Best Translation Services in 2026

TransPerfect is a US-headquartered provider of translation, localisation and related services. It ranked first in the 2026 Nimdzi 100 with 2025 revenue of US$1,320.0 million, a figure Nimdzi marks as verified, meaning it was provided by the company or taken from financial reporting. Nimdzi lists its main business lines as translation, life sciences and legal services. In 2025 the company acquired Apostroph Group in February, TheSpeech in March and the machine-translation company Unbabel in August. Nimdzi says TransPerfect used the Unbabel deal to expand its "LLM-first" capabilities and that Unbabel changed hands at what amounted to liquidation value. TransPerfect's scale allows it to staff large multilingual programmes, such as regulatory submissions, litigation document review and global product launches, from a single vendor.

LanguageLine Solutions was founded in 1982 and is best known for over-the-phone and video interpreting, particularly in healthcare and government. It ranked second in the Nimdzi 100 with verified 2025 revenue of US$1,100.0 million. The company says it has more than 35,000 linguists and that its translators work in more than 410 languages, while on-demand interpreting is available in more than 240. Its translation offer includes certified translation, a same-day service for urgent documents under 500 words, machine translation, website, software, eLearning and video localisation, and Braille transcription. It also integrates translation with the Epic healthcare records system. LanguageLine's website links to the group policies of Teleperformance, but the pages consulted do not state its ownership.

RWS is a UK-headquartered group that combines translation and localisation services, patent translation and language-technology software. It ranked third in the Nimdzi 100 with verified 2025 revenue of US$909.2 million. Nimdzi lists its main business as AI-powered translation software, translation and patents. During 2025 RWS acquired the AI intellectual property of the dubbing start-up Papercup, and Nimdzi cites its partnership with Cohere as an early model for language-provider and AI-lab collaboration. Acolad, the French group that ranked 17th in the Nimdzi 100 with verified 2025 revenue of US$275.4 million, now describes itself as part of the RWS Group. That makes the combined business larger than the RWS figure alone suggests. Buyers include corporate legal and IP departments, life-sciences companies and enterprises that license RWS's translation-management technology.

Lionbridge is a US-based localisation company that says it has created global content for more than 25 years. Nimdzi ranked it seventh with 2025 revenue of US$513.9 million, which is a Nimdzi estimate rather than a company-verified figure. Nimdzi notes that ownership transferred from H.I.G. Capital to KKR, a deal it attributes to investor preference for predictable earnings. Lionbridge's services include AI and machine translation with human quality review, translation of software, video, websites and regulated content, interpreting in more than 380 languages, functional testing, games services, and AI data services drawing on a community it puts at more than half a million experts. It is often used for large technology and life-sciences localisation programmes.

Welo Global is the group name for Welocalize and its sister businesses. Welocalize's site describes it as part of Welo Global and gives a New York address at 136 Madison Avenue. Nimdzi ranked Welo Global 13th with verified 2025 revenue of US$325.2 million and lists translation and localisation, data and AI, technology, legal and life sciences as its main businesses. The group's brands include Welocalize, Welo Life Sciences, Welo Data and Opal, its AI-powered localisation platform. Services cover AI and machine translation, multimedia and eLearning localisation, accessibility, interpreting and product testing. Nimdzi singles out Welo Global, alongside Acolad and Centific, as providers that showed resilience in 2025, and treats it as a leader in data services for AI.

STAR Group is headquartered at STAR AG in Ramsen, Switzerland, and operates in 28 countries. Nimdzi ranked it 19th with verified 2025 revenue of US$226.2 million and lists its main businesses as translation and localisation, platform licensing, automotive and aviation, and manufacturing. Unlike most service providers, STAR develops its own translation-memory and localisation software, Transit, which it licenses as well as using in-house. The group's focus on technical documentation for vehicle, aircraft and machinery makers suits buyers whose content is structured, terminology-heavy and frequently updated, where reusing previous translations lowers costs.

DeepL is a German machine-translation company. Nimdzi first included it in its 2025 ranking and placed it 21st in 2026, with estimated 2025 revenue of US$197.0 million. It lists AI-powered translation software and writing and editing tools as DeepL's main business. Unlike the other entries, DeepL sells software rather than human translation. A free version allows 50,000 characters per user per month, and paid plans cost €7.49 (Individual), €24.99 (Team) and €49.99 (Business) per user per month billed annually, with Enterprise pricing on request. DeepL cites ISO 27001 and SOC 2 Type II certification and states that customer data is not used to train its models. For Pro subscribers, texts are deleted after processing unless otherwise specified.

Smartling combines a cloud translation management system (TMS) with translation services, using AI translation followed by review from human linguists. Nimdzi ranked it 30th with verified 2025 revenue of US$96.7 million and lists its main business as a translation management system and transcreation. Customers named on its site include DoorDash, IHG, Walgreens, Therabody, Trustpilot and Netskope. The platform is sold in Core and Enterprise tiers without public prices and includes rate cards and real-time job cost estimates to track translation spend. Smartling is typically chosen by companies that localise websites, apps and product content continuously and want the workflow automated through integrations, rather than by sending files to an agency.

Argos Multilingual ranked 41st in the Nimdzi 100 with verified 2025 revenue of US$71.7 million. Nimdzi lists translation and localisation, life sciences, and technology and IT as its main businesses. The company cites more than 30 years of experience, more than 400 professionals and over a billion words a year. It lists offices in Dublin, Eindhoven, Kanagawa, Kraków, London and San Francisco, with production offices in Buenos Aires, Córdoba and Rosario. Life sciences, medical and healthcare are listed first among its sectors, followed by technical and manufacturing, technology, financial, HR and corporate communications, and retail. Its size places it between the large networks and boutique agencies, which can suit regulated buyers who want specialist attention without a niche provider's capacity limits.

Alpha CRC is a UK localisation company that has operated since 1987. Nimdzi ranked it 74th with verified 2025 revenue of US$31.1 million and lists technology and IT, video games, and translation and localisation as its main businesses. Its services include translation with machine assistance, transcreation, desktop publishing, functional QA and continuous localisation. It also offers audiovisual dubbing, subtitling and voice-over through Alpha Studios in more than 100 languages, as well as tools for quality evaluation and bespoke language models. Sectors listed include IT and software, medical, automotive, fashion and beauty, consumer goods, edtech, games and media. It is the smallest provider in this list by revenue.