Details about the format and quality of an image.


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

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

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
Basic support Yes11414548 Yes1

1. This feature is supported but not exposed through the 'extensionTypes' object.


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

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.

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Contributors to this page: wbamberg
Last updated by: wbamberg,