Your browser ships with a GPU, a neural network runtime, and enough horsepower to run real AI models. So why are we still round-tripping every inference call to a server? This talk shows how to run LLMs, vision models, and embeddings entirely client-side using Transformers.js, ONNX Runtime, and WebGPU. You'll see live demos of text generation, image classification, and semantic search — all running in a browser tab with zero backend. Walk away knowing which models fit in the browser today, where the performance cliffs are, and how to ship private, offline-capable AI features your users actually trust.