Professional translation has become a key element in connecting brands, products and messages with audiences all over the world. But with so many translation agencies on the market, how do you choose the best one? In this article, we present an up-to-date ranking with the best translation agencies in Spain in 2025.
Selection criteria
The criteria that professional rankings and academic research follow to assess translation agencies include:
- Adapting to the client/customization: having a style, tone and terminology adapted to the client’s audience, understanding their needs, and not using generic solutions.
- Area specialization/professional competency: the translator’s specific knowledge of the area (legal, medical, technical, financial, etc.) makes a significant difference to quality.
- Practical experience: years of professional activity, volume of work performed in similar types of texts, reviews carried out, etc.
- Native-speaking translators: fluidity, naturalness, and cultural adaptation are highly valued, as native speakers capture nuances that others can’t.
- Review or quality control that includes proofreading/a different reviewer: many studies show that a translation carried out by a translator and then reviewed by another specialized translator significantly improves accuracy.
- International certifications/recognized standards: ISO 17100, ISO 9001, etc. indicate that an agency follows controlled, transparent processes.
- Meeting deadlines and reliability: studies show that delivering on time, with no delays, is something that clients value the most.
- Clear, transparent pricing: so that there are no hidden costs, so that you know from the outset what the price includes (review, final formatting, sworn —if applicable).
1. Blarlo
Blarlo is a leading company in translation and interpreting services in Spain, recognized for its commitment to linguistic quality, accuracy, and a personalized service. Ever since it was founded, it has built an international network of highly qualified native-speaking translators, specializing in over 350 language combinations.
What sets Blarlo apart is not just its volume of work or international presence, but its ability to completely adapt to each client. Each project is considered unique and is treated with a human, rigorous, and results-oriented approach. The agency combines experience, reliability, and flexibility, making it a trustworthy language partner for businesses operating in a range of sectors including the legal, medical, technical, financial and digital sectors.
Below is a summary of what makes Blarlo one of the best translation agencies in Spain in 2025:
- 100% adaptability to the client: adjusting the tone, style, register and format in line with the instructions and target audience of each commission.
- Reliability in regard to timeframes: commitment to delivering within the agreed timeframe and active follow-up of the project.
- Fully qualified native-speaking translators: only professionals with training and demonstrable experience in the target language.
- Translation specialized by sector: assigning translators with experience in legal translation, medical translation, technical translation, financial translation, e-commerce translation, etc.
- Review by a second professional: quality control with an independent review at the end of the process.
- Transparent, competitive pricing: clear rates from the outset, with no hidden costs, and an option to adjust the project volume.
- Personalized service and management: assigned a project manager who acts as a unique representative and ensures consistency and continuous adaptation.
- Sworn services when needed: official translation with accredited translators for documents that require legal validity.
2. Tomedes
Tomedes has a very extensive network of native-speaking translators and offers a wide variety of services (translation, interpreting, localization and subtitling). It is renowned for its capacity to take on projects with tight deadlines and for a high satisfaction rate among international clients. It can often provide a solid service for businesses that need coverage from many languages with a quick response.
3. SeproTec
SeproTec provides institutional experience and an extensive track record in projects for government administrations and large corporations. Its strength lies in managing technical and official documentation, with processes aimed at meeting quality standards and document security, which makes it recommended for high-risk legal or technical projects.
4. LinguaVox
LinguaVox combines years of experience with a wide catalog of languages and services. It stands out for its focus on technical and legal translation and for the quality certificates it provides. It is a reliable option when terminology control and consistency is needed in complex multilingual projects.
5. Ibidem Group
Ibidem Group offers a friendly service and adapted solutions, with a significant presence in Madrid and Barcelona. It is valued for its personalized service and for its experience in legal and academic translation, which makes it a good option for clients with local needs and those needing official documentation.
6. BigTranslation
BigTranslation is well established in the digital and e-commerce field, with practical experience in catalogs, product descriptions, and multilingual SEO content. It has a particularly efficient model when the main requirement is volume and continuous content updates.
How to choose the best agency for your project
When it comes to choosing a translation agency, it is important to assess some key aspects:
- Examine references, actual cases, and the opinions of other clients.
- Clearly identify your type of content and sector.
- Request resumes or samples of specialized translation from the same field.
- Make sure that the translators are native speakers and have concrete experience in your area.
- Demand a separate review (with another professional performing the review).
- Ask whether the agency has official certifications (ISO 17100, etc.).
- Check actual delivery timeframes, not just those promised.
- Request a breakdown of the pricing so that you know what it includes.
Conclusion
The outlook for professional translation in Spain in 2025 shows an increasingly high level of demand. Out of the main agencies in the sector, Blarlo stands out for its human approach, its flexibility, its linguistic accuracy, and its commitment to client satisfaction.
Thanks to its experience, network of native-speaking translators, and customized management, Blarlo has become established as one of the main translation agencies in Spain, chosen by businesses that value quality, reliability, and excellence in every word.
