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Translation Companies
Review leading marketing localization agencies serving USA clients, with company profiles that explain each provider's expertise, delivery focus and fit.
Use the comparison to build a shortlist, then review each agency profile for its specialty, location and approach.
Updated October 10, 2026
Side-by-side comparison of leading providers serving USA clients
| Company | Specialty | Location | Website |
|---|---|---|---|
| #1TransPerfect | Consistently named the largest language service provider globally by revenue in the CSA Research and Nimdzi rankings. | New York, NY, USA | Visit site |
| #2RWS Holdings plc | Publicly listed language and content company among the largest LSPs worldwide. | Chalfont St Peter, United Kingdom | Visit site |
| #3Lionbridge Technologies | Among the largest global LSPs, covering translation, localization, AI training data and testing. | Waltham, MA, USA | Visit site |
| #4LanguageLine Solutions | Among the largest LSPs by total revenue and ranked the number one provider of SPOKEN-WORD INTERPRETATION in the world by Nimdzi, a position it has held… | Monterey, CA, USA | Visit site |
| #5Welocalize | Named among the largest global LSPs, with strength in regulated content, life sciences and legal translation alongside subtitle and dubbing localization… | Saratoga Springs, NY, USA | Visit site |
| #6Keywords Studios | Dominant in game localization and increasingly in media localization. | Dublin, Ireland | Visit site |
| #7Iyuno | One of the largest enterprise-level MEDIA localization providers, with a vast global studio network serving major Hollywood studios and top-tier streami… | Seoul, South Korea / London, United Kingdom | Visit site |
| #8Certified Languages International (CLI) | Consistently ranked in the CSA Research Top 100 Language Service Providers on verified revenue, specialising in over-the-phone and video remote interpre… | Portland, OR, USA | Visit site |
| #9PTW | Global services provider named among the leading game localization vendors, covering translation, localization QA, audio production and player support f… | Tokyo, Japan / London, United Kingdom | Visit site |
| #10Unbabel | AI-plus-human translation provider named among leading media and content translation vendors, combining machine translation with human post-editing for… | Lisbon, Portugal | Visit site |
Use this comparison to identify a shortlist, then review the detailed company profiles and USA buyer’s guide below.
Review the available information for each provider before requesting references, pricing and a project proposal.
Consistently named the largest language service provider globally by revenue in the CSA Research and Nimdzi rankings. Delivers translation, localization, interpretation, multimedia and language technology across effectively every vertical and service line in this section.
Visit website →Publicly listed language and content company among the largest LSPs worldwide. Acquired SDL, so SDL-branded offerings now sit within RWS - several 2026 sources still list the two separately, which double-counts one company.
Visit website →Among the largest global LSPs, covering translation, localization, AI training data and testing. Operates Lionbridge Games as a dedicated game localization division, and is geared toward subtitle and dubbing workflows with traceable QA records.
Visit website →Among the largest LSPs by total revenue and ranked the number one provider of SPOKEN-WORD INTERPRETATION in the world by Nimdzi, a position it has held since those rankings debuted in 2019. See the Interpretation Services tab.
Visit website →Named among the largest global LSPs, with strength in regulated content, life sciences and legal translation alongside subtitle and dubbing localization workflows with review and QA steps.
Visit website →Dominant in game localization and increasingly in media localization. Delivers translation, transcription, dubbing support and QA-focused language testing at production scale. See the Game Localization tab.
Visit website →One of the largest enterprise-level MEDIA localization providers, with a vast global studio network serving major Hollywood studios and top-tier streaming platforms at scale.
Visit website →Consistently ranked in the CSA Research Top 100 Language Service Providers on verified revenue, specialising in over-the-phone and video remote interpretation alongside translation.
Visit website →Global services provider named among the leading game localization vendors, covering translation, localization QA, audio production and player support for games and interactive media.
Visit website →AI-plus-human translation provider named among leading media and content translation vendors, combining machine translation with human post-editing for customer service and content operations at volume.
Visit website →Compare delivery models, rates, contracts and risk before selecting a provider for a US engagement.
This page lists 10 marketing localization agencies providers that work with United States clients. We look at delivery track record, whether the team overlaps with US time zones, how they scope and price work, and whether they can sign standard US contracts including an MSA, SOW, NDA and mutual indemnity.
Firms currently featured include TransPerfect, RWS Holdings plc, Lionbridge Technologies, and LanguageLine Solutions.
Delivery footprints on this list span New York, NY, USA, Chalfont St Peter, United Kingdom, Waltham, MA, USA, and Monterey, CA, USA, so you can choose between onshore US delivery, nearshore teams with 3–5 hours of overlap, and offshore teams priced for volume work.
US buyers usually see three engagement models for marketing localization agencies: fixed-scope projects, time and materials with a monthly cap, and a dedicated team retainer. Onshore US consultancies typically bill $141–$250 per hour, nearshore partners in Latin America $55–$95, and offshore teams $25–$55.
Ask for a rate card by role, not a blended rate — a blended number hides how much of the work is done by junior staff. For fixed-bid work, insist on a written change-order process, and for retainers, confirm the notice period and any minimum monthly hours.
Watch the total cost of ownership: discovery workshops, knowledge transfer, post-launch support, and the cost of taking the work back in house at the end.
Before you sign, confirm the provider carries professional liability (E&O) and cyber insurance with US-acceptable limits, and that the MSA clearly assigns IP ownership of all deliverables to you on payment.
If the engagement touches regulated data, get the compliance posture in writing: SOC 2 Type II for the provider's own systems, HIPAA with a signed BAA for health data, CCPA/CPRA handling for California consumer data, GLBA for financial services, and background-check policies for anyone with production access.
Also nail down worker classification and subcontracting — many US buyers require written approval before any part of the work is passed to a third party.
Run the same questions past two or three firms from this list and compare the answers side by side — the differences are usually more revealing than the proposals.
Practical answers for USA clients comparing providers, pricing and engagement models.
