How to Build a Private Offline Voice Assistant with Gemma 4 12B: A Complete Local Setup Guide

A developer’s guide to running Google’s 11.95B-parameter multimodal model with local STT/TTS on a 16 GB laptop under Apache 2.0.

TL;DR: Download Gemma 4 12B (~6.7 GB at 4-bit) into a local runtime such as Google AI Edge Gallery, pair it with a local STT/TTS stack, and expose a local endpoint.…