Best SEO Agencies 2025

Finding the best SEO agency is no easy task. According to IBISWorld , there were around 33,000 registered businesses in the UK alone as of 2024 specialising in SEO and internet marketing consultancy. And that is before we consider competitors from other corners of the world.

Finding and hiring the best SEO company from a pool of thousands is an even more gargantuan task than even before. Fortunately, this guide will help save you time, effort, and resources by outlining the top 10 SEO companies for you to choose from, what services they can offer your business, and why they are worthy to be listed among the best SEO firms for 2025.

The Top 10 Best SEO Agencies For 2025

1. Reboot Online

Top of our list is Reboot Online  – a search marketing  and SEO agency  that uses high-impact strategies to drive results and improve online visibility for clients the world over.

With decades of experience, Reboot has positioned itself as one of the best SEO companies, allowing its clients to dominate the search results via a range of bespoke, professional SEO services.

The agencies services includes:

  1. Technical SEO  - allowing them to analyse your website and determine a list of high-priority, actionable SEO recommendations that will drive growth.
  2. On-site content optimisation  - enabling the highly specialised Search team to create engaging content for your target audience that is also fully optimised to rank in the search engine result pages (SERPs).
  3. Off-site content  - offering effective digital PR  services alongside data marketing  techniques that will help you earn backlinks from high authority websites and online publications to further boost your rankings and online visibility.

Reboot has worked with some of the biggest names in the world to  help them with their SEO, including LiveFootballTickets, Viator, Indusface, and Mattress Online (to name but a few). The agency's results speak for themselves with a range of case studies  to support the success of their work.

This includes how they used FOIs to gain top-tier coverage for an AI client  and built national and regional links at scale within the travel industry .  

As an award-winning SEO agency, Reboot prides itself in always striving for innovative solutions. This has been recognised with various awards, including:

  • European Search Award winners (2024)
  • UK Company Culture Award Winners (2023 and 2024)
  • Global Content Award Winners in 2023
  • The Drum Marketing Award Winners in 2022

One thing that sets Reboot apart from many other top SEO agencies on this list is the experimental and industry-led approach they take towards SEO. Working with some of the world’s most ambitious clients means they are constantly looking for ways to push the boundaries and innovate to find the most effective SEO solutions.

Check out the range of SEO experiments  and proprietary research Reboot has led, including an SEO experiment on AI vs. human content  which looked at what type of content ranked higher in the search results. With more than 8,900 hours of research conducted and over 700 SEOs referring to their work, it’s clear to see why Reboot is considered by many as one of the top SEO agencies around.

They also provide SEO consultancy work and training for those companies who might not have the budget to spend on hiring an SEO agency right now, or those who want to still do the hands-on work themselves but just need some guidance and direction.

For more information, and to see how Reboot can help your business, contact  them to discuss your options and what might be the best SEO strategy for your company.

2. SEO Works

SEO Works  is a multi-award-winning search marketing company offering a range of SEO services across multiple sectors and industries.

With over 10 years worth of experience, SEO Works has built a reputation as a good SEO provider, having worked with many household names to boost their online performance. This includes:

  • Bill Plant Driving School
  • Decathlon
  • Just Eat
  • Roland
  • Zippo (and many more…)

They provide a range of SEO services and digital campaigns that meet the needs of target audiences, drive leads, and boost sales revenue for many clients. Have a look for yourself at the selection of case studies  on offer that document the success of their campaigns and how they have helped various brands to achieve their goals.

SEO Works has been recognised for its achievements both nationally and internationally. In 2024, they won Integrated Search Agency of the Year at the Global Agency Awards as well as SEO Agency of the Year at the Digital Excellence Awards (amongst others).

They are a certified Google Premier Partner and were recognised as a Top Performing Agency at the Google Partner Awards.

Offering a range of organic SEO, digital PR, content marketing, technical and local SEO services, SEO Works may well be an agency you speak to when looking for an SEO firm..

3. WebFX

WebFX is a digital marketing agency that aims to drive revenue growth through its search expertise, data-led decision-making, and use of innovative technologies. To date, they have generated more than $10 billion in revenue and 24 million leads for clients throughout the world via their personalised, strategic digital marketing services.

Top SEO companies will know how to get traffic flowing into your site and WebFX claims that they know how to achieve that. By offering a range of professional SEO services such as local and ecommerce SEO, alongside content marketing, they will identify your needs, put a bespoke plan in place, and aim to drive new customers to your site.

Since its inception, WebFX has won multiple awards, with 58 placed in 2024, such as:

  • Marketing Agency of the Year
  • Top SEO Company in the USA
  • Best Place to Work in PA

They were also winners of three categories at the 21st Annual Business Awards, including awards for their relationship management solution, business-to-business services, and achievements in environment, social, and governance.

Their site does highlight some good results, like a 91% retention rate and a 93% client satisfaction score (compared to industry averages of 50% and 72%, respectively).

Like many of the best search engine optimisation companies, WebFX builds custom plans for your business based on your goals, position, and industry, thus eradicating the copy-and-paste approach taken by many mediocre SEO agencies.

With flexible pricing plans, they will try to find a strategy that works for you and your budget whilst still striving to achieve your business goals, desires, and expectations.  

4. SEO Sherpa

SEO Sherpa  is a conversion-first SEO agency that specialises in helping national brands attract and convert more customers.

Using a blend of content marketing, digital PR, and technical SEO approaches, SEO Sherpa aims to deliver a complete end-to-end service that has already helped generate more than $2 billion in revenue for their clients to date.

SEO Sherpa prides themselves on providing hand-crafted, professional SEO services that aim to help your rankings grow alongside your web traffic, revenue, and ROI – helping you take your company to new heights in the world of online visibility.

From technical audits and keyword research to content creation and link building, SEO Sherpa will tailor their SEO strategy to your business needs.

Still not convinced? Then check out the range of case studies  available documenting how they have helped numerous brands boost their organic conversion rates and revenue.  

5. First Page Sage

First Page Sage markets itself as the #1 SEO agency in the U.S. and when you dig a little deeper, you can see why they make this claim.

Thought Leadership SEO is their signature SEO service, combining lead generation, industry visibility, and reputation enhancement all in one package. Within a year, they promise to craft multiple pieces of content for your company’s website, boost your rankings, and get your brand out there in front of your target audience.

Based in San Francisco Bay, First Page Sage offers a range of other professional SEO services based around consultancy, strategy, generative AI optimisation, and web design to provide a holistic SEO approach to your business goals.  

As a top SEO company, they provide a full-scale assessment of your website, identify the key areas for development, and track the success of interventions through a reporting system.

Having worked with multiple clients over the years, including Corcoran, Logitech, Alcoa, and more, First Page Sage claims to know what it takes to succeed in the world of SEO.

6. ClickSlice

Founded in 2016, ClickSlice  say that they were developed as a response to hundreds of SEO experts out there who overpromise and underdeliver. Now, they claim to be one of the best SEO agencies in London and are working to take clients from strength to strength in terms of their SEO performance.

ClickSlice also specialises in a range of professional SEO services centred around ecommerce, Shopify, Woocommerce, and Adobe, as well as SEO consultations.

Following their SEO agency process , a team of SEOs will try to ensure your business needs are understood and met each step of the way. They say that their tailored approach to SEO also means that the strategy will be bespoke to your brand’s goals and expectations. They look to throw away the cookie-cutter SEO strategy and welcome something truly unique.

Brands that have trusted CickSlice to drive their growth include:

  • Forbes
  • Udemy
  • Recipe
  • Humax
  • Comedy Carnival

The site has a range of case studies available on how they have increased organic revenue, the number of clicks, and positions on Google, which is why we featured them in this list of the best SEO agencies of 2025.

7. LocaliQ

LocaliQ  is an SEO agency with a passion for boosting your brand’s online growth. At the heart of their operations is a deep-rooted knowledge and expertise in search marketing, making them certified partners with both Google and Bing. They aim to deliver some of the best SEO services which justifies their place in this list of the top 10 SEO companies for 2025.

Using a mixture of on-page, off-page, technical, and local SEO strategies, LocaliQ aims to increase your visibility, leads, and organic conversion rate using a bespoke SEO strategy that resonates with your company, its goals, and its values.

The brand has numerous case studies  documenting their wins in the world of SEO, including how they increased the conversion rate for Pet Flaps UK by 466% and gross sales for Ultimate Gaming Paradise by almost 3,500%.

Their SEO professionals work alongside a team of web designers, videographers, PPC and paid social specialists to offer a well-rounded SEO package that fits into your overall marketing strategy, and is geared towards your individual business objectives.

8. Titan Growth

Titan Growth is a full-service, digital marketing agency comprising a knowledgeable team of dedicated professionals and technology that can significantly grow your brand, revenue, and profit.

Titan Growth claims that they are well-placed to deliver some strong SEO results.

Utilising data-driven SEO strategies, they say that they can eliminate some of the guesswork associated with your SEO plan of attack. Placed alongside their proprietary and patented TitanBOT technology, this SEO agency says they can discover valuable insights that enable a fully customised outcome for your brand.

The range of case studies available shows what their clients have to say about their work. This includes examples such as Arcadia Data, who saw a 510% increase in first page rankings in the first six months and a 23 times return on their internal goals.

Named as a Google All-Star agency and a Premier Partner further cements Titan Growth’s place on this list of the top SEO companies.

9. Gripped

Gripped is a B2B SaaS and tech SEO agency focusing on marketing tactics that drive sales and growth.

Working with a fully in-house agency team, Gripped’s work ethos centres around pace, direction, and precision. Data-driven campaigns are at the heart of what they do, allowing them to test, experiment, and measure the success of their work with ease.

A key strategy of theirs is to focus on high-intent keywords that your target audience is actively seeking as part of a buyer-centric, creative approach to SEO. They understand that B2B marketers are always under pressure to deliver results, so managing your SEO hygiene for you allows you to focus on other areas of your business.

Gripped would claim that they are well positioned to deal with your demands, whether it’s SEO audits, management, marketing strategies, or content. To them, this avoids the vanity metrics and instead focuses on growth, conversion rates, and profitable revenue.

A selection of SaaS marketing case studies highlights real and tangible results for their clients, including Nextstar who generated a £2 million return from a £20k paid budget.      

10. Devenup SEO

Devenup offers a full cycle of SEO services for your business centred around data-driven strategies and advertising campaigns. They work to help you target the areas that matter most to your company, including boosting organic traffic, conversion rates, and revenue.

With more than eight years of experience, Devenup has offered on-page and off-page SEO services across multiple platforms, including Google, Amazon, YouTube, and various social media networks.

This success is confirmed by winning various awards, such as:

  • GoodFirms ‘Top SEO Services Company’
  • ‘Best SEO Company’ for the Top 10 Find Best SEO
  • Best SEO Agencies in Alameda Award (2022)
  • 2021 Clutch Award for ‘Top SEO Companies’

With multiple international locations under its belt (Poland, Ukraine, United States, Canada, Australia, and Brazil), Devenup is a global SEO agency for you to consider.

Their core focus lies in a range of professional SEO services and devising a multi-platform SEO strategy that is bespoke to your company’s needs. With a range of experience in healthcare, fintech, ecommerce, and other niches, Devenup could help your brand become more digital, improve your web presence, and generate those all-important leads.

What Makes The Best SEO Agency?

If we’re talking about the best SEO agencies, then you’re going to expect some pretty impressive things from them to make them stand out from the crowd.

Here are some examples of things you should expect to see from a top SEO company:

Transparency

The agency should be completely honest and clear with you about all aspects of their work, such as their strategies and how they intend to meet your SEO requirements, as well as how they will monitor its success and report to you.

They should also be transparent about their pricing policy, what you will get for your money, and the impact this should have on your business after completion.

Track record

Top SEO companies should be able to prove themselves with a history of success stories. This might be demonstrated through case studies, client testimonials, or in-house SEO experiments that highlight their capabilities and the impact of the work that they have done for other clients. The best SEO agencies will have data to back this up (as opposed to just anecdotal evidence).

Experience  

It goes without saying that the best SEO providers will probably have more experience working within the industry. This goes beyond just the number of years in operation; the top SEO agencies are likely to have worked with multiple clients (and in some cases, across varying sectors to show they can achieve success in different settings and situations).

Ethics

The best SEO firms are proud to provide the most professional SEO services they can for their clients. This will incorporate tried-and-tested, credible, and ethical strategies to get results, such as white-hat SEO tactics (as opposed to black-hat ones and other questionable backlink practices).

Understanding your brand

Great SEO companies will have an inherent appreciation of your brand, what it stands for, and what your expectations are concerning your SEO goals. More importantly, the very best in the business should look to exceed them.    

Top Tips: How to Choose The Best SEO Agency

Above are just 10 examples of top SEO agencies.

Narrowing down the selection and deciding who to go with may seem like a formidable task.

So, before choosing the best SEO agency for you, here are a few hints and tips to make the process easier:

  1. Do your research - it's worth spending some time exploring their website and seeing what services they can offer you and your brand. Get a feel for their vibe – you can normally tell pretty quickly with the best SEO agencies who are genuine and who are trying to spin you a line. Look for evidence and case studies of their previous work that prove they have a track record in your industry, as well as client testimonials which should give you a greater indication of what they are like to work with.
  1. Schedule an SEO consultation - many of the top SEO companies will offer this service for free. This will give you the best insight into their communication methods, how personable they are, and their SEO strategy (i.e. how they intend to help your business). It also means you can decline the chance to work with them without committing to a contract and losing your investment.
  1. Check their pricing strategy - A great SEO company will understand that there is no ‘one-size-fits-all’ when it comes to SEO. Therefore, look out for any bespoke SEO services on offer that allow the agency to tailor their thought processes and decision-making towards your specific business goals. Also, be aware of any tiered plans they may provide and how long the contract is for so you know what you’re committing to.
  1. Check for guarantees - any SEO company guaranteeing an outcome is an immediate red flag. Whilst this may sound appealing and draw you in, nothing is certain, particularly in the world of SEO. Instead, look out for companies with a proven track record of promises to their client and ones with defined, rigorous SEO processes from start to finish that are backed up by data and evidence. Any SEO agency offering guarantees is likely achieving this through unethical or black-hat techniques and should be avoided at all costs.

SEO FAQs

What is SEO?

SEO stands for search engine optimisation – a series of strategies to help understand a website’s content and its performance and identify changes that could be made to help it rank higher on search engine results pages (SERPs).  

Why SEO is important

SEO is important for businesses for various reasons. Primarily, it helps them to rank higher in search results and improve their online visibility. In turn, this should help attract more customers and increase sales/revenue. Over time, this builds trust with their client base and reinforces to Google (and other search engines) that they are a respected organisation within their field, thus cementing their rankings and online performance.  

How To Do SEO

Knowing how to do SEO takes knowledge, time, and an element of trial and error to see what works and what doesn’t.

Broadly speaking, there are several steps needed to complete a successful SEO strategy, centred around:

  • Keyword research
  • Content creation
  • On-page SEO
  • Link building
  • Technical SEO

It’s also important to monitor the success of your interventions and see what changes need to be made to generate more positive outcomes further down the line.

Some businesses feel confident doing this themselves. But for those with limited time, expertise, and resources, it may be beneficial to enlist the help of a top SEO company, such as Reboot Online.

What is an SEO Agency?

An SEO Agency is a company that specialises in providing professional SEO services with the primary aim of improving your company’s online visibility on search engines like Google, Bing, and Yahoo.  

What are the benefits of hiring an SEO Agency?

Hiring an SEO agency can have many benefits for your business.

Firstly, it will save you time and money by not having to recruit SEO specialists in-house.

You can also tap into the expertise of some of the best SEO providers in the world without having to employ their services full-time. This can help guide your business strategy and deployment methods.

Overall, it should enable you to achieve better online visibility, improve your rankings, and boost the number of leads/conversions for a better ROI.