost every day. They make performing certain tasks a lot easier. Sometimes I want to quickly see if there is a redirect on a page or know how the metadata is filled in. Extensions then save me a lot of time.Out of curiosity, I asked my colleagues about their favourite extensions. That yielded a list of useful tools for SEO specialists, developers, content marketers and webmasters. What are Chrome extensions? Chrome extensions are small extensions you add to your browser.

From search engine optimisation to search everywhere optimisation

30-9-2025 AI (Artificial Intelligence) Mariska Snoek

It hasn't escaped anyone's notice, the SEO landscape has changed. SEO is no longer just about findability in Google. More and more people are searching in other places: on social media, in AI chatbots or directly in online shops. This shift calls for a broader strategy: Search Everywhere Optimisation. With this, you don't focus on one channel, but on all the places where your target audience actively searches. What does Search Everywhere Optimisation mean? Search Everywhere Optimisation means not limiting your visibility to search engines alone,

ChatGPT alternative

The 7 best alternatives to ChatGPT in 2025

24-9-2025 AI (Artificial Intelligence), Other, Test sub Jelle Brink

ChatGPT is the best-known AI chatbot worldwide, and for good reason. The model excels in text generation, brainstorming, analytics and even code. But that doesn't always make it the best choice for a specific task. Sometimes another AI tool is a better fit. For example, if you value low cost, factual accuracy or direct interfacing with Microsoft 365 more. In such cases, a ChatGPT alternative can be handy. We tell you the 7 strongest ChatGPT alternatives for 2025. By tool

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
Team photo SEO desk Onder

Read our testimonials!

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 onderneming 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

Webmaster

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 discuss everything.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!

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