Best International SEO agencies in France (2026)

Intro

International SEO has become a major growth lever for companies looking to expand into multiple markets. Many businesses today aim to generate traffic and customers in different countries through organic search.

However, an international SEO strategy involves specific challenges. Companies often need to manage multilingual websites, correctly implement hreflang tags, adapt their content to the specifics of each market, and compete in markets with very different levels of competition.

Not all SEO agencies have the experience required to manage this type of strategy. International SEO requires an understanding of local markets, technical expertise related to multilingual websites, and the ability to deploy strategies across several countries.

This article presents a selection of SEO agencies based in France that can help companies develop their visibility internationally.

Best international SEO agencies based in France

The table below allows you to quickly compare several French SEO agencies that support companies operating across multiple markets.

The agencies are compared based on several criteria: their year of creation, team size, the types of companies they support, and their expertise in international SEO.

Comparison table of international SEO agencies in France

Rank	Agency	Year founded	Team size	Types of companies supported	International SEO expertise
1	Onze	2024	2–10	International SaaS, scaleups operating in multiple markets, companies targeting highly competitive keywords	Multi-market SEO strategies, international link building, and local expertise (consultants in different countries, native Spanish speakers and English/Italian bilingual profiles)
2	Eskimoz	2015	200+	Large international companies, multi-country e-commerce businesses, major brands	Multi-country SEO deployments, international teams, and large-scale SEO project management
3	Resoneo	2004	50–100	International brands, marketplaces, and multilingual e-commerce platforms	Technical SEO for complex multilingual websites and large product catalogs
4	Astrak	2023	10–20	International startups and scaleups, tech companies	SEO focused on international acquisition and multi-market organic growth
5	Primelis	2009	50–200	International companies and multi-market acquisition strategies	Data-driven SEO integrated into global marketing strategies
6	Uplix	2020	10–20	International SaaS startups and tech companies	SEO for international acquisition and lead generation
7	SEO Monkey	2020	10–20	International SMEs and e-commerce businesses operating in multiple markets	Pragmatic SEO focused on traffic growth across multiple markets
8	Growth Room	2020	10–20	International startups and scaleups	Growth marketing-oriented SEO for international acquisition
9	Slashr	2021	2–10	Startups and SMEs operating across several countries	Technical SEO for structuring multilingual websites
10	Odiens	2016	10–20	SMEs and companies operating across several European markets	SEO focused on international visibility

Non-exhaustive list based on agencies’ public positioning, the types of projects they handle, and their specialization.

Detailed ranking of international SEO agencies in France

1. Onze

• Year founded: 2024
• Team size: 2–10
• Types of companies supported: International SaaS, scaleups operating across multiple markets, companies targeting highly competitive keywords
• International SEO expertise: Multi-market SEO strategies, international link building, and local market expertise

Onze international SEO agency supports companies that want to position themselves in competitive international markets. In many industries, strategic search queries are already dominated by well-established players operating across several countries. Ranking successfully therefore requires a strong SEO strategy capable of performing across different markets.

This international SEO agency places particular emphasis on international link building, a lever that is often decisive for building a website’s authority across multiple countries. A well-executed authority strategy helps improve domain credibility and compete with companies that already have strong visibility in search results.

Onze also has an international team, with consultants located in different countries and profiles capable of working across multiple markets. The agency notably includes native Spanish speakers as well as English and Italian bilingual consultants, allowing SEO strategies to be adapted to local search behaviors and market specificities.

This understanding of international markets and multi-country SEO challenges allows the agency to support scaleups and ambitious companies looking to grow their organic visibility globally.

2. Eskimoz

• Year founded: 2015
• Team size: 200+
• Types of companies supported: Large international companies, multi-country e-commerce businesses, major brands
• International SEO expertise: Multi-country SEO deployments with local teams

Eskimoz is one of the largest SEO agencies in France and has a strong international presence. The agency has offices in several European countries, allowing it to support companies operating across multiple markets.

Thanks to the size of its team and its organizational structure, Eskimoz is capable of managing large-scale SEO strategies involving multiple languages, multiple countries, and sometimes tens of thousands of pages.

The agency regularly works with international brands and multi-country e-commerce companies that need to deploy SEO strategies across several markets simultaneously. This ability to manage complex multilingual projects makes Eskimoz a structured partner for large-scale international SEO initiatives.

3. Resoneo

• Year founded: 2004
• Team size: 50–100
• Types of companies supported: International brands, marketplaces, and multilingual e-commerce platforms
• International SEO expertise: Technical SEO for complex multilingual websites

Resoneo is one of the oldest SEO agencies in France and has strong experience managing complex SEO projects. The agency frequently works on websites with large multilingual structures, particularly in e-commerce and marketplace environments.

Its expertise is largely based on the technical aspects of international SEO: multilingual website architecture, indexation management, structuring pages by country, and correctly implementing hreflang tags.

Resoneo regularly supports companies that manage large catalogs across multiple markets, with thousands of product or category pages. This technical expertise makes it a relevant partner for businesses whose international SEO structure is particularly complex.

4. Astrak

• Year founded: 2023
• Team size: 10–20
• Types of companies supported: Startups and scaleups operating across multiple markets
• International SEO expertise: SEO focused on international acquisition

Astrak mainly supports startups and technology scaleups looking to grow their organic acquisition internationally. The agency develops growth-oriented SEO strategies with a clear objective: generating qualified traffic across multiple markets.

These strategies typically rely on identifying ranking opportunities in different countries, creating content adapted to local search queries, and optimizing key pages of the website to capture an international audience.

This approach enables expanding companies to increase their visibility across multiple markets and turn SEO into a real driver of international acquisition.

5. Primelis

• Year founded: 2009
• Team size: 50–200
• Types of companies supported: International companies and multi-market acquisition strategies
• International SEO expertise: Data-driven SEO integrated into global marketing strategies

Primelis is an agency specialized in performance marketing. SEO is often integrated into a broader digital acquisition strategy that combines multiple marketing channels.

In an international context, this approach makes it possible to analyze SEO performance across several markets and adjust strategies based on observed results. The agency relies heavily on data to manage campaigns and optimize marketing investments.

This data-driven approach allows international SEO to be integrated into a global strategy aimed at improving acquisition and performance across multiple markets.

6. Uplix

• Year founded: 2020
• Team size: 10–20
• Types of companies supported: International SaaS startups
• International SEO expertise: SEO for international acquisition and multi-market lead generation

Uplix mainly supports startups and SaaS companies that want to grow their visibility across multiple markets. The agency works on SEO strategies designed to generate leads and support the international growth of the companies it works with.

The work often focuses on creating content tailored to different audiences, identifying strategic keywords in each country, and optimizing key pages of the website.

This approach allows SaaS companies to improve their visibility across multiple markets and turn SEO into a sustainable international acquisition channel.

7. SEO Monkey

• Year founded: 2020
• Team size: 10–20
• Types of companies supported: SMEs and e-commerce businesses operating across multiple markets
• International SEO expertise: Pragmatic SEO focused on international growth

SEO Monkey supports a wide range of companies looking to improve their visibility on Google, including businesses operating across several markets. The agency adopts a pragmatic SEO approach focused on achieving measurable results.

The work typically involves identifying ranking opportunities for strategic keywords, optimizing existing pages, and structuring content strategies to develop visibility across multiple countries.

This results-oriented approach enables the agency to effectively support SMEs and e-commerce websites that want to expand their presence across multiple markets.

8. Growth Room

• Year founded: 2020
• Team size: 10–20
• Types of companies supported: International startups and scaleups
• International SEO expertise: Growth marketing–oriented SEO

Growth Room mainly supports startups and technology companies looking to grow their organic acquisition within a broader growth strategy.

SEO strategies are often integrated into a wider growth marketing approach that combines content, website optimization, and the identification of ranking opportunities.

This approach helps expanding companies gradually improve their visibility across multiple markets and attract qualified traffic capable of supporting international growth.

9. Slashr

• Year founded: 2021
• Team size: 2–10
• Types of companies supported: Startups and SMEs operating across several countries
• International SEO expertise: Technical SEO for multilingual websites

Slashr mainly supports startups and small businesses looking to improve the technical foundations of their SEO, particularly in an international context.

The agency frequently works on issues related to multilingual website structure, indexation optimization, and the implementation of SEO best practices.

This type of support helps companies build a solid SEO foundation to grow their visibility across multiple markets.

10. Odiens

• Year founded: 2016
• Team size: 10–20
• Types of companies supported: SMEs and companies operating across several European markets
• International SEO expertise: SEO focused on international visibility

Odiens supports various companies in their search engine visibility strategies, including businesses operating across several European markets.

The agency frequently works on projects aimed at improving website presence in search results across different countries and strengthening international visibility.

The strategies implemented generally focus on improving rankings for relevant queries in each market and progressively building the company’s presence in international search results.

How to choose an international SEO agency in France

Choosing an SEO agency for an international project requires more than standard SEO expertise. A multi-country strategy involves technical, linguistic, and competitive constraints that vary from one market to another.

Before selecting an agency, it is therefore important to evaluate several key elements.

Understanding the challenges of international SEO

International SEO is not simply about translating a website into multiple languages. An effective strategy must take several technical and strategic factors into account.

Managing multilingual websites is one of the first major challenges. Companies must structure their websites clearly so that search engines understand which pages are intended for each country or language.

This includes correctly implementing hreflang tags, which tell Google which version of a page should be displayed to users depending on their language or geographic location.

International SEO also requires adapting content to local markets. The keywords people search for, the expressions they use, and the search intent behind queries can vary significantly from one country to another. A simple translation is rarely enough.

Finally, companies must choose the right international website structure:

• Country-specific domains (example: site.fr, site.de)
• Subdomains (fr.site.com, de.site.com)
• Subdirectories (site.com/fr/, site.com/de/)

Each option comes with its own advantages and SEO constraints. An experienced agency should be able to recommend the structure that best fits the project.

Verifying the agency’s international experience

Not all SEO agencies are used to working on international projects. Before choosing an agency, it is important to evaluate its experience in this area.

International client references can provide a good indication of the agency’s real experience. They help determine whether the agency has already supported companies operating across multiple markets.

It is also useful to verify whether the agency has experience working with multilingual websites, since these projects often involve specific technical challenges such as language management, page indexing, and website architecture.

Finally, knowledge of local markets is an important factor. Understanding search behavior, competitors, and user habits in each country helps build more effective SEO strategies.

Evaluating the proposed international SEO strategy

An international SEO agency should be able to present a clear strategy for improving a website’s visibility across multiple markets.

This often includes a multi-market content strategy, with pages tailored to the search queries used in each country.

An international link-building strategy is also an important component. Obtaining backlinks from relevant websites in the targeted countries helps strengthen a site’s authority within those markets.

A good agency should also be able to prioritize markets. In some cases, it may be more effective to focus on a few strategic countries before gradually expanding the SEO strategy to additional markets.

Finally, the strategy must be built with a long-term perspective, since international SEO often requires several months to produce meaningful results.

Frequently asked questions about international SEO

What is the best international SEO agency in France?

There is no single “best” SEO agency for every international project. The right choice mainly depends on the type of company, the targeted markets, and the level of competition for strategic keywords.

Some agencies are particularly suited to startups and technology scaleups looking to expand quickly across multiple markets. Others have larger teams and are structured to support large enterprises or international e-commerce platforms.

The most important factor is choosing an agency that has real experience with multi-country projects, understands the technical challenges of multilingual websites, and can adapt SEO strategies to the specificities of each market.

Why is international SEO important for a company?

International SEO allows companies to generate traffic and customers across multiple countries through search engines.

Many users directly search for products, services, or solutions on Google in their own language. An international SEO strategy therefore helps capture this demand and expand a company’s visibility across different markets.

Unlike paid advertising, SEO can generate results over the long term. Once a website ranks well for strategic queries in several countries, it can continue generating qualified traffic without relying on a constant advertising budget.

How much does an international SEO strategy cost?

The cost of an international SEO strategy depends on several factors:

• the number of targeted countries
• the size of the website
• competition on the targeted keywords
• content and link-building requirements

In practice, budgets can vary significantly. Some companies begin with a limited strategy focused on one or two markets, while others deploy SEO strategies across several countries simultaneously.

More complex projects often require substantial work on content, technical optimization, and website authority. The budget must therefore be aligned with the scale of the strategy and the company’s international growth objectives.

How long does it take to see results with international SEO?

International SEO is a medium- to long-term strategy. Results are rarely immediate, as building a website’s authority in each market takes time.

In most cases:

• the first improvements may appear after a few months
• significant results often occur between 6 and 12 months

These timelines depend on several factors, including keyword competition, the authority of the website, and the quality of the SEO strategy implemented.

Once rankings are achieved, SEO can become a sustainable acquisition channel, capable of generating traffic and customers across multiple markets.