---
title: BlackRiver Gemma 4 Multimodal
emoji: 🌊
colorFrom: blue
colorTo: indigo
sdk: static
app_file: index.html
pinned: false
short_description: Gemma 4 E2B/E4B with vision, audio and text running locally on WebGPU.
models:
  - onnx-community/gemma-4-E2B-it-ONNX
  - onnx-community/gemma-4-E4B-it-ONNX
---

# BlackRiver AI · Gemma 4 Multimodal

A standalone BlackRiver AI implementation of Gemma 4 for fully local browser inference with WebGPU.

## Capabilities

- Gemma 4 E2B and E4B model selection
- Text conversation
- Image understanding
- Audio recording and transcription/instruction input
- Streaming generation
- Local browser cache for model weights
- Rendered WebGPU kernel inspection
- No inference server: prompts and media stay on the user's device

The first model load downloads the selected ONNX weights from Hugging Face. A WebGPU-capable browser and sufficient GPU memory are required. E4B requires more memory than E2B.

## BlackRiver AI implementation

This Space packages the models into a unified BlackRiver interface and adds the multimodal browser workflow used here, including image attachment, microphone capture, 16 kHz audio preparation, E2B/E4B selection and media-history handling for reliable repeated generations.

BlackRiver AI does not claim authorship of the underlying models or the original WebGPU research work.

## Credits

- **Gemma 4 models:** Google — [Gemma 4 E2B](https://huggingface.co/google/gemma-4-E2B)
- **ONNX model conversions:** [ONNX Community E2B](https://huggingface.co/onnx-community/gemma-4-E2B-it-ONNX) and [E4B](https://huggingface.co/onnx-community/gemma-4-E4B-it-ONNX)
- **Browser runtime:** [Transformers.js](https://huggingface.co/docs/transformers.js)
- **Original WebGPU demo foundation:** [WebML Community](https://huggingface.co/spaces/webml-community/gemma-4-webgpu-kernels)
- **Original optimized WebGPU kernels:** Fable 5, as credited by the upstream demo

Model use remains subject to the licenses and terms published in the respective model repositories.

## Files

- `index.html` — complete BlackRiver multimodal interface
- `transformers-gemma4.js` — Gemma 4 E2B/E4B Transformers.js adapter
- `landing.js` — landing-page WebGL background

No build step or server backend is required.