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!
Team photo SEO desk 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.

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.

Free live SEO Analysis

Wondering how your website is doing in Google?

Live SEO analysis

See our collaborations

Services

View our services

AI SEO

AI & Onder: life is one big experiment We have been embracing AI for quite some time. Over the past few months, this has gained momentum and in the coming months, that momentum will accelerate. We'd like to take you through our journey. AI SEO Google is a search engine. Bing is a search engine. But ChatGPT, Perplexity and Claude are LLMs (Large Language Models). Based on a prompt, you get an answer or a refinement. With that, these are almost more

AI SEO

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 linkbuilding

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 linkbuilding
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 optimization

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

Conversion optimization
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 optimization (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
Google sheet promt gear generator

How do you create a prompt generator that works for your business?

26-6-2025 (Content) marketing, AI (Artificial Intelligence), How to/DIY Ivo Nijboer

Creating a prompt generator in Google Sheets is a powerful way to generate structured and consistent prompts for your AI, such as ChatGPT or Gemini. This allows you to improve your SEO strategy by providing structured input to your AI tools. My set-up for the prompt generator was inspired by the one Aleyda Solis once published. I have adapted and further developed her input and structure so that I now have sufficient experience and knowledge to

alt attribute

What is alt text and how do you write it properly?

19-6-2025 Other Sanne Pasterkamp Kramer

In April, I was with colleagues at brightonSEO, the largest SEO conference in the world. I attended several interesting talks, but one of the speakers who really got me thinking was Liam Cumber. His talk was called "What the f**k is alt-text and how do you write it?". Just before the conference, I was wondering how I am actually supposed to write alt-text. After all, I - and probably many SEO specialists and website administrators with me - only dropped a keyword in

AI developments and the impact on SEO

28-5-2025 Other Martijn Hoving

AI overlays have been more prominent in Google's search results for a week now, and in addition, last week was Google I/O, where a number of important announcements were made. A good reason to explain more about the expected impact of recent developments on SEO. But also to give an insight into the three AI chapters we are now working hard on in the background and share our views regarding changes in SEO strategy. Google I/O:

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 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

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 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!

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