Supernotes cards support jpg, png and gif images. During edit mode, images are represented by their file path in Markdown. The exclamation mark at the start denotes that this is an image:

There's a few different ways you can add an image while editing a card:

Just copy any image (jpg, png or gif) and paste it into a card. The image will automatically upload and generate a markdown image link.

While editing a card, drag and drop an image at the location you'd like to insert it in the card body. Once you drop it in, the image will upload and generate a markdown image link.

While in card edit mode, use open the Universal Coupler by either clicking the ( + ) in the top right or using the / or \ keybinding; then select "Image". From here you can drag & drop, paste or browse for image (jpg, png and even gifs). Once your image has finished uploading, it will be inserted into your card formatted in the Markdown language.

When you finish your card, the image will be shown like the cute cat example below:
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You may add an image by just using a link to external url, but do this at your own risk as there is no guarantee that the link is secure / will be there indefinitely (unless it's yours!)

This feature has been deprecated in Supernotes 1.8, and will no longer function.

If you want to change the size of your rendered image you can append the modified dimensions =WIDTHxHEIGHT  at the end of the Markdown code like the following:

 In this example the image have a width of 100px and a height of 200px.

You can upload as many images as you like, so long as you doing so for normal personal, education or work use. However uploading images for ‘outside of note-taking’ i.e. as a dedicated file storage or for enterprise tasks, such as TBs and 100,000s of images are not supported. Uploaded images are also optimised to make sure everything runs snappy when using Supernotes across different clients.