In this video, I show you the very basics of the built in text-to-image Stable Diffusion feature in Photopea.
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I also use:
Topaz Gigapixel - amazing software for upscaling to much higher resolutions without sacrificing quality. It's a perfect partner to Photopea in my opinion. Check it out here:
https://topazlabs.com/ref/1862/
(affiliate link)