Top 12 SEO Agencies in London for 2025

The best-performing London SEO agencies understand the organic ranking algorithm and suggest changes to rank your website on top of Google search engine results pages.

As a business owner, you should partner with the leading SEO companies in London to create KPI-oriented organic search optimization processes to power your rankings. 

You should select the right London SEO companies to promote and grow your business online. We’ve compiled a list of the best companies you can trust with your promotion. We’ll also look at how to make a smart choice.

You might be interested: SEO events in London and beyond

List of the Best SEO Companies in London

Here are the leading London SEO agencies:

1. Ninja Promo

We are one of the best SEO services in London, wielding unparalleled expertise to unlock the full potential of organic search. 

As experienced SEO professionals, we redefine the landscape by constantly pushing the boundaries of organic marketing innovation. 

Our commitment to excellence is not just a claim – it’s a proven track record of propelling clients to the top of organic search engine rankings.

Being rated as one of the top international SEO services, we have clients worldwide. Some of the top clients we have worked with are Atom Bank, Rebus Chain, Cybarco, Recycleye, Tripment, Xentrics, and many others.

🔗Website: Ninjapromo.io

⏳Founded: 2017

🌎Location: 71-75, Shelton Street, Covent Garden, London, WC2H 9JQ | +44 20 3868 4672

🧑‍💻Number of Employees: 101-200

⚙️Key Services:

• Keyword Research
• Competitor Analysis
• On-Page SEO
• Off-Page SEO
• Content Audit
• Technical Audit
• High-Quality Backlink Building
• Reporting and Analytics
• PPC
• Marketing Strategy
• PR

🔝Best for:

• For SEO promotion of any company, from large existing websites to new small business websites.

✅Why Choose Us:

• Our team is constantly learning and staying up to date with the latest SEO practices. We use the most advanced tools to ensure our strategies remain effective and forward-thinking.
• In addition to SEO, we offer a wide range of marketing services. You can choose individual solutions or take advantage of our cost-effective subscription model for ongoing support and better value.

Case Studies: View all case studies

2. Thrive

Thrive Internet Marketing Agency is one of the top SEO services in London, specializing in creating bespoke SEO strategies to drive growth and enhance the bottom line for businesses. 

With a focus on implementing growth-oriented campaigns, Thrive offers a range of services, including organic marketing, conversion rate optimization, content creation, ADA compliance, and link building. 

🔗Website: Thriveagency.com

⏳Founded: 2005

🌎Location: 4600 Park Springs Blvd, Ste 100, Arlington, TX 76017 | (877) 959-9892

🧑‍💻Number of Employees: 51-200

⚙️Key Services:

• Keyword Research and Strategy
• On-Page Optimization
• Off-Page Optimization
• Content Writing
• HARO Link Building
• Technical Website Audits
• Google Analytics Tracking

🔝Best for:

• Businesses in the ecommerce, healthcare, finance, technology, or any other sector, Thrive employs tailored strategies to meet the unique needs of each industry. 

✅Why Choose Them:

• Their SEO strategy includes optimizing website structures, enhancing site speed, improving mobile responsiveness, and implementing schema markup for better search engine visibility.
• Their SEO company based in London leverages technical insights to enhance Conversion Rate Optimization (CRO). Through A/B testing, heat mapping, and user behavior analysis, they optimize website elements to improve conversion rates and overall performance.

📁Case Studies: View all case studies 

3. Bird

Bird Marketing is a popular SEO agency in London offering businesses cutting-edge tools and technology to provide efficient and tailored SEO strategies. They focus on decoding business and user flow for personalized strategies in London’s dynamic market. 

🔗Website: Bird.co.uk

⏳Founded: 2010

🌎Location: 13 Austin Friars, London, EC2N 2HE | +44 208 338 1206

🧑‍💻Number of Employees: 11-50

⚙️Key Services:

• Technical Optimization
• Keyword Research
• Local Optimization
• Ecommerce Optimization
• Digital PR
• On-Page SEO
• Off-Page SEO
• Analytics Tracking

🔝Best for:

• They are best for financial services, manufacturing, retail, healthcare, and seeking comprehensive organic marketing services. 

✅Why Choose Them:

• Bird Marketing has received prestigious awards, including the Clutch Top Digital Agency Award, Good Firms Top Digital Agencies Award, Manifest Top Digital Agencies Award, and Design Rush Best B2B Digital Marketing Agency Award.
• The agency’s streamlined process covers technical optimization, on-page optimization, off-page optimization, local optimization, and data-driven analytics, ensuring a strategic and measurable approach.

📁Case Studies: View all case studies 

4. Pearl Lemon

Pearl Lemon is one of the best SEO services in London, having a team of award-winning SEO specialists. By focusing on higher SEO rankings, increased traffic, and improved conversions, Pearl Lemon provides a full-service search engine optimization experience.

🔗Website: Pearllemon.com

⏳Founded: 2016

🌎Location: Kemp House, 152 – 160 City Road, London, EC1V 2NX | +442071833436

🧑‍💻Number of Employees: 51-200

⚙️Key Services:

• On-Page SEO
• Off-Page SEO
• Technical Audit
• App Optimization
• Strategy & Consulting
• Analytics & Reporting

🔝Best for:

• Businesses that value transparency and regular updates on their SEO campaigns. Pearl Lemon’s commitment to providing detailed reports every two weeks, live daily reporting, and direct email access to the link building portal ensures a clear view of progress.

✅Why Choose Them:

• The agency goes beyond standard reporting, offering an activity reporting dashboard, 30+ link-building guides, and <12-hour email support.
• Their SEO company showcases its experience ranking websites in various languages, including Russian, Spanish, Portuguese, and Italian.

📁Case Studies: View all case studies 

5. Found

Found is one of the best SEO services in London, offering a comprehensive suite of services, including organic marketing, PPC, Social, and Digital PR. Their success is rooted in a unique blend of data-driven strategies and SEO expertise, consistently delivering exceptional results for B2B and B2C clients worldwide. 

🔗Website: Found.co.uk

⏳Founded: 2005

🌎Location: Johnson Building, 77 Hatton Garden, London, EC1N 8JS

🧑‍💻Number of Employees: 51-200

⚙️Key Services:

• Technical Audits
• Ecommerce Audits
• Website Migration
• International Optimization
• Content Marketing
• Digital PR
• Conversion Rate Optimization

🔝Best for:

• This London-based digital marketing and SEO company best suits startups seeking accelerated online growth and visibility. 

✅Why Choose Them:

• With a proven track record, including over 20 industry awards and recognition as an elite agency, they excel in delivering results through a strategic blend of data-driven approaches and human expertise.
• With a focus on eliminating obstacles in crawling, indexing, and ranking processes, they prevent poor technical health from hindering your website’s performance. 

📁Case Studies: View all case studies 

6. The Munro Agency

The Munro Agency is an SEO agency in London that handles everything from SEO copywriting to technical optimization. Their strategies focus on a creative approach and a smart mix of methods. Alongside SEO, you can also add services like PR, PPC, website development, and more.

🔗Website: Munro.agency

⏳Founded: 2015

🌎Location: Wymering Road, London, W9 2NG | +44 0207 8719 994

🧑‍💻Number of Employees: 11-50

⚙️Key Services:

• SEO
• PR
• Paid Media
• Lead Generation
• Content Writing
• Website Development 
• Website Design

🔝Best for:

• The Munro Agency partners with both global corporations and local SMEs, delivering custom marketing solutions.

✅Why Choose Them:

• They maximize automation in their marketing processes while combining it with real, hands-on experience in driving client success.
• The agency offers dedicated services for B2B. Its specialists analyze the market and develop tailored strategies to generate leads through various methods.

📁Case Studies: View all case studies

7. ClickSlice

ClickSlice is a bespoke SEO agency based in London that helps your brand place your website in front of your target audience. 

Their London SEO agency has a team of passionate SEO experts committed to transparency, accountability, and results-driven marketing. 

🔗Website: Clickslice.co.uk

⏳Founded: 2016

🌎Location: Studio 10 Shoreditch Stables 138 Kingsland Rd Hoxton, London, E2 8DY | 020 3287 3638

🧑‍💻Number of Employees: 11-50

⚙️Key Services:

• Ecommerce Optimization
• Competitor Analysis
• User Experience Analysis
• Technical Audit
• Backlink Building
• Website Speed Optimization
• Content Optimization
• Monthly Progress Reports

🔝Best for:

• Small and medium-sized businesses looking to acquire first-page rankings on Google. 

✅Why Choose Them:

• The agency’s unique SEO process has consistently delivered a 10x ROI for businesses.
• They stand out by offering contract-free campaigns. Clients are not tied into long-term agreements, emphasizing the agency’s confidence in delivering value. 

📁Case Studies: View all case studies 

8. ClickDo

ClickDo is one of the top SEO agencies in London offering bespoke optimization services. Their success in optimizing for Google’s algorithm lies in its focus on storytelling through high-quality content, citations, blogs, and media, building brand consistency and high authority.

With a dedicated global team, ClickDo ensures every project is intelligently planned to achieve high rankings on a reasonable timescale, keeping up with competitors.

🔗Website: Clickdo.co.uk

⏳Founded: 2013

🌎Location: Suite 78 Unit 3a, 34-35 Hatton Garden, Holborn, London, EC1N 8DX

🧑‍💻Number of Employees: 11-50

⚙️Key Services:

• SEO Consulting
• Link Building
• Keyword Research
• Content Marketing
• On-Page Optimization
• Technical Audits
• Analytics & Reporting 

🔝Best for:

• They are great for local businesses, such as restaurants, salons, medical practices, and retail stores, optimizing their online presence to attract local customers.

✅Why Choose Them:

• Led by CEO Fernando Raymond, they are committed to delivering futurist online marketing solutions, ensuring your business succeeds today and thrives in the future.
• They analyze and discuss your advertising options, providing affordable yet highly effective solutions tailored to your needs. 

📁Case Studies: View all case studies 

9. Creative Ideaz

Creative Ideaz is one of the top SEO companies in London, boasting over 15 years of experience and a track record of ranking over 200,000 keywords for more than 120 SEO clients. 

The agency takes pride in supporting local businesses, collaborating with over 100 companies in London and beyond, and achieving exceptional results, such as over 100,000 keyword rankings. 

🔗Website: Creativeideaz.co.uk

⏳Founded: 2007

🌎Location: Spacemade – 10 Brindley Place, Birmingham, B1 2JB | 0121 285 0714

🧑‍💻Number of Employees: 11-50

⚙️Key Services:

• Organic Marketing
• Keyword Research
• Competitor Analysis
• Local Optimization
• International Optimization
• Conversion Rate Optimization

🔝Best for: 

• Businesses looking to achieve first-page rankings, dominate their keywords, and scale their business.

✅Why Choose Them:

• The agency’s proven four-step process, including an initial conversation, website on-page optimization, reference building, and continuous monitoring, ensures a systematic and effective approach to boosting your website’s visibility.
• Their team of London SEO experts offers a free website audit to identify any issues hindering your rankings and provide actionable insights for improvement. 

📁Case Studies: View all case studies 

10. Ignite SEO

Ignite SEO is a young SEO company based in London that has quickly made a name for itself with over five years of experience in website optimization. They’ve worked with a wide range of clients, from local businesses to large international brands.

Ignite SEO team follows a structured framework while constantly evolving its methods through ongoing learning and innovation. They’ve helped numerous businesses reach the first page of Google through targeted SEO strategies.

🔗Website: Igniteseo.co.uk

⏳Founded: 2020

🌎Location: 49 Stewart’s Grove, London, SW3 6PH | 020 3150 0995

🧑‍💻Number of Employees: 11-50

⚙️Key Services:

• Local SEO
• Ecommerce SEO
• SEO Audit
• SEO Consultancy
• Link Building

🔝Best for:

• As an agency specializing in SEO, they cater to businesses of all types, even those in highly competitive industries such as legal and healthcare.

✅Why Choose Them:

• Recognized by leading industry platforms, Ignite SEO has earned top ratings and awards for its consistent performance and client satisfaction.
• Their team customizes each marketing campaign to meet your unique objectives.

📁Case Studies: No case studies

11. Vertical Leap

Vertical Leap is a leading SEO agency in London with over two decades of experience. With a team of over 20 specialists, the agency provides professional SEO services, including local and international optimization, penalty recovery, and app store optimization. 

🔗Website: Vertical-leap.uk

⏳Founded: 2001

🌎Location: 80-86 Gray’s Inn Road, London, WC1X 8NH | 02392 830281

🧑‍💻Number of Employees: 51-200

⚙️Key Services:

• Amazon SEO
• App Store Optimization
• Local Optimization
• Penalty Recovery
• Technical Audits
• Website Migration 

🔝Best for:

• Vertical Leap is an ideal choice for businesses in London and beyond looking to boost their online presence and acquire more leads or sales. 

✅Why Choose Them:

• With over 20 years of experience and a team of more than 20 in-house SEO specialists, Vertical Leap is well-equipped to provide professional SEO services to businesses of all sizes. 
• As a Google Premier Partner, Microsoft partner, and Facebook marketing partner, they demonstrate high expertise and credibility in the industry. 

📁Case Studies: View all case studies 

12. SEO Works

SEO Works is an award-winning SEO company in London, earning over 14 awards for its campaigns in the last three years. 

The company’s mission revolves around helping clients gain online exposure, generate leads, and enhance customer acquisition through tailored SEO and marketing campaigns. 

🔗Website: Seoworks.co.uk

⏳Founded: 2008

🌎Location: Bellerive House, 3 Muirfield Cres, Isle of Dogs, London, E14 9SZ

🧑‍💻Number of Employees: 51-200

⚙️Key Services:

• Organic SEO
• Digital PR
• Content Marketing
• Technical SEO
• Local SEO

🔝Best for:

• The SEO Works best suits B2B, B2C, e-commerce, and healthcare industries.

✅Why Choose Them:

• The agency has a proven history of achievements, demonstrated through numerous awards and recognitions, including “Search Agency of the Year,” “Integrated Search Agency of the Year,” and many others. 
• Being a certified Google Premier Partner places The SEO Works in the top 3% of agencies. 

📁Case Studies: View all case studies 

Why You Should Hire an SEO Agency

Here are the top reasons to hire professional SEO agencies:

• Full-Funnel Marketing Strategy: Top-tier SEO agencies reach your target buyers at every marketing funnel stage. They do this by taking the help of content marketing. Undoubtedly, SEO agencies that publish buyer journey-focused content get 55% more organic traffic. 

Related content: Top Digital Marketing Agencies in London

• Customized Solutions for London Businesses: Every London business is unique, and an SEO company recognizes this diversity. By offering customized solutions, they address the specific needs and challenges businesses operating in the London market face.
• Long-Term ROI: Organic clicks account for more than 45% of all search results. An intelligently executed SEO campaign provides lasting revenue beyond improving a website’s ranking to acquiring new clients.
• Competing with London Giants: 26.9% of clicks go to the first Google mobile search results. In a city teeming with established brands, competing for top positions requires more than generic SEO strategies. The expert team of specialists from the agency knows how to get your business to the top of the search engines.
• Reduce Marketing Expenditure: Contrary to common perception, SEO is cost-effective, substantially cutting down acquisition costs. Its adaptability shines through, particularly in times of budget constraints.
• Enhanced Site Speed Optimization: Over 53% of mobile users would leave a page if it takes more than 3 seconds to load. An SEO agency is pivotal in optimizing your website’s speed. This is a key factor for user experience and a determinant in search engine rankings.
• Local SEO for Targeted Leads: Local SEO services is a good choice for businesses targeting specific geographic areas. An experienced SEO company can optimize your online presence to attract local leads. This involves optimizing Google My Business profiles, incorporating location-based keywords, and securing positive local reviews.
• Keyword Optimization for Relevance: Crafting and optimizing content with the right keywords is at the core of SEO. An agency conducts thorough keyword research to identify terms and phrases relevant to your business. By strategically placing these keywords in your website’s content, meta tags, and other crucial elements, they enhance your site’s visibility.
• Strategic Backlink Building: Backlinks, or links from other reputable websites to yours, are a significant ranking factor. Google’s page ranking algorithm considers links to be one of the top two criteria. An SEO agency employs strategic link building techniques to acquire high-quality backlinks.
• Content Quality and Relevance: Content is king in the digital landscape. Content marketing produces three 3X more leads than traditional outbound marketing. SEO agencies focus on creating high-quality, relevant content that caters to your target buyer’s needs and aligns with search engine algorithms. This involves regular updates, blog posts, and multimedia content that engage and signal to search engines that your site is a valuable resource.

What Services Do SEO Agencies Offer?

Here are the top services offered by London SEO agencies:

• Comprehensive SEO Strategies: SEO agencies in London provide end-to-end solutions, crafting comprehensive strategies that encompass on-page optimization, off-page tactics, and technical SEO. 
• Local SEO Optimization: Recognizing the importance of local visibility, London organic marketing agencies specialize in local SEO optimization. They optimize your digital assets to appear prominently in local searches, helping you effectively connect with the London audience. 
• Content Marketing Excellence: Content is a cornerstone of SEO success, and SEO agencies excel in content marketing. From creating engaging blog posts to developing informative website content, they ensure your brand communicates effectively with search engines and users. 
• Link Building Expertise: Establishing a robust online presence requires quality backlinks, and SEO agencies are adept at link building. They leverage strategic approaches to acquire high-quality backlinks, enhancing your website’s authority and credibility. 
• Technical SEO Audits: SEO agencies conduct in-depth technical SEO audits to identify and rectify website issues. From optimizing site speed to enhancing mobile responsiveness, they ensure your website aligns with search engine algorithms for optimal performance. 
• Keyword Research and Optimization: London SEO experts conduct comprehensive keyword research to find relevant terms for your business. They optimize your content around these keywords, ensuring your website ranks prominently for searches relevant to your industry. 
• Analytics and Reporting: Transparency is key, and SEO agencies provide detailed analytics and reporting. They track key performance indicators, measure campaign success, and offer insights into the impact of SEO efforts on your business goals. 

What to Look for When Choosing a London SEO Agency

To help you make a smart and informed choice, think about the following key points when evaluating potential partners:

• Understand Your SEO Needs: Consider your business goals, such as increasing conversions, building brand awareness, or gaining local visibility. Assess your current online presence and budget for comprehensive SEO services. 
• Specialized Proficiency and Experience: Opt for a firm with a demonstrated history of success and industry-relevant expertise.
• Diverse Service Portfolio: Select a company that provides a broad spectrum of services, covering on-page optimization, link building, technical SEO, and local SEO.
• Personalization and Tailored Approaches: Verify that the company formulates an individualized SEO strategy aligned with your business, target audience, and objectives.
• Transparency in Communication and Reporting: Select a company that communicates effectively, providing regular updates and transparent reporting on metrics, rankings, and insights. 
• Pricing Models and Contract Terms: Look for transparent pricing structures, flexible pricing options, and clear contract terms. 
• Client References and Case Studies: Request references and case studies to gauge the agency’s service quality and the results they’ve achieved for previous clients. 
• Contracts and Agreements: Review and understand the terms and conditions of the contract before signing, ensuring clarity on services, pricing, timelines, and other clauses. 
• Final Selection and Onboarding: Once chosen, establish a clear onboarding process, defining project scope and communication channels and providing necessary access and information. 

Increase Your Visibility with NinjaPromo SEO: Your Business at the Top

Choosing the right SEO company can have a big impact on your online success. At NinjaPromo, we don’t settle for standard SEO methods, we build real strategies that help your business grow. Our team uses solid market research, proven techniques, and clear communication. Instead of focusing only on search rankings, we work on comprehensive marketing strategies. You can order services through a convenient subscription system. For example, such as marketing strategy, SEO, PPC, PR and more.

Everything we do is based on your goals, your budget, and your industry. With NinjaPromo, you get more than just SEO services—you get a team that’s focused on helping your business succeed over time!