Web push notifications can contain images on Android and Windows. iOS and macOS are not compatible with images.
What is the best format for push notification images?
Any landscape image with a 2:1 aspect ratio should work. For best results, use an image that's 1,440 x 770 pixels or higher.
Do web push notification images support transparency?
The image should be a JPG and does not support transparency.
How to include images in web push notifications?
If you use Progressier, you can upload images when you compose notifications in the dashboard or with our API. If you directly send images using a web push library, fill out the URL of the image in the image parameter.