Transcribe voice messages from iMessage/WhatsApp to text?

Hello CiaraMkm,

Welcome to Apple Support Communities!

We understand that you're inquiring about a voice to text transcription option with iMessage and third-party app audio messages.

We would suggest checking out Get started with accessibility features on iPhone to learn more about accessibility features on iPhone and how to configure them. There are several features for text and speech, however, there is no feature for transcribing iMessage audio messages to text. There may be third-party apps in the App Store that you can download for that though.

We would suggest submitting Product Feedback on this.

Take care.