Link building remains one of the pillars of SEO: without quality links supporting your domain, no matter how well optimized your content is, it will be much harder to improve rankings on Google.
The problem is that acquiring these links manually (contacting site by site, negotiating prices, and writing custom content) consumes time that most businesses don’t have.
That’s why more and more companies and SEO agencies are turning to platforms and agencies specializing in link building.
What is link building and why is it still key?
Link building is the SEO discipline responsible for acquiring external links (backlinks) from other websites to yours.
Each link acts as a vote of confidence for Google: the more quality and thematically relevant links you receive, the more authority your domain gains and the better your pages rank in search results.
It’s not about accumulating links indiscriminately. A well-planned link building strategy considers:
- The authority and real traffic of the linking medium, not just its vanity metrics.
- Thematic relevance between the linking site and the site receiving the link.
- The naturalness of the link profile, varying anchor texts, domain types, and publication pace.
- The quality of the content in which the link is inserted, written to provide real value to the reader.
How to choose a link building agency or platform
Before deciding on one option or another, it’s worth evaluating several aspects:
Transparency: You should be able to see which media your links will be published on, with real traffic and authority metrics, before paying for them.
Quality over quantity: Be wary of anyone who promises hundreds of cheap links in a short time: that pattern often leads to a penalty.
Flexibility: Each project needs a different approach depending on its sector, competition, and budget, so the agency or platform must adapt to you, not the other way around.
Reporting: You need to know which links have been acquired, where, and with what result, to measure your return on investment.
Support and guidance: Especially if it’s your first campaign, having a team to advise you makes the difference between success and wasted budget.
With that clear, let’s get to the list.
The best link building agencies and platforms in Spain
1. Publisuites: the leading marketplace for link building and sponsored content
Publisuites is, for many SEO professionals, the first choice when it comes to getting quality links in Spain. Founded in 2014, this platform connects advertisers with a network of over 17,000 verified media outlets: digital newspapers, thematic blogs, and social media profiles; to buy sponsored posts, reviews, and mentions with links.
What differentiates Publisuites from a traditional agency is that it puts control in your hands: you can filter media by domain authority, estimated traffic, country, language, and price, and decide for yourself where you want to publish. You can choose between inserting your link into an already published article (immediate impact) or ordering a complete custom-written sponsored post.
Its strengths include:
- One of the largest and most verified media networks in the Spanish market.
- Advanced metric filters (DA, traffic, theme, language) for informed selection.
- Periodic verification that purchased links remain active, with replacement if an editor removes them.
- A Managed Service, designed for those who prefer to delegate the entire campaign: an SEO specialist handles media selection, content writing, and strategy execution from start to finish.
- Possibility to monetize your own blog or social media if you also want to act as an editor.
It is the most complete option for businesses of any size: from those starting their first link campaign to agencies managing link building for dozens of clients.
2. SIDN Digital Thinking
SIDN is a digital marketing consultancy founded in 2002, headquartered in Granada with offices in Madrid and San Francisco (USA).
Its main activity revolves around SEO and online reputation management (ORM), working with clients in sectors such as banking, insurance, tourism, and education, and developing projects in several languages for different markets.
It’s an option to consider if you’re looking for a consultancy with international experience that combines link building with broader positioning and brand reputation strategies.
3. NeoAttack
NeoAttack is a Spanish digital marketing agency with over a decade of experience, offering link building as part of a broader SEO service.
It designs link strategies tailored to each client’s budget and combines them with other services such as internal linking optimization, broken link recovery, technical SEO, web development, or social media.
It’s a good alternative if you prefer to centralize several marketing services, in addition to link building, with a single agency.
4. Portavoz
Portavoz is a communication agency based in Murcia and Madrid, specializing in press offices, public relations, and press releases, complemented by digital marketing and SEO services.
Its link building approach is closely tied to media appearances through press releases and journalist relations, making it particularly interesting if your goal is to gain presence in general press in addition to acquiring links.
5. GO2JUMP
GO2JUMP is an online marketing agency with offices in Barcelona and Madrid, certified as a Google, HubSpot, LinkedIn, and Meta partner, and specializing in B2B marketing for sectors such as industrial, financial, educational, and healthcare.
Its link building service starts with a prior analysis of the website and competition to design a link strategy from sectoral blogs, directories, and media, ensuring the naturalness of the link profile.
It’s a solid option for B2B companies looking for an agency with comprehensive digital marketing services.
6. UnoDigital
UnoDigital is part of the group of Spanish agencies that offer digital marketing and SEO positioning services to SMEs, integrating link building into broader online visibility strategies.
As with any generalist agency, it’s always advisable to ask for case studies and a detailed proposal of what type of links their service includes before hiring.
7. SeDigital
SeDigital is a digital marketing agency based in Madrid, specializing in SEO and SEM, and certified as a Google Partner.
In addition to search engine positioning, it works on local SEO and managing advertising campaigns on Google Ads and social media.
Its positioning services include link building as part of a broader SEO strategy, along with technical and content auditing.
It’s an alternative to consider if you’re looking for a medium-sized agency with a strong focus on measurable results.
8. Social11
Social11 is a digital marketing agency based in Zaragoza, with over a decade of experience, specializing in web design, software development, and SEO positioning.
Among its SEO services, it includes link building as part of its positioning strategies, primarily aimed at SMEs looking for personalized support without strict contractual obligations.
9. Roiback
Roiback is a particular case on this list: it is not a generalist link building agency, but a company specializing in technology and digital marketing for the hotel sector, with over a decade of experience helping hotels boost their direct sales channel.
Its digital marketing offering includes SEO services aimed at improving the visibility of the hotel’s website in search engines.
This is an option to consider only if your business belongs to the tourism or hotel sector.
10. AgenciaSEO.eu
AgenciaSEO.eu offers link building services as part of its SEO positioning proposal, with the aim of improving the authority and relevance of its clients’ domains.
Its working method follows the classic agency model: identifying relevant and quality link opportunities, and building relationships with trusted websites to acquire legitimate links.
11. Gureak Marketing
Gureak Marketing is part of Grupo Gureak, a Basque business group with over five decades of track record and a strong commitment to employment inclusion.
Its marketing division offers digital transformation, relational marketing, and SEO positioning services, including link building and international SEO, within a comprehensive marketing and communication services approach for businesses.
Quick comparison
| Agency / Platform | Service Type | Ideal for |
| Publisuites | Link building marketplace with optional Managed Service | Any business, from self-management to 100% delegated service |
| SIDN | SEO and ORM Consultancy | Companies with international projects |
| NeoAttack | Comprehensive SEO agency | Those looking for multiple digital services from a single agency |
| SoyWebmaster | SEO Forum/Community | Learning about link building, not managed campaigns |
| Portavoz | Communication and Press Office | Media presence and press releases |
| GO2JUMP | B2B Marketing Agency | Industrial, financial, or healthcare companies |
| UnoDigital | Digital Marketing Agency | SMEs with general SEO needs |
| SeDigital | SEO/SEM Agency | Measurable results at local and national levels |
| Wiss | Digital Marketing Agency | To be evaluated on a case-by-case basis |
| Social11 | Digital Marketing Agency | SMEs seeking personalized service |
| Roiback | Hotel Technology and Marketing | Hotels and hotel chains |
| AgenciaSEO.eu | SEO Agency | Classic link strategies |
| Gureak Marketing | Comprehensive Marketing Group | Companies seeking 360º communication services |
Frequently asked questions about link building agencies in Spain
How much does a link building campaign cost in Spain?
The price varies greatly depending on the media’s authority, the sector, and the volume of links you need. On platforms like Publisuites, you can start with adjusted budgets and scale your investment based on the results you achieve, which is harder to do with agencies that require contracts or fixed packages.
Is a managed agency or a self-service platform better?
It depends on your time and your SEO knowledge. If you prefer to have total control over which media you choose and how much you invest, a platform like Publisuites, with the option to activate its Managed Service when you need it, offers the best of both worlds.
How many links do I need to rank my website?
There’s no universal number: it depends on the competition in your sector and the current state of your domain. What’s important is not the quantity, but the quality and naturalness of the link profile you build over time.
Does link building still work in 2026?
Yes. Links continue to be one of the most valued authority signals by Google, provided they are acquired naturally, with thematic relevance, and without patterns that could be interpreted as algorithm manipulation.
