9 Best Bulgarian Translation Services: Expert Recommendations for 2026

Bulgarian translation demands more than word-for-word conversion. The language’s Cyrillic script, complex grammar, and specialized terminology in technical and legal fields require expert-level linguistic knowledge. Companies expanding into Bulgarian markets face challenges with character encoding, regulatory compliance, and cultural nuances that can derail global growth. Bulgaria’s economy continues attracting foreign investment, making accurate translation a business priority. This research-backed comparison evaluates 9 Bulgarian translation service providers across language expertise, technology platforms, compliance standards, and customer support. Our analysis helps you select a partner that delivers quality, speed, and cost control for your Bulgarian translation needs.

Why Bulgarian demands expert-level translation

Bulgarian presents unique translation challenges that require specialized expertise. The Cyrillic alphabet and complex grammatical structures demand translators who understand both linguistic intricacies and technical terminology. Regulatory compliance in sectors like finance, healthcare, and manufacturing requires precise translations that meet Bulgarian legal standards. Software localization must handle character encoding correctly to avoid display errors. Bulgaria’s growing role in European manufacturing and IT outsourcing creates opportunities for companies that invest in professional Bulgarian translation services. Expert providers combine native-speaker knowledge with industry-specific terminology databases, ensuring your content resonates with Bulgarian audiences while maintaining technical accuracy and brand consistency.

9 best Bulgarian translation services at a glance

• Milengo
• Prevodi. BG
• ADAPT Bulgaria
• Oltrans Translation Agency
• PoliLingua 
• Sigma Translations Agency
• AEDA.bg
• TEZA Translation Agency
• The Native Translator 

Our picks for the 9 best Bulgarian translation services

Company name	Years operating	Price	Compliance & security	Integrations	Customer support
Milengo	34+ years	$0.021 – $0.092/word	ISO 17100, ISO 18587, ISO 5060	150+ platforms, automated workflows via client portal, enterprise grade	Dedicated client teams, instant support across EU/US/Asia time zones, localization strategy consulting, client portal, <1 day quote
Prevodi. BG	21+ years	Quote-based	ISO 17100, ISO 9001	SDL Trados, MemoQ	Plovdiv office, phone, email, app, in-person
ADAPT Bulgaria	25+ years	Quote-based	EN 15038, ISO 17100:2015	SDL Trados, MemoQ, Wordfast, Transit, Across	Contact options on the website
Oltrans Translation Agency	19+ years	Quote-based	ISO 17100:2015, MFA contract, NDAs	Protemos, SDL Trados, MemoQ, Memsource	Dedicated PMs, fast quotes
PoliLingua	20+ years	$0.09 – $0.21/word	ISO 17100, ISO 18841	Portal/API, e-commerce/CMS plugins	Sofia office, phone, email in Bulgarian
Sigma Translations Agency	26+ years	Quote-based	ISO 9001:2015, EN 15038	WordPress, CAT tools, Adobe InDesign/Illustrator	Sofia offices, phone, email in Bulgarian
AEDA.bg	19+ years	Quote-based	Licensed by the Bulgarian MFA	Translation Memory tools, HIPAA-compliant transfers	Live chat, phone, multiple offices
TEZA Translation Agency	32+ years	Quote-based	ISO 17100:2015	Zoom, Teams (RSI), LMS platforms	English/German support
The Native Translator	20+ years	Quote-based	ISO 17100:2015, ISO 27001, ISO 14001	API for CMS automation, file injection	N/A

Milengo

Milengo brings over 35 years of experience to Bulgarian translation services, serving software, hardware, electronics, logistics, finance, and IT industries. Their tailored linguistic management handles both standard Bulgarian and specialized terminology for technical and legal translations. Localization engineering ensures the correct rendering of Bulgarian characters and diacritics in software and web interfaces. ISO 17100 certification guarantees high-quality translations for complex technical documents. AI-assisted workflows combine AI translation with human expertise to reduce costs and speed up high-volume translation projects. Transparent pricing ranges from $0.021 to $0.092 per word, depending on content complexity and service level.

Why it’s good for Bulgarian translations: Milengo’s expertise in the linguistic intricacies of Bulgarian makes it the preferred choice for technical, legal, and business contexts. Their AI and human translation workflows deliver high-quality, cost-effective Bulgarian translations, integrating with software and digital environments.

Compliance & security: Milengo holds ISO 17100 for translation services, ISO 18587 for post-editing of AI translation output, and ISO 5060 for translation quality. These certifications ensure rigorous quality control and compliance with international translation standards.

Integrations: Milengo provides API-driven automations via their client portal LanguageDesk and support 150+ platform integrations, including Figma, GitHub, WordPress, Schema ST4, Contentful, and HubSpot, as well as in-house engineering team to handle custom enterprise integration requests.

Customer support: Dedicated client teams provide support across major global time zones (EU/US/Asia) with expert focus on localization strategy consulting. Self-service is possible via the client portal LanguageDesk, with fast response times (quote in less than 1 day) and comprehensive client onboarding support.

Pros	Cons
Advanced AI-assisted workflows reduce costs while maintaining quality	Premium pricing may exceed budgets for small-scale projects
ISO 17100, 18587, and 5060 certifications ensure the highest quality standards	Learning curve for clients new to API-driven automation
Transparent pricing structure from $0.021 to $0.092 per word
150+ CMS/TMS platform integrations streamline workflows
Dedicated client teams across EU/US/Asia time zones

Wondering what the translation rates are for Bulgarian? Check them out and see how we can help you grow globally.

Prevodi.BG

Prevodi.BG operates as one of the largest agencies in Bulgaria with a massive capacity for high-volume projects, utilizing a network of over 1,500 linguists. With 21+ years of experience, they serve legal, financial, technical, medical, pharmaceutical, and IT sectors. They maintain strict ISO 17100 and ISO 9001 certifications, ensuring rigorous quality control for complex government and corporate tenders. Their comprehensive end-to-end legalization service handles all bureaucratic steps with the Ministry of Foreign Affairs and foreign consulates. They offer a diverse portfolio covering rare languages and specialized technical formatting (DTP) for user manuals and industrial drawings.

Why it’s good for Bulgarian translations: Prevodi.BG is fully integrated with SDL Trados Studio and MemoQ, allowing for the import and export of translation memories to maintain consistency for repeat clients. Native Bulgarian translators ensure precise translations in technical and legal fields.

Compliance & security: Prevodi.BG holds ISO 17100 and ISO 9001 certifications, ensuring quality management systems meet international standards for translation services and business operations.

Integrations: They use standard CAT tools such as SDL Trados to ensure terminology consistency and speed. Full integration with SDL Trados Studio and MemoQ supports translation memory management.

Customer support: The head office in Plovdiv provides full native Bulgarian support via phone, email, app, and in-person consultations.

Pros	Cons
Network of 1,500+ linguists handles high-volume projects	Best value for ongoing or larger projects rather than very small one-off jobs
ISO 17100 and ISO 9001 certifications ensure quality
End-to-end legalization service simplifies bureaucratic processes
Native Bulgarian translators provide linguistic accuracy

ADAPT Bulgaria

ADAPT Bulgaria is a certified Bulgarian translation and legalization provider authorized by the Ministry of Foreign Affairs, delivering official and specialized translations across 40 languages. The agency works with 200+ sworn translators and subject-matter specialists, including medical, legal, and IT-focused linguists, enabling accurate handling of regulated documentation and technical content. For large-scale or time-sensitive projects, ADAPT Bulgaria can deploy translator teams with editors, supported by a flexible pricing model for ongoing collaboration and high volumes.

Why it’s good for Bulgarian translations: ADAPT Bulgaria combines official-document expertise with specialized domain coverage, making them a strong fit for companies needing Bulgarian translations for regulated, government-facing, or highly technical materials—especially when legalization or certification is required.

Compliance & security: ADAPT Bulgaria is certified to BS EN 15038:2006 and BS EN ISO 17100:2015, reflecting standardized translation workflows and quality control from order intake through delivery.

Integrations: The company supports online ordering and can handle a wide range of document types, including specialized scientific and technical texts, with terminology managed through field-matched translator assignment and review.

Customer support: Clients can reach the team via online order forms, phone, or e-mail, with offices in Sofia and Sevlievo providing local accessibility for urgent projects.

Pros	Cons
ISO 17100 certified translation workflows	Fewer public details on the technology stack and the CAT tool integrations
Authorized for official document translation and legalization	Quote-based pricing with limited upfront rate transparency
200+ sworn translators and specialized subject-matter coverage
Strong fit for legal, medical, IT, and regulated documentation

Oltrans Translation Agency

Oltrans Translation Agency distinguishes itself as a tech-forward agency in Plovdiv, being the first in Bulgaria to implement specific EN 15038 quality management systems with 19+ years of experience. They operate a proprietary workflow heavily focused on CAT (Computer-Assisted Translation) tools to build extensive terminology databases for long-term clients. Their unique business start-up support service assists foreign companies with the translation and legalization of documents required to register firms in Bulgaria. They maintain a strong focus on technical engineering and software localization, utilizing verified expert linguists rather than generalists.

Why it’s good for Bulgarian translations: Oltrans heavily relies on SDL Trados and MemoQ for engineering projects, ensuring that repetitive technical terms are translated automatically to reduce costs. Centralized glossaries standardize terminology across documents.

Compliance & security: Oltrans holds ISO 17100:2015 certification and maintains an MFA contract. They use private servers and NDAs for confidentiality protection.

Integrations: They use the Protemos Project Management System, which allows for high transparency in tracking project progress. Full integration with SDL Trados Studio, MemoQ, and Memsource supports CAT workflows.

Customer support: Dedicated project managers provide fast quotes and ongoing support throughout the translation process.

Pros	Cons
First in Bulgaria to implement EN 15038 quality systems	Quote-based pricing without transparent rate information
Business start-up support for foreign company registration	Limited information about global support coverage
Extensive terminology databases for long-term clients
The Protemos system provides project tracking transparency

PoliLingua

PoliLingua is a global language services provider with a strong presence in Europe and worldwide, offering translation, localization, interpreting, and multilingual SEO solutions. Founded in 2002, the company operates through a large network of over 35,000 linguists covering more than 200 languages. Their services span industries including legal, life sciences, finance, IT, hospitality, retail, energy, game localization, and government, combining native‑speaker expertise with rigorous quality workflows.

PoliLingua provides a broad suite of language solutions beyond translation, including sworn and certified translation, voice‑over, subtitling, interpretation (including over‑the‑phone), desktop publishing (DTP), and machine translation post‑editing (MTPE). Their technology ecosystem includes API and portal access, along with e‑commerce and CMS plugins that support automated content workflows and seamless integration with client systems.

Why it’s good for Bulgarian translations: PoliLingua’s deep resources in hospitality, tourism, and marketing localization make them a strong choice for Bulgarian translations that require cultural nuance and engaging storytelling — particularly for brochures, guides, itineraries, websites, SEO content, and travel‑focused materials handled by native linguists.

Compliance & security: PoliLingua is certified to ISO 17100:2015 for translation services and holds ISO 18841 certification for interpreting services, reflecting adherence to international standards for quality and process.

Integrations: Their platform supports portal and API access for translation management, and plugins that facilitate integration with e‑commerce and CMS systems to streamline multilingual content workflows.

Customer support: Clients benefit from local support in Sofia, with phone and e‑mail assistance in Bulgarian, as well as international support via PoliLingua’s global office network.

Pros	Cons
Large global linguist network covering 200+ languages	Less focus on deeply technical sectors like engineering
Comprehensive service portfolio (translation, SEO, voice‑over, interpreting)
ISO 17100 and ISO 18841 certified workflows
Portal and API integrations for workflow automation
Strong cultural and tourism/localization expertise

Sigma Translations Agency

Sigma Translations Agency’s strategic presence in Varna allows for deep specialization in maritime, shipping, and naval engineering documentation with 26+ years of experience. They focus heavily on sworn translations and legalization, maintaining direct operational links with the Ministry of Foreign Affairs for rapid document processing. They offer a Mobile Office service capability, delivering urgent translation and legalization services directly to corporate clients in the region. ISO 17100 certification guarantees that technical maritime manuals meet international safety and regulatory standards.

Why it’s good for Bulgarian translations: Sigma uses advanced DTP tools (Adobe InDesign, Illustrator) to integrate translated text back into complex layouts like brochures or maritime maps. They maintain client glossaries using standard CAT tools.

Compliance & security: Sigma Translations Agency holds ISO 9001:2015 and EN 15038 certifications for quality management and translation services.

Integrations: They specialize in translating WordPress and online shop content through content export. Standard CAT tools maintain client glossaries, and Adobe InDesign and Illustrator handle DTP requirements.

Customer support: Offices in Sofia offer full phone and email support in Bulgarian.

Pros	Cons
Maritime and naval engineering specialization	No local presence outside Bulgaria for sworn translations
Direct Ministry of Foreign Affairs links for legalization	WordPress integration requires content export rather than automation
Mobile office service for urgent corporate needs
Advanced DTP tools for complex layout integration
ISO 17100 certification for technical manuals

AEDA.bg

AEDA.bg positions itself as a boutique specialist in the medical and pharmaceutical sectors, working directly with clinical research organizations (CROs) with 19+ years of experience. They operate a dedicated legalization department that navigates the complex apostille and consular verification process for foreign documents. They use a subject-matter expert selection process, ensuring that medical discharge summaries are translated by linguists with medical degrees. They maintain a client-centric consultative approach, advising clients on the specific legalization treaties between Bulgaria and other nations to save costs.

Why it’s good for Bulgarian translations: AEDA.bg uses HIPAA-compliant (or EU equivalent) data transfer methods to safely integrate with clinical research organizations (CROs) handling patient data. Translation memory tools reduce costs for repetitive text in long-term projects.

Compliance & security: AEDA.bg is licensed by the Bulgarian MFA for official translations, though no specific ISO certification is listed.

Integrations: They use translation memory tools to reduce costs for repetitive text in long-term projects. HIPAA-compliant data transfer methods support CRO integration.

Customer support: Live chat in Bulgarian, phone support, and a network of physical offices across Bulgaria provide comprehensive client assistance.

Pros	Cons
Medical and pharmaceutical sector specialization	No stated ISO certification
Subject-matter experts with medical degrees	Limited information about technology platform capabilities
Dedicated legalization department for apostille processing
Consultative approach to legalization treaties
HIPAA-compliant data transfers for CRO integration
Live chat and multiple office locations

TEZA Translation Agency

TEZA Translation Agency is a Bulgarian language services provider offering professional translations, interpretation, and technical event support. Headquartered in Sofia, TEZA combines language expertise with conference‑level interpretation equipment rental for international events. The agency works with a network of experienced translators and interpreters and provides services in legal, technical, medical, financial, IT, engineering, and media fields. They support both written and oral services, including simultaneous and consecutive interpreting, backed by technical equipment such as soundproof booths and complete audio systems.

TEZA also specializes in integrating language services with educational technology, including localization of e‑learning content and support for learning management systems (LMS). Their interpreting services extend to virtual events with remote simultaneous interpretation (RSI) via platforms such as Zoom, Teams, and Webex, supported by technical administration and support teams.

Why it’s good for Bulgarian translations: TEZA offers a broad range of language services and is particularly strong in delivering integrated solutions for educational clients and hybrid events, ensuring translation outputs are compatible with LMS and virtual meeting platforms.

Compliance & security: The agency holds ISO 17100:2015 certification for translation services, assuring structured workflows, quality control stages, and consistency across projects.

Integrations: TEZA provides technical support for remote interpretation on Zoom, Teams, and Webex, and can assist with LMS integrations to support localized educational content.

Customer support: As a Bulgarian‑based company, support is available locally in Sofia, with client contacts via phone and e‑mail primarily in English or German, with Bulgarian language support where possible.

Pros	Cons
Decades of language services and interpretation experience	Less emphasis on large‑scale web/SaaS localization services
Interpretation equipment rental for conferences	Limited visibility of advanced content workflow integrations (no public TMS/API details)
E‑learning localization and LMS integration support
ISO 17100:2015 certified translation workflows
Remote and in‑person interpretation with technical support

The Native Translator

The Native Translator operates a direct online platform allowing users to upload documents and receive an instant quote and delivery deadline within seconds, with 20+ years of experience. They guarantee a quality assurance model where every translation is performed by a native speaker of the target language, backed by ISO 17100 certification. They specialize in speed, offering a service model designed to deliver certified translations of birth certificates and legal papers in under 24 hours. As part of the global The Translator Group, they provide immediate access to over 5,500 specialized translators for virtually any language pair.

Why it’s good for Bulgarian translations: The Native Translator supports direct file injection from major CMS platforms, streamlining the workflow for global news sites and e-commerce platforms. They hold both ISO 17100 and ISO 9001, ensuring strictly regulated quality assurance workflows.

Compliance & security: The Native Translator holds ISO 17100:2015 for translation services, ISO 27001 for information security, and ISO 14001 for environmental management.

Integrations: They offer an API that lets you automate the ordering and retrieval of translations directly from your CMS or business system. Direct file injection supports major CMS platforms.

Customer support: The Native Translator provides 24/7 online support via its ordering platform, with email assistance available for project inquiries. Regional contact details are listed for localized support across Europe.

Pros	Cons
Instant quote and delivery deadline within seconds	Quote-based pricing without transparent rates
24-hour turnaround for certified translations
Access to 5,500+ specialized translators
ISO 17100, ISO 27001, and ISO 14001 certifications
API for CMS automation and file injection
Native speaker guarantee for all translations

Selection criteria and review methodology for Bulgarian translation services

This list was compiled through a global review of 9 translation companies specializing in Bulgarian translation services. Our evaluation methodology examines six comprehensive dimensions to ensure recommendations reflect real-world business requirements:

1. Language expertise: Providers must demonstrate proven expertise in Bulgarian, including knowledge of linguistic nuances, regional dialects, and specialized terminology. We reject generalists in favor of companies with in-depth language-specific proficiency, particularly in technical, legal, and medical fields where precision is non-negotiable.
2. Service scope: We require end-to-end language solutions, including document translation, website localization, software and app localization, regulatory document translation, multilingual customer support, and transcreation for marketing. Providers must handle diverse content types across multiple industries.
3. Operational maturity: We prioritize providers with scalable workflows, ISO certifications (17100, 18587), and a proven track record of handling high-volume, complex Bulgarian translation projects with consistent quality under tight deadlines. Years of operation and client portfolio diversity factor into this assessment.
4. Technology readiness: We demand providers who utilize AI-powered tools, TMS integrations, QA automation, and secure APIs. Their technological infrastructure must support high-volume Bulgarian translations while maintaining quality and efficiency through CAT tools, translation memory systems, and workflow automation.
5. Business resilience: We verify financial stability, transparent pricing, and adaptability to market shifts, including changes in language regulation and technological advancements. Providers must demonstrate the ability to scale services and manage evolving client demands without compromising quality.
6. Customer support: We evaluate support channels (chat, email, phone), availability, SLAs, dedicated project managers, client success managers, incident response times, and multilingual support availability. Providers must offer communication channels that match client operational needs across time zones.

This methodology ensures recommendations deliver measurable value for Bulgarian translation services implementation, balancing quality, cost, and operational efficiency.

Why choose Milengo for Bulgarian translations

Milengo stands out as the preferred choice for Bulgarian translation services, combining over 35 years of experience with advanced technology and rigorous quality standards. Their expertise spans software, hardware, electronics, logistics, finance, and IT industries, making them the partner of choice for companies requiring technical precision and linguistic accuracy.

• Advanced AI-assisted workflows: Milengo combines AI translation with human expertise to reduce costs and accelerate high-volume translation projects without compromising quality. Their approach delivers cost-effective Bulgarian translations at scale.
• Comprehensive ISO certifications: ISO 17100 for translation services, ISO 18587 for post-editing of AI translation output, and ISO 5060 for translation quality ensure the highest standards in every project. These certifications guarantee compliance with international quality benchmarks.
• Localization engineering excellence: Milengo ensures correct rendering of Bulgarian characters and diacritics in software and web interfaces, preventing display errors that can damage user experience and brand reputation.
• Transparent pricing structure: Pricing from $0.021 to $0.092 per word provides clear cost expectations based on content complexity and service level, eliminating budget surprises and enabling accurate project planning.
• Extensive platform integrations: LanguageDesk API supports 150+ platforms integrations, including Adobe Experience Manager, WordPress, Sitecore, Salesforce, and HubSpot, streamlining enterprsie-level content workflows.
• Global support coverage: Dedicated client teams provide support across the EU, US, and Asia, with a focus on localization strategy consulting. Fast response times and comprehensive onboarding support ensure project success from start to finish.

Ready to streamline your Bulgarian translation process? Get started to see how the right translation partner can accelerate your global growth.