How to Transcribe WhatsApp Voice Messages Using Google Cloud Speech-to-Text API

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A technical guide published on DEV Community outlines a four-stage pipeline for automatically transcribing WhatsApp voice messages using the Google Cloud Speech-to-Text API. The process covers audio capture via the WhatsApp Cloud API or automation tools like n8n, format conversion from .ogg to WAV or FLAC using FFmpeg, cloud storage, and final transcription. Google Cloud's Speech-to-Text supports over 125 languages and uses advanced models such as Chirp 3, trained on millions of hours of audio, making it well-suited for Brazilian Portuguese. Research by Sampaio et al. (2021) found that the Google Cloud API achieves one of the lowest Word Error Rates among competing ASR solutions for Brazilian Portuguese. The guide aims to help corporate and academic users overcome productivity and accessibility challenges posed by the growing volume of WhatsApp voice messages.

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