Blurry images problem


I have a problem with blurry images on preview / review. I would like to add into my course tiny images (21 px) that are originally big (290px).

Since we can't add a SVG file on Storyline, which option do I have to resize my images without loosing quality ? I've tried so many websites / softwares but it's looks like I can't find a solution.

Many thanks

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