The top 5 localization companies

The 2026 ranking

TransPerfect leads the Nimdzi 100, 2026 edition. The ranking uses 2025 revenue, so when you read "top," you're looking at company size by revenue, not a score for translation quality or a recommendation for your project.

Here's the order:

1. TransPerfect, United States: $1,320 million.
2. LanguageLine Solutions, United States: $1,100 million.
3. RWS, United Kingdom: $909.2 million.
4. Keywords Studios, Ireland: $850 million.
5. Sorenson Communications, United States: $800 million.

That's the revenue ranking. Your shortlist can look different.

Propio comes next at rank 6, with $566.5 million, followed by Lionbridge at rank 7, with $513.9 million. Propio offers interpretation, translation and localization. Lionbridge offers AI translation and data services, localization, interpretation and games services.

If you're buying services, start with what you need done. If you're looking for work or researching the industry, read the service descriptions alongside the revenue figures. These companies don't all do the same work.

What each of the top 5 does

TransPerfect

TransPerfect pitches AI, smart technology and human precision to large organizations. Its own reported 2025 revenue was $1.32 billion, up 7%.

For your shortlist, the detail to note is its focus on large organizations. Its pitch brings AI and human work together rather than presenting them as separate choices, but you'll still need to ask what that combination would look like for your project.

LanguageLine Solutions

LanguageLine offers interpreting by phone, video and on site, along with translation and localization.

Need someone to interpret a conversation? Those interpreting options are worth looking at. If your request is for written content instead, its translation and localization services are the part to ask about. Don't leave the distinction buried in a general request for "language support."

RWS

RWS sells AI data services, translation and IP services. It also sells language platforms, including Trados and Language Weaver.

There's a software side here as well as a services side, so be specific when you contact it: are you looking for a platform, translation work or AI data services? For job seekers, those are different areas to look into, too.

Keywords Studios

Keywords Studios calls itself the number one technical and creative partner to the video games industry. Localization and QA are among its services.

The games focus is explicit. If you're researching game localization, this is the entry in the top 5 whose own description puts video games at the center of its work.

Sorenson Communications

Sorenson offers language services and ASL interpreting.

Keep that ASL offering in view when you're comparing it with the other companies. A revenue list puts them next to each other, but your request might be much more specific than the broad label "localization."

How big the language industry is

Nimdzi puts the language industry at $72.6 billion in 2025 and $73.4 billion in 2026. The top 100 companies hold 19.8% of it.

That's not the only market estimate you'll see. Slator puts the addressable language solutions and AI market at $30.85 billion in 2025 and expects it to reach $36.10 billion by 2031.

Keep the labels attached. Nimdzi's figure is for the language industry; Slator's is for the addressable language solutions and AI market. If you're using these figures in your own research, quote the source and the market description together rather than treating the figures as interchangeable.

Agency or software: what you need

Start with the work. Do you need phone interpreting, ASL interpreting, game localization, translation or a tool that translates your site's strings? Use that answer to narrow the list before you compare company revenue.

And software appears in the ranking, too: DeepL is at rank 21 in the Nimdzi 100, with estimated 2025 revenue of $197 million. RWS's offerings also include the Trados and Language Weaver platforms.

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Credit is prepaid from $5 and never expires. The first $1 is free, about 400,000 characters on Fast, and you don't need a card for a key. It's in early access; request a key using the Get early access button on translinga.com.

Working with locale files? Its CLI and GitHub Action sync them on every push and translate only new and changed strings. It reads i18next, next-intl, vue-i18n and any JSON. The command is npx translinga sync --to nl,de,fr.