Company lists · Data refreshed September 2026

Top 25 International SEO services based in Spain

Name: International SEO services based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 202 companies tracked

RevenueBase identified 202 international SEO services headquartered in Spain as of September 2026 and tracks 1,022 professional contacts across them, including 168 with verified work emails. Barcelona is the largest hub.

This list covers international SEO services headquartered in Spain, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

202Companies

1,022Contacts tracked

168Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest international SEO services based in Spain

Ranked by team size

Top 25 of 202 international SEO services based in Spain, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to international SEO services: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Bigseo	Partial evidence	Barcelona, SpainHQ checked Sep 20, 2026	51-200	108 contacts →
	Partial evidence “En nuestra agencia SEO en Barcelona somos unos apasionados del posicionamiento web.” Source: RevenueBase Database · checked Sep 20, 2026
2	ATLS	Partial evidence	Barcelona, SpainHQ checked Sep 20, 2026	51-200	89 contacts →
	Partial evidence “ATLS is the strategic partner that drives business expansion into international markets, combining advanced technology, content localization, and multilingual digital marketing.” Source: RevenueBase Database · checked Sep 20, 2026
3	Interamplify	Indirect evidence	Alhama De Murcia, SpainHQ checked Sep 20, 2026	51-200	71 contacts →
	Indirect evidence “Since 2012, at Interamplify, we have become strategic partners for brands and companies seeking to expand digitally on a global scale.” Source: RevenueBase Database · checked Sep 20, 2026
4	Keyweo	Indirect evidence	Barcelona, SpainHQ checked Sep 20, 2026	11-50	38 contacts →
	Indirect evidence “Keyweo is a digital marketing agency founded in 2018 and based in Barcelona.” Source: RevenueBase Database · checked Sep 20, 2026
5	Human Level Communications	Partial evidence	Sant Joan D'alacant, SpainHQ checked Sep 20, 2026	11-50	31 contacts →
	Partial evidence “Since 2001, we've been boosting the online discoverability of leading international companies and media outlets.” Source: RevenueBase Database · checked Sep 20, 2026
6	Convertix	Strong evidence	Madrid, SpainHQ checked Sep 20, 2026	11-50	23 contacts →
	Strong evidence “Convertix is an International SEO & Performance Marketing Agency with offices in Madrid and Milan serving clients in 20+ markets and 10+ languages.” Source: RevenueBase Database · checked Sep 20, 2026
7	Liten Lemon	Indirect evidence	Madrid, SpainHQ checked Sep 20, 2026	1-10	21 contacts →
	Indirect evidence “Liten Lemon es una agencia de marketing digital ubicada en Madrid, España.” Source: RevenueBase Database · checked Sep 20, 2026
8	Sembi Comunicación	Partial evidence	Bilbao, SpainHQ checked Sep 20, 2026	1-10	20 contacts →
	Partial evidence “Sembi Communication is a Digital Marketing Agency experts in SEO (Search Engine Optimization),(Search Engine Marketing), Media Digital Content, Web Design, Community Manager &…” Source: RevenueBase Database · checked Sep 20, 2026
9	Èmfasi Comunicació Digital	Indirect evidence	Sabadell, SpainHQ checked Sep 20, 2026	11-50	15 contacts →
	Indirect evidence “Services of Digital Strategy, Online Marketing and Development of websites and applications in web environment and mobile applications.” Source: RevenueBase Database · checked Sep 20, 2026
10	SEO Coaching	Partial evidence	Barcelona, SpainHQ checked Sep 20, 2026	11-50	15 contacts →
	Partial evidence “Seocoaching es una empresa especializada en posicionamiento web con resultados comprobados y servicios SEO garantizados.” Source: RevenueBase Database · checked Sep 20, 2026
11	Estudio34	Indirect evidence	Barcelona, SpainHQ checked Sep 20, 2026	11-50	13 contacts →
	Indirect evidence “Estudio34 is an online marketing agency based in Barcelona (Spain) that provides digital marketing services to businesses that either need to improve their online visibility or…” Source: RevenueBase Database · checked Sep 20, 2026
12	Optimanova Solutions	Indirect evidence	Puerto De La Cruz, SpainHQ checked Sep 20, 2026	11-50	13 contacts →
	Indirect evidence “In Optimanova we understand Web Optimisation as a way to take the best advantage from your website.” Source: RevenueBase Database · checked Sep 20, 2026
13	Dobleseo	Partial evidence	Vilablareix, SpainHQ checked Sep 20, 2026	1-10	10 contacts →
	Partial evidence “De la mà d’Eva Olivares i Xevi Sañé neix la primera agència 100% SEO a Girona.” Source: RevenueBase Database · checked Sep 20, 2026
14	Lacomunicación	Partial evidence	Quart De Poblet, SpainHQ checked Sep 20, 2026	11-50	9 contacts →
	Partial evidence “Lacomunicación es una agencia de Marketing Digital en Valencia pionera en la consultoría SEO y el marketing digital, servicios que llevamos prestando desde 2004.” Source: RevenueBase Database · checked Sep 20, 2026
15	Jf-Digital Agencia DE Marketing Digital	Partial evidence	Barcelona, SpainHQ checked Sep 20, 2026	1-10	7 contacts →
	Partial evidence “En nuestra Agencia de Marketing Digital, diseñamos e implementamos la estrategia de posicionamiento SEO en buscadores que tu sitio Web o eCommerce necesita para poder mejorar su…” Source: RevenueBase Database · checked Sep 20, 2026
16	Interactiva	Partial evidence	Torrelavega, SpainHQ checked Sep 20, 2026	1-10	7 contacts →
	Partial evidence “Interactivaclic es una agencia ubicada en Cantabria dedicada al marketing online, somos especialistas en posicionamiento en buscadores (search engine optimization - SEO)…” Source: RevenueBase Database · checked Sep 20, 2026
17	Helloseosem	Indirect evidence	Valencia, SpainHQ checked Sep 20, 2026	1-10	7 contacts →
	Indirect evidence “En helloseosem evolucionamos tu negocio para la nueva era digital.” Source: RevenueBase Database · checked Sep 20, 2026
18	Display None Studio	Partial evidence	Valencia/valència, SpainHQ checked Sep 20, 2026	1-10	7 contacts →
	Partial evidence “Si lo que te gusta es el SEO, también le damos caña, toda web que sale de nuestro horno lleva el sello FAST AS A SHARK.” Source: RevenueBase Database · checked Sep 20, 2026
19	AM Consultores	Partial evidence	Barcelona, SpainHQ checked Sep 20, 2026	1-10	6 contacts →
	Partial evidence “Trabajar únicamente centrado en el SEO en los últimos 20 años, en todo tipo de proyectos y sectores, me ha permitido adquirir EXPERIENCIA (si, en mayúsculas) y un pensamiento…” Source: RevenueBase Database · checked Sep 20, 2026
20	Davilac	Indirect evidence	Madrid, SpainHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “Davilac es una agencia especializada en Marketing en Internet desde 2004, que apuesta por la especialización y la investigación como principal rasgo diferencial.” Source: RevenueBase Database · checked Sep 20, 2026
21	Seqmenta	Partial evidence	Vic, SpainHQ checked Sep 20, 2026	1-10	3 contacts →
	Partial evidence “estratègies digitals · seo · sem · social ·” Source: RevenueBase Database · checked Sep 20, 2026
22	Clickcrows	Indirect evidence	Barcelona, SpainHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “At ClickCrows, we're not just passionate about helping businesses thrive in the digital world, we’re obsessed with it!” Source: RevenueBase Database · checked Sep 20, 2026
23	SEO Fiable	Indirect evidence	Sant Adrià De Besòs, SpainHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “Te inquieta ser invisible para tus clientes?” Source: RevenueBase Database · checked Sep 20, 2026
24	Webcafeina Agencia DE Marketing Digital	Indirect evidence	Cáceres, SpainHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “AGENCIA DE MARKETING ONLINE Especializada en sacar rendimiento a la estrategia web de las empresas.” Source: RevenueBase Database · checked Sep 20, 2026
25	Marketaria	Indirect evidence	Simancas, SpainHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “Agencia de Marketing online enfocada al marketing de resultados.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: international SEO services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names international SEO services.
Partial evidence: Its own public description names part of international SEO services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name international SEO services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 202 international SEO services based in Spain

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 168 reachable decision-makers.

Free signup · no credit card

View the full list →

International SEO services based in Spain at a glance

As of Sep 20, 2026

16.4%Verified-email coverage

5.1Average contacts per company

1-10Median size (employees)

16.3%Largest-city concentration · Barcelona

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

172

11-50

51-200

Email recency for this list is measured worldwide rather than for Spain, so it is reported there. Company counts and contact totals on this page are exact for Spain, over 202 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among international SEO services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Spain whose own description of what they do matches “international SEO services”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names international SEO services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among international SEO services, and records with no verified work email. Companies headquartered outside Spain are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 168 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

International SEO services by metro

International SEO services in Barcelona33
International SEO services in Madrid32

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names international SEO services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many international SEO services are there based in Spain?

RevenueBase identified 202 international SEO services headquartered in Spain as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Bigseo, headquartered in Barcelona, tops this list with the largest team on record.

Which city has the most international SEO services?

Barcelona leads with 33 headquartered companies, followed by Madrid (32) and Valencia (12).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 168 verified decision-maker contacts tracked across these 202 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

Ready to reach these companies? Verified emails and direct dials for all 202 international SEO services based in Spain. Start with a free account, no credit card.

Download this list →

Related lists

International SEO services by geography

Browse the directory

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.