Details about the format, quality, area and scale of a captured image.


Values of this type are objects. They contain the following properties:

format Optional

extensionTypes.ImageFormat. The format of the resulting image. Default is "png".

quality Optional

integer. When format is "jpeg", this controls the quality of the resulting image. It is a number between 0 and 100, which is converted to a value between 0 and 1 and then used as the encoderOptions argument to HTMLCanvasElement.toDataURL(). If it is omitted, 92 is used. As quality is decreased, the resulting image will have more visual artifacts, and the number of bytes needed to store it will decrease. This value is ignored for PNG images.

rect Optional

An object specifying the area of the document to capture, in CSS pixels, relative to the page. All properties default to 0. The properties are:

  • x: The coordinate of the left side of the rectangle.
  • y: The coordinate of the top side of the rectangle.
  • width: The width of the rectangle.
  • height: The height of the rectangle.

This option was introduced in Firefox 82. If omitted, the currently visible viewport is captured.

scale Optional

number. The scale to render at, defaults to devicePixelRatio. This option was introduced in Firefox 82.

Browser compatibility

BCD tables only load in the browser

Note: This API is based on Chromium's chrome.extensionTypes API. This documentation is derived from extension_types.json in the Chromium code.