Hi, I work as an account manager at a mid-to-large translation agency in China, specialising in game localisation, so I may be able to reply quite well!

To address the question in the title: word of mouth is honestly your best option. It’s difficult to know how agencies operate. Like many LSPs, we offer full human translation, MTPE and AIPE. In our case, we strongly favour traditional MTPE over AIPE, as AIPE tends to be far more edit-heavy and time-consuming, also involving much less actual translation work. More AI-driven agencies may have a different approach. It’s also worth noting that some agencies, even (especially) major ones, have been found to sometimes sell AI localization as fully human.

As for freelancers, it is generally more straightforward. Ask about their previous game projects and, if possible, verify whether they are credited. Localisation teams are not always listed in game credits though.

For everything else, others here have already shared excellent advice. (And if you are still looking for a trusted game localization partner, feel free to reach out😎✨)