# Render when ready

July 26, 2020

We have added the [`render_when_ready` parameter to image creation](/parameters/render_when_ready/). This gives you control over when the image is rendered.

By setting `render_when_ready` to `true`, we will wait to generate the image until your HTML calls the `ScreenshotReady()` function in JavaScript.

This is useful for images that have complex JS and you need control over when it’s ready to have an image created.

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