# Background

> Blur, remove or replace the background in Facecast with engines that run in your browser, a chroma key for green screens, and what is loaded from third parties.

Source: https://facecast.geenius.io/docs/background/

Facecast can change the background behind you, in your browser.

## Modes

None, blur, remove, or replace with a colour, a picture or a looping silent video. Edge softness, stability and hair detail have sliders, and each engine starts from its own tuned values. A mask view shows what the engine sees.

## Engines

MediaPipe (selfie, landscape and multiclass), BodyPix, MODNet, PP-HumanSeg, or your system's own background effect where it exists. The engines run in a Web Worker so the page stays smooth. If a worker cannot load an engine, it runs on the page and the readout says which.

## Chroma key

For a green or blue screen, or a colour you pick. Choose **Pick from the camera**, click the colour on the live picture, and tune similarity, smoothness and spill.

## What is loaded from outside

> [!HONEST]
> The engines are third-party models and Facecast does not bundle them. The first time you use one, your browser downloads it from jsDelivr, Google model storage or Hugging Face. Those services see the request for the file. Your camera picture is processed on your machine and is not sent to them.