Genshin Impact supports 13 Text Languages and 4 Voice-Over Languages,
You can change them independently and use any combination you like!

Supported Text Languages:

English, Simplified Chinese, Traditional Chinese, Japanese, Korean, Indonesian, Thai, Vietnamese, German, French, Portuguese, Spanish, Russian.

Supported Voice-Over Languages:

English, Chinese, Japanese, Korean.

Here's how to change them:

Step 1: Open the Paimon Menu by selecting Paimon's portrait at the top left corner of your screen.
(or press ESC if you're playing on PC, or press Options button on your controller if you're playing on PS4).
*Note: Travelers on mobile need to reach the first Statue of The Seven before they can access the Paimon Menu.

Step 2: Select "Settings.

Step 3: Select "Language.

Step 4: Select the Text and Voice-Over Languages you want to use.