7 Best SEO Agencies In The UK (2025)

Securing the best SEO agency for your brand is a tricky task. As digital competition rises to an all-time high, more businesses than ever before are battling it out for the top position in the SERPs.

Those without a strong SEO strategy are likely to get lost in the noise, missing out on valuable leads and site traffic.

In order to stay ahead in today’s online marketplace, prioritising SEO is essential. From content optimisation to keyword research and link building, every aspect of search engine optimisation improves your visibility as a business online.

However, mastering SEO takes time, expertise, and constant adaptation to algorithm changes—something most brands struggle to juggle.

That’s where outsourcing your SEO efforts comes in handy. Partnering with the best SEO agency you can find will ensure that your website grows exponentially in a busy search landscape. SEO experts provide guidance, practice cutting-edge strategies and deliver measurable results, freeing up your team to focus on other marketing tasks.

With more than 178,00,000 results on Google for the term ‘best SEO agencies in the UK’, choosing the right solution for your business can feel overwhelming.

With this in mind, we’ve done the hard work for you. In this guide, we’ve handpicked the best SEO agencies the UK has to offer based on expertise, industry case studies, and a powerful track record. Let’s dive in!

What Do The Best SEO Agencies Have In Common?

The best SEO agencies are in high demand for a reason. With key qualities setting them apart from other industry contenders, they guarantee long-term success for their clients.

One easy way to spot a stellar SEO agency is to take a look at their previous client case studies. Are they constantly working with big brands? Do they retain their clients for multiple campaigns? What were their deliverables?

When searching for the best SEO agencies for your business, here’s what you should expect from a key contender:

• Proven Client Retention: Client retention is one of the strongest indicators of a successful SEO agency. High-performing agencies consistently deliver results for their clients, encouraging brands to sign up for long-term contracts for continued growth. Client longevity suggests that an SEO agency is highly adaptable to changing search trends, easy to communicate with and proactive in its approach to search engine optimisation. In order to confirm client retention, take a closer look at an agency’s published case studies and brand directory. If multiple clients are engaged in long-term partnerships with the agency, they are more likely to be satisfied with their quality of work.
• Depth of Expertise: SEO is a multi-faceted industry. The best SEO agencies will always offer multiple services, including content optimisation, link building, guest posting, technical SEO and even digital PR. For the best results, choose an agency that hires specialists in each of these areas rather than relying on a one-size-fits-all strategy. A strong SEO team will have dedicated experts who deal with on-page and off-page SEO, as well as in-house content optimisation that ensures your website remains competitive.
• Transparent Communication: Partnering with an SEO team is a long-term commitment for most brands. In order for the brand-agency relationship to truly thrive, strong communication is crucial. The best SEO agencies act as an extension of your in-house team, delivering regular updates and transparent adjustments that are crafted around your specific brand goals. Look for an agency that prioritises collaboration, offers transparent reporting and aligns with your brand’s core values.
• Strong Industry Knowledge: The best SEO agencies are able to adapt to your industry’s unique challenges. Whether you’re in finance, e-commerce, SaaS or healthcare, the strongest SEO teams can tailor their strategies to align with your industry trends and demographic behaviour. A great way to get an insight into an agency’s adaptability is to take a look at their client history. Have they worked with brands from multiple industries, or do they specialise in a specific field?

If you focus on these qualities, you can confidently select the best SEO agency to drive growth and visibility for your brand.

Ranking The 7 Best SEO Agencies In The UK

If you’re struggling to choose the best SEO agency for your brand, we have you covered.

We’ve put together a list of seven leading SEO agencies in the UK with a powerful client portfolio.

#1 | Best All Round SEO Agency: Solvid

Since its founding in 2015, Solvid has established itself as one of the best SEO agencies in the UK.

Based in the heart of London, this creative SEO agency specialises in all forms of on-page and off-page SEO, including copywriting, guest posting, link building and digital PR services.

Unlike other agencies in the industry, the Solvid team tailors their approach to each individual client, personalising their list of strategies to meet a business’ specific set of goals.

What Solvid Offers:

• Fully Managed SEO Services: For brands looking to enhance their visibility from all angles, Solvid conducts fully managed SEO campaigns that are designed to boost search rankings, increase organic search traffic and improve content visibility.
• Copywriting & Content Marketing: A successful SEO strategy often revolves around creating high-quality, engaging content. Solvid’s team of expert writers can improve your web content by crafting blog posts, optimising landing pages, and enhancing product descriptions. Between selecting the right keywords for a successful search, conducting on-page SEO audits, and researching your market audience, the Solvid team create content that not only attracts visitors but also converts them into customers.
• Guest Posting & Link Building: The Solvid team are link-building specialists. Backlinks remain one of the most essential ranking factors in SEO. Solvid takes a manual approach to blogger outreach and guest posting to secure clients’ high-authority backlinks from reputable publications without sacrificing personalisation.
• Digital PR: Solvid also specialises in digital PR services. Leveraging a number of strategies, such as newsjacking media outreach and platforms like Connectively (formally HARO), they secure regular brand coverage in exceptional publications that aim to increase visibility for their clients.
• SEO Audits & Technical SEO: Solvid is a data-driven agency. Before crafting expert growth campaigns, they conduct in-depth SEO audits to uncover any hidden issues affecting website performance. From poor site speed to crawling errors, this agency ensures that no technical aspect of SEO is left untouched.

As a proud partner of SEMRush, Clutch, and Digital Agency Network, this agency has built a strong reputation for delivering outstanding SEO services across the board.

From SaaS startups to S&P 500 companies, Solvid has worked with some of the most exciting brands across the globe to create meaningful, data-driven SEO results.

Proven Success: Freedom24 Case Study

While they worked with many clients over the years, one of Solvid’s most impressive success stories is their partnership with Freedom24.

This Nasdaq-listed online broker tasked the team to generate media publicity for the brand and drive organic traffic across nine international markets, including the US, UK, and Germany.

Combining a number of SEO strategies, including comprehensive content marketing, targeted outreach, and digital PR, Solvid secured a range of high-authority links and media placements for Freedom in an attempt to raise organic traffic and brand visibility.

Here are the results:

✅ 391% increase in organic traffic year on year
✅ High-profile placements in Forbes, Business Insider, Nasdaq, Yahoo Finance, and more
✅ Stronger brand recognition and credibility in multiple European markets

As an SEO agency that combines strategic outreach with exceptional content optimisation, Solvid continues to deliver great results for a diverse range of clients. As one of the best SEO agencies in the UK, Solvid is a name you can trust.

#2 | Best International SEO Agency: Impression

Next up on the list of the best SEO agencies in the UK is Impression. Founded in Nottinghamshire in 2012, Impression has established itself as one of the UK’s expert agencies for international SEO.

Since expanding its office space to London, the agency has continued to help brands expand their global reach by implementing a number of tailored SEO strategies such as website optimisation, technical SEO and building international backlinks.

What Impression Offers:

• International SEO: Impression specialises in increasing brand visibility in multiple markets. Working closely with businesses to create an international expansion strategy, they optimise all aspects of their campaign to serve audiences in a number of target locations.
• Website Domain Restructuring: Domain restructuring plays a key role in enhancing site visibility across different regions. Impression helps brands adopt the right approach and optimises URL structures for target countries.
• International Page Optimisation: Impression’s team of content experts also ensure that all content appeals to multiple sets of target audiences by optimising imagery and language to appeal to country-specific searches.
• International Link Building: Impression is also an expert at securing high-quality region-specific backlinks. With a range of impressive off-page SEO campaign case studies under their belt, they are well-equipped to boost your domain authority worldwide.

Proven Success: Clarins Case Study

A standout case study from Impression comes from their work with the international beauty brand Clarins.

After approaching the SEO agency in late 2020, Clarins tasked Impression with the challenge of improving its organic visibility in multiple markets and optimising key category pages to boost search rankings.

Using a method compiled of strategic on-page optimisations, technical SEO improvements, and international link-building efforts, here are the results Impression were able to deliver:

✅ +6.24% increase in traffic
✅ 8.4% growth in organic visibility

For those of you looking to enhance your international reach, Impression continues to deliver powerful results for their clients.

#3 | Best SEO Agency For Ecommerce: Novos

Based in London, NOVOS has established itself as one of the UK’s go-to agencies for e-commerce brands aiming to dominate organic search.

With a data-driven approach, NOVOS’ team of 40+ experts have helped more than 200 e-commerce brands boost their organic revenue and say goodbye to paid media. Using a combination of technical SEO, digital PR and content strategy, this award-winning SEO agency is one of the best to employ if you’re looking to take your online store to the next level.

What NOVOS Offers:

• Technical SEO: NOVOS relies on running in-depth technical audits on on-site performance, search visibility, and speed to enhance its approach to SEO solutions.
• Brand Growth through Digital PR: NOVOS’ team of experts also create brand-driven PR strategies to improve awareness on a number of platforms. Brands can expect to secure coverage in niche publications as well as high-DR websites that are frequently engaged with by their target audience.
• Content Marketing: This SEO agency also assists brands during the creative process of content creation. From in-depth keyword research to mapping live competitor content for profitable gaps, NOVOS takes a data-driven approach to content marketing. Better still, NOVOS’ highly adaptable team of content strategists create high-impact content for brands of all different niches that improve rankings and engage customers.

Proven Success: Bloom & Wild Case Study

NOVOS has partnered with a number of leading UK e-commerce brands, such as Osprey, Swyft and Made.com; however, one of their most notable campaigns comes from their partnership with Bloom and Wild.

In 2020, the UK-based flower delivery company partnered with NOVOS to create a campaign around the term ‘thoughtfulness’ during the pandemic. The challenge for this best SEO agency was to drive organic visibility, secure media coverage and reinforce Bloom and Wild’s message.

Their strategy involved pitching the press to spark media interest and running a unique campaign which highlighted the UK’s most thoughtful regions.

Here are the results:

✅ 20+ UK backlinks from high-authority sites
✅ 10+ international media placements
✅ Ongoing media coverage nearly a year after launch

If you’re an e-commerce brand searching for the best SEO agency to improve your store visibility, look no further than NOVOS.

#4 | Best SEO Agency For PPC: The SEO Works

With offices spanning over three UK locations, The SEO Works is one of the biggest digital agencies on this list.

As an award-winning SEO company, The SEO Works are a safe bet for brands looking to increase their visibility, generate more leads and grow their revenue.

In addition to covering basic services, The SEO Works is also one of the best SEO agencies for PPC. The team provides a list of comprehensive pay-per-click services that aim to maximise your brand’s advertising ROI and enhance your ad visibility across the web.

What The SEO Works Offers:

• Fully Managed PPC Campaigns: The SEO Works offers a wide range of strategic pay-per-click advertising campaigns for brands looking to improve their customer acquisition. Using a combination of Google AdWords, ad extensions and multi-device ad optimisation, this SEO agency simplifies the advertising process and promises guaranteed returns.
• Local SEO: The SEO Works also helps businesses improve their organic search visibility, especially if you’re operating in a specific location. As an agency that prioritises local search ranking factors, their dedicated team will help you drive qualified traffic to your website.
• Website Design & Development: The SEO Works houses a team full of web design specialists alongside their dedicated SEO team. If you’re looking to invest in the full works for your brand’s online presence, TSW’s group of design experts will optimise your website performance to increase engagement and conversions.

With over 15 years of experience under their belt and a team of 50-200 experts, The SEO Works has partnered with a wide range of leading brands to generate long-term growth and a higher return on investment.

Proven Success: EZ Living Furniture Case Study

One of TSW’s best success stories comes from its collaboration with the retail brand EZ Living Furniture.

Met with challenges such as a struggle for the brand to compete with high-value, unbranded search terms, The SEO Works implemented a solution consisting of a multi-channel SEO and PPC campaign and a full-scale rewrite of key product pages.

The results were successful:

✅ +204% increase in transactions
✅ +99% growth in revenue
✅ 10:1 return on ad spend

The SEO Works confidently delivered a campaign that boosted revenue and brand reach. For brands looking for an agency that delivers customised, data-driven SEO, TSW is a strong contender for the list.

#5 | Best Small SEO Agency: Fly High Media

Next up, we’re celebrating Fly High Media. As a small SEO agency based in Cheshire, Fly High has generated impressive results for a number of brands thanks to its small team of dedicated experts.

Fly High’s focus on search engine optimisation, social media advertising and digital PR has won them a spot on this list, especially after delivering a 45% increase in organic search revenue for BuyCleverStuff and a 28% jump in organic traffic for Office 5 Star.

What Fly High Media Offers:

Fly High Media approaches SEO in five steps, offering its clients a fully managed service for maximum search ranking potential.

• Defining SEO Goals: Fly High is dedicated to getting to know its brand partnerships on a personal level. Fly High’s highly engaged team spend time with their clients, understanding their individual business needs and objectives. These can then be turned into targeted SEO strategies that drive measurable outcomes.
• SEO Audits: The next stage of the Fly High five-step plan is to perform an in-depth web audit to identify and fix any technical SEO issues.
• Keyword Research: Once an audit has been taken of a client’s current website performance, Fly High begin hunting for high-intent search terms that aim to target the right leads for an improved organic search result.
• Site Optimisation: Once keywords have been identified, Fly High begin the optimisation stage, which consists of redesigning the client’s website structure, rewriting content and optimising on-page elements to improve ranking potential.
• Measuring Success: The final stage of Fly High’s five-step plan is to monitor campaign performance. Promising brands regular updates, this best SEO agency is a master of adapting and refining its strategy throughout the campaign to ensure clients receive the best results.

Proven Success: Alps Luxury Chalets Case Study

Fly High Media combine SEO and strategic digital marketing to help their clients scale their online presence.

Take the case study of Alps Luxury Chalets, for example. This provider of high-end ski resort accommodation approached Fly High with the challenge of driving Christmas bookings in 2019.

This best SEO agency developed a highly targeted strategy that partnered SEO with social media advertising to increase engagement for the client and drive conversions.

The results were impressive:

✅ 93.99% increase in click-through rate (CTR)
✅ 100+ high-quality leads generated

Taking a data-driven approach to client SEO, Fly High continuously delivers tangible business results for the brands they partner with at a fraction of the cost charged by larger SEO agencies.

#6 | Best SEO Agency For Technical SEO: Pearl Lemon

Pearl Lemon is a leading technical SEO agency specialising in technical optimisation, local SEO strategies and enhancing website performance for clients of all shapes and sizes.

In such a highly competitive search landscape, Pearl Lemon’s widespread UK team tackle E-E-A-T and Google algorithm recovery, crawling optimation, and more to help clients improve their search engine visibility.

What Pearl Lemon Offers:

• Website Optimisation: Pearl Lemon’s technical approach to SEO ensures that a client’s site content is effectively crawled and indexed by search bots for enhanced ranking capabilities.
• E-E-A-T Recovery: E-E-A-T, also known as Experience, Expertise, Authoritativeness, and Trustworthiness, is a popular framework that Google uses to determine the quality of content on websites. Pearl Lemon conduct client campaigns with E-E-A-T at heart to help businesses recover from ranking dips caused by any search engine updates.
• Enhancing Core Web Vitals: Pearl Lemon’s highly experienced team of data-driven professionals is dedicated to improving its clients’ core web vitals, including site speed, UX design, and strategic content optimisation.

Pearl Lemon certainly has a strong reputation as one of the best SEO agencies in the industry, with recognition from Clutch, Design Rush, and Agency Spotter as one of the leading agencies to choose from in the UK.

Proven Success: Senior Guidance Case Study

Conducting a strategy with technical SEO at heart, Pearl Lemon helped their client, Senior Guidance (a senior living resource website), improve their SERP score on the back of a large Google Medic Update.

After experiencing a 40% drop in organic traffic, Pearl Lemon’s data-driven team tackled recovery using E-E-A-T optimisation and a series of technical site fixes.

Here are the results:

✅Improved rankings for high-value search terms
✅Traffic recovery within just a few weeks

Pearl Lemon’s technical approach to SEO drives its success as one of the top-performing SEO agencies in the UK.

#7 | The Best SEO Agency For B2B Clients: Definition

Last but not least, let’s reveal the best SEO agency for B2B clients. Definition is a multi-award-winning SEO agency with a deep-rooted background in content marketing, PR and B2B strategy.

Definition is an agency that is devoted to helping B2B brands reach their full potential in an online search landscape. With a team made up of former journalists, SEO experts, and PR professionals, Definition’s highly experienced team is focused on generating high-quality leads and aiding brands in establishing long-term market authority as thought leaders.

What Definition Offers:

• PR-Led Link Building: Definition helps B2B brands gain traction online by engaging in partnerships with other leading domains in a client’s industry niche. A highly qualified team of PR specialists work hard to secure powerful backlinks for a brand in a number of top-tier publications and domains.
• SEO & Keyword Research: For many B2B brands, establishing topical authority is crucial in the fight for visibility. Definition targets high-intent B2B search terms to help attract more traffic to their client’s thought leadership content.
• Lead Generation: Definition engages in a number of lead generation strategies to ensure that businesses secure as many conversions as possible. These include crafting engaging content, improving brand recognition and boosting engagement on numerous brand platforms.

Proven Success: Checkout.com Case Study

A great case study that showcases Definition’s true talent is the agency’s partnership with Checkout.com.

This fast-growing online payments company presented to Definition with a struggle to increase visibility and establish authority amongst other industry players.

In response, Definition embarked on a strategy packed full of B2B PR and thought leadership, content optimisation and executive branding techniques to help the company appeal to the media and industry leaders.

The results delivered were game-changing for Checkout.com:

✅ 1,405 brand mentions in top publications
✅ 128 media hits, including national coverage
✅ 55 sales-qualified leads
✅ 255% increase in branded searches
✅ 176% increase in site traffic

Definition successfully improved Checkout.com’s position as a major industry player. They have also generated similar results for a number of B2B businesses, proving why they are one of the best SEO agencies in the UK.

Wrapping Up

Choosing the best SEO agency for your business can be a difficult task. If you’re unsure where to start, take a closer look at some of the brilliant agencies we’ve mentioned in this article.

Optimising your brand site and content for increased search visibility is the key to driving leads in a competitive search landscape. Partnering with an SEO agency is an easy way to ensure that your target audience discovers your brand first. However, it’s up to you to make sure they stick around.