---
license: mit
library_name: transformers.js
pipeline_tag: text-to-speech
base_model: onnx-community/chatterbox-ONNX
tags: [tts, chatterbox, webgpu, onnx]
---

# Chatterbox for the browser

A repackaging of [onnx-community/chatterbox-ONNX](https://huggingface.co/onnx-community/chatterbox-ONNX) sized for in-browser use.

Two changes from upstream:

- **`speech_encoder` is a 6 KB stub.** transformers.js hardcodes it into
  Chatterbox's session list, so it is fetched whether or not you use it — 564 MB
  of model that a text-to-speech app never runs. The speaker conditioning it
  would produce is instead precomputed once and shipped as `voices/default.bin`
  (250 KB), passed straight to `generate()` as `speaker_embeddings`,
  `speaker_features`, `audio_features` and `audio_tokens`.
- **Only the q4f16 language model is included**, not the fp32 copy.

Together these take the download from ~1.4 GB to ~865 MB.

Because the stub is never called, this repo **cannot clone a new voice** — it can
only speak in the bundled one. Use the upstream repo for cloning.

Built for [Natural Voice](https://huggingface.co/spaces/arjun10g/natural-voice).
Weights remain MIT, as upstream.