This list highlights 8 of the best international SEO agencies based in London, each bringing unique strengths to the table. Whether you’re a growing SaaS company or an enterprise brand looking to expand into new markets, there’s an agency here that can help you reach your goals.
Here’s a quick overview of the top contenders:
- Flying Cat: Best multilingual international SEO agency for B2B SaaS companies
- GA Agency: Best for luxury brands and global enterprises with complex markets
- Pearl Lemon: Best for lean, fast-turnaround SEO campaigns
- Mintense: Best for European market specialists and multilingual PPC campaigns
- Bird Marketing: Best for industry-specific SEO strategies with a global reach
- Adapt Worldwide: Best for large-scale multilingual campaigns with deep localization
- POLARIS: Best for data-driven SEO in e-commerce and B2B sectors
- Re:signal: Best for award-winning SEO strategies in e-commerce growth
Keep reading to learn what makes each of these agencies stand out and how they can support your international SEO goals.
đź’ˇ Having trouble knowing how to pick the right agency?
We whipped up a guide on how to find and vet the right SEO agency
Download the guide
Flying Cat: Your AI-focused strategic partner for global b2b growth
Hey there! Full transparency – this is us writing this piece. We’re including ourselves because we’ve built a solid track record of helping Series B+ SaaS companies expand globally through SEO. Our strength comes from merging deep technical SEO expertise with native-language content creation. Plus, with our roots in translation services, we understand that successful international SEO requires more than just converting keywords – it needs market-specific strategy and implementation.
We also don’t just focus on traditional SEO. We’re preparing clients for the future of search by leveraging data science and machine learning to predict and adapt to search behavior changes.
AND our team takes content beyond – from creating thought leadership content, research reports, and repurposing your content into social media posts or video scripts – we’ll be a full stack, integrated content partner.
Languages & Markets:
- UK, US, and Canadian English
- French
- Italian
- Spanish
- German
- Dutch
- Portuguese (Brazil & Portugal)
- Most other EU markets
Notable Results:
- 500% increase in demo requests (10 months)
- 227% MRR growth (6 months)
- 0 to 30k monthly visits (12 months) competing with Miro and Zoom
Core Services:
- International SEO strategy
- Technical SEO and audits
- Content strategy and creation
- Digital PR and link building
- International keyword research
- On-page optimization
- Content management
- Programmatic SEO
Industry Focus:
- B2B SaaS (Series B+)
- MarTech
- SalesTech
- HR Tech
- Enterprise software
Capture new markets with international SEO
Find out how our multilingual, multi-region team can help you drive international traffic and conversions.
Get a marketing consultation
GA Agency: Data-driven international marketing at scale
GA Agency, based in London, combines strategic planning with data-driven execution to help global brands expand their digital footprint. Founded by former Google and Expedia expert Guido Ampollini, they’ve built a reputation for delivering measurable growth across international markets.
Languages & Markets:
- 18 languages including English (UK & US)
- Full European coverage: French, German, Italian, Spanish, Dutch
- Eastern European markets: Czech, Hungarian, Polish, Romanian, Ukrainian
- Asian markets: Japanese, Indonesian
- Nordic coverage: Swedish
- Additional markets: Greek, Turkish, Russian, Portuguese
Notable Results: Major fashion and luxury brands trust GA Agency to scale their international presence:
- Calzedonia
- Prada
- Technogym
Core Services:
- International SEO strategy
- Data-driven digital marketing
- Long-term strategic planning
- Short-term tactical implementation
- Custom regional strategies
- Performance tracking
Industry Focus:
- Fashion and luxury
- Travel
- Fitness
- Luxury stationery
- Automotive
- Streaming services
- Food
- Cryptocurrency
Pearl Lemon: From McDonald’s to page-one rankings
Here’s a different kind of SEO success story. London-based founder Deepak Shukla bootstrapped Pearl Lemon from a McDonald’s in Fulham Broadway to generating $20,000 monthly revenue in under six months. These days, they focus on landing their clients on page one of Google through proven SEO techniques.
Languages & Markets:
- Primary focus on English-language markets
- UK and US presence
- Global client reach
Notable Results: Pearl Lemon has delivered strong SEO performance for clients like:
- Astteria
- Elevano
- Book Like a Boss
Core Services:
- SEO audits
- SEO penalty recovery
- Strategy consultations
- B2B lead generation
- Email campaigns
- LinkedIn optimization
- Cold calling
- Appointment setting
Industry Focus:
- B2B companies
- Small to medium enterprises
- Startups
- Corporate clients
Mintense: European market specialists with a decade of experience
Operating from London, Verona, and Lille, Mintense brings over ten years of expertise in multilingual digital marketing across European markets. Under CEO Emanuele Marogna’s leadership, they’ve mastered the art of blending local market insights with technical SEO excellence. What makes them unique is their deep understanding of European consumer behavior – they know that successful SEO in Milan looks different from SEO in Manchester.
Their approach combines data-driven analysis with cultural adaptation, ensuring campaigns resonate in each target market. Rather than applying one-size-fits-all solutions, Mintense tailors their strategies to match regional search behaviors and purchasing patterns.
Languages & Markets:
- 16 languages
- Full European market coverage
- UK and continental Europe focus
Notable Results: Trusted by global brands including:
- Q8
- Fastweb
- Illinois Tool Works Inc.
Core Services:
- International SEO
- Multilingual Google Ads
- PPC management
- Social media marketing
- Market-specific campaigns
- Cultural adaptation strategies
Industry Focus:
- European market entry
- Cross-border commerce
- International brands
- Regional expansion projects
Bird Marketing: Multi-award winning digital growth since 2010
Bird Marketing stands out in the international SEO landscape through their strategic presence across three major global markets – London, New York, and Dubai. Under Director Philip Young’s leadership, they’ve transformed from a local London agency into a global digital powerhouse that understands the nuances of different search markets.
What makes them particularly interesting is their focus on industry-specific SEO strategies. Rather than applying generic solutions, they adapt their approach based on sector-specific challenges. For example, their work in the financial services sector shows deep understanding of compliance requirements across different regions, while their manufacturing clients benefit from their expertise in complex B2B search behaviors.
Their team structure reflects their international focus – they employ market specialists who understand local search trends and consumer behaviors in each region they serve. This setup allows them to deliver campaigns that resonate with local audiences while maintaining global brand consistency.
Languages & Markets:
- Global reach through strategic office locations
- Multi-region campaign management
- Focus on UK, US, and UAE markets
Core Services:
- Digital marketing strategy
- Technical SEO
- Content optimization
- International market research
- Cross-border campaigns
- Performance tracking
Industry Focus:
- Financial Services
- Manufacturing
- Construction
- Retail & E-commerce
- Fashion
- Technology & IT
- Healthcare
- Education
- Travel & Tourism
Adapt Worldwide: Multilingual performance marketing at scale
As a subsidiary of Welocalize, one of the world’s leading localization providers, Adapt Worldwide is a London-based brings unique capabilities to international SEO. With over 250 languages in their arsenal and offices across key global markets, they’re equipped to handle enterprise-level international campaigns.
The agency’s strength lies in their comprehensive team structure. Managing Director Emma Chun leads a group of specialized directors, each bringing distinct expertise:
- Jon Boon heads conversion and analytics
- Tim Atkins and Friederike Hippenstiel manage strategic accounts
- Tom Meyrick architects data solutions
Their approach combines three key elements that set them apart:
- Data-driven decision making through proprietary analytics tools
- Cultural insights from native-language experts
- Technical SEO excellence from their specialized team
Languages & Markets:
- 250+ languages with native speakers
- Complete global market coverage
- Cultural adaptation expertise
- Regional search behavior analysis
Notable Results:
- ShipStation: Developed and executed international growth strategies resulting in significant market expansion
- VUE: Created and managed programmatic advertising campaigns across multiple territories
- Panasonic: Generated qualified B2B leads in the rugged computing sector through targeted campaigns
Core Services:
- International SEO strategy
- Paid search optimization
- Advanced analytics implementation
- Conversion rate optimization
- Multilingual content marketing
- Data-driven solutions
- Programmatic advertising
- Cultural adaptation
- Technical SEO
Industry Focus:
- B2B technology
- SaaS platforms
- Global e-commerce
- Enterprise technology
- Media companies
- Financial services
- Cross-border retail
POLARIS: Holborn’s data-driven SEO specialists
Operating from the heart of London since 2009, POLARIS has established itself as a powerhouse in data-driven international SEO. Their 15+ years of experience spans everything from technical audits to full-scale international campaigns, consistently delivering above-target results for traffic, rankings, and sales.
What sets POLARIS apart is their scientific approach to SEO. Before launching any campaign, they conduct extensive user profiling and competitor analysis specific to each target market. Their technical team regularly uncovers opportunities that other agencies miss, particularly in complex site architectures and international targeting.
The agency has built their reputation on three core principles:
- Data-first decision making
- Technical excellence in implementation
- Clear, measurable ROI tracking
Languages & Markets:
- Primary focus on UK market
- International campaign management
- Cross-border strategy development
- Market-specific optimization
Notable Results: Proven success with major brands:
- Dune London: Significant growth in international markets
- Sodexo: Complex multi-market SEO strategy
- CACI: B2B visibility improvement across regions
Core Services:
- Technical SEO audits and implementation
- International market research
- Content strategy and optimization
- Digital PR and outreach campaigns
- Site migration planning and execution
- User behavior analysis
- Cross-border SEO strategies
- Performance tracking and optimization
Industry Focus:
- Fashion and luxury retail
- Professional consulting
- Financial services
- Enterprise technology
- Global e-commerce
- B2B services
- International brands
Re:signal: Award-winning e-commerce growth specialists
Founded in 2012 by digital marketing veteran Kevin Gibbons, Re:signal has become a powerhouse in e-commerce SEO. Their approach earned them the triple crown of Best Small SEO Agency awards in 2024 – taking home UK, European, and Global honors. The agency’s success stems from their laser focus on driving measurable organic search growth for ambitious e-commerce brands.
Their methodology combines technical excellence with strategic thinking. Rather than taking a one-size-fits-all approach, Re:signal develops custom strategies based on deep analysis of each market’s unique characteristics. They’re particularly skilled at identifying and capitalizing on market-specific opportunities that other agencies might miss.
Languages & Markets:
- Strong UK market presence
- Established US operations
- European market expertise
- Global reach through remote team structure
- Market-specific strategy development
Notable Results: Impressive track record with major retail brands:
- ASICS: Global SEO strategy implementation
- FatFace: Multi-market organic growth
- Reformation: US market expansion
- JD Sports: Cross-market optimization
- OKA: International market entry
- Under Armour: Global search presence enhancement
Core Services:
- E-commerce SEO strategy
- Technical site optimization
- International market research
- Content strategy and creation
- Digital PR campaigns
- Performance analytics
- Cross-border SEO
- Market expansion planning
Industry Focus:
- E-commerce platforms
- Global retail brands
- Fashion and apparel
- Sports and fitness
- Luxury retail
- Direct-to-consumer brands
Blue Array: SEO and digital PR pioneers since 2015
Operating from Reading and London, Blue Array revolutionized the agency model with their trademarked “consulgency®” approach. Founder Simon Schnieders leveraged his decade of experience leading SEO at major brands like Zoopla, Yell, and Mail Online to create an agency that bridges the gap between consultancy expertise and hands-on execution.
Their approach stands out through three core differentiators:
- Deep technical expertise from their specialized in-house team
- Custom tools and methodologies developed from enterprise-level experience
- Focus on measurable growth metrics rather than vanity KPIs
Languages & Markets:
- Strong UK market presence
- International strategy development
- Cross-border campaign management
- Market-specific optimization
Notable Results: Portfolio showcasing diverse sector success:
- Help for Heroes: Nonprofit sector optimization
- UNiDAYS: Student market penetration
- Rothschild & Co: Financial sector dominance
- MailOnline: News sector optimization
- GoHenry: Fintech market growth
- RAC: Automotive sector leadership
- Yell: Local business directory enhancement
- So Energy: Energy sector expansion
Core Services:
- Organic search strategy development
- Advanced technical SEO implementation
- Digital PR campaign execution
- Content strategy and creation
- Conversion rate optimization
- Analytics and reporting
- Site migration expertise
- International SEO planning
Industry Focus:
- Automotive and transport
- Financial services and fintech
- E-commerce platforms
- Energy sector
- Nonprofit organizations
- Retail brands
- Technology companies
- Enterprise solutions
What makes a great international SEO agency?
Navigating global markets isn’t just about translating your keywords and calling it a day. Technical skills matter, but they’re only part of the picture. Here’s what actually drives results in international SEO.
đź’ˇ Having trouble knowing how to pick the right agency?
We whipped up a guide on how to find and vet the right SEO agency
Download the guide
1. Technical excellence is non-negotiable
Let’s start with the boring but essential stuff: technical SEO. If your agency doesn’t nail the basics, like hreflang implementation, site structure optimization, and server location strategy, you’re already on the back foot. People don’t give technical SEO enough credit – it does affect the impact of all the other work.
- Hreflang done right: Ensuring Google knows exactly which version of your content serves each market.
- Market-specific site structure: Organizing your website in a way that users (and search engines) can navigate seamlessly, no matter the language.
- Localized mobile optimization: Because a clunky mobile experience in Paris won’t fly in Tokyo either.
2. They don’t just translate, they localize AND do SEO
This is the difference between mediocre and world-class agencies. A good international SEO agency knows that translating keywords won’t cut it. They’ll conduct local keyword research, adapting strategies to how people actually search in each market.
Think about it: French users might Google “acheter en ligne” (buy online), while Germans might search for “online kaufen.” If your SEO agency doesn’t understand cultural nuances and search intent differences, they’re wasting your budget.
3. A proven track record of market-specific results
Here’s the thing: pretty graphs and reports don’t mean much unless they’re backed by meaningful results. A great agency will have case studies that show tangible wins, like:
- Revenue growth in specific markets
- Improved market-specific conversion rates
- Increases in organic traffic that actually drives business outcomes
Look for agencies that can prove their work with industries or target markets similar to yours.
4. They’re fluent in more than just languages
A great agency isn’t just multilingual; they’re culturally fluent. They understand how buying behaviors differ across markets and adapt their content strategies, messaging, and even visuals accordingly.
For example:
- Content that resonates in Spain might need a conversational tone and focus on storytelling.
- Meanwhile, German audiences might respond better to detailed, straightforward information with more technical precision.
5. They bring tools and processes that scale
Global markets mean global complexities, so the right agency will have a scalable process for managing campaigns across multiple regions. Look for tools like:
- Rank tracking by market (because rankings in Tokyo don’t matter in Toronto)
- International backlink analysis tools to track and measure regional authority
- Cultural adaptation frameworks to ensure campaigns resonate everywhere
Their process should feel like a well-oiled machine, not like they’re figuring it out as they go.
6. They prioritize collaboration
Finally, the best agencies aren’t vendors—they’re partners. They’ll take the time to understand your business objectives, build strategies that align with them, and actively involve you in the process. This includes:
- Transparent communication about what’s working and what isn’t
- Regular check-ins with actionable updates
- The ability to pivot strategies based on market performance
Finding the best international SEO agency to grow your global presence
Expanding into international markets can feel like a daunting task, but partnering with the right international SEO agency can make all the difference. These agencies won’t just translate your content. They’ll help you build strategies tailored to each market, ensuring that your brand resonates with audiences worldwide.
Whether you’re looking to enter European markets with multilingual campaigns or need a partner who can align SEO with your business objectives, the agencies on this list bring the expertise and tools to deliver results.
Here’s a quick recap of what to look for:
- Agencies with strong technical foundations, from hreflang to international site architecture.
- Native language experts who understand cultural nuances and local search intent.
- Proven track records with case studies that show real business impact.
- Scalable tools and processes to manage campaigns across regions.
Your global success depends on working with a partner who understands that no two markets are the same. The agencies featured here stand out for their ability to navigate those complexities while delivering measurable growth.
Capture new markets with international SEO
Find out how our multilingual, multi-region team can help you drive international traffic and conversions.
Get a marketing consultation
Frequently asked questions (FAQs) about international SEO agencies
What is international SEO?
International SEO is the process of optimizing your website so it can rank and perform well in search engines across multiple countries and languages. Unlike standard SEO, it involves strategies like implementing hreflang tags, adapting content for cultural nuances, and conducting region-specific keyword research. The goal is to ensure that users in different locations see the most relevant version of your site tailored to their language, preferences, and search behavior.
How much do international SEO services cost
The cost of international SEO services varies widely depending on the agency and the scope of work. For basic multilingual SEO audits and strategy, you could be looking at a few thousand dollars per month. For comprehensive services—including content creation, technical SEO, and ongoing optimization for multiple regions—it can range from $5,000 to $20,000+ monthly. Keep in mind that high-quality international SEO often requires native-language expertise, which can increase costs but delivers better results.
How long does international SEO take to show results
International SEO isn’t an overnight solution. Depending on the complexity of your markets and website, it can take anywhere from 3 to 6 months to start seeing initial results. For more competitive industries or larger international campaigns, it might take closer to a year to achieve significant organic growth. Results depend on factors like existing site authority, competition, and the level of localization your strategy includes.
What’s the difference between international and local SEO
Local SEO focuses on optimizing a website for visibility in specific cities or regions, often targeting location-based searches like “SEO agency in London.” International SEO, on the other hand, scales this concept globally, optimizing for multiple countries and languages. While local SEO relies heavily on tactics like Google Business Profiles and local citations, international SEO emphasizes multilingual content, hreflang tags, and tailoring strategies for different cultural and regional nuances.
Do I need separate strategies for different markets
Absolutely. Search behavior, language, and cultural preferences vary from one market to another. A one-size-fits-all SEO approach won’t work when expanding globally. For example, a strategy that works in the UK may fail in Japan without adjusting for local search intent, keyword trends, and cultural relevance. Separate strategies ensure that each market feels like the content is created specifically for them, which improves engagement and conversion rates.