[nimrody]

Unrelated: anything similar for increasing photo resolution? I frequently encounter cases where users upload low resolution images (transferred using Whatsapp or similar) and need to increase the resolution to get something suitable for printing.

[jtriangle]

There's nothing automated that produces reliably good results with a variety of content currently.

I've tried https://bigjpg.com https://imglarger.com https://vanceai.com/image-enlarger/ https://www.upscale.media https://photoaid.com/en/tools/ai-image-enlarger https://waifu2x.org <- specifically for animated stuff

Given the similarity of the results of some of these, I'd guess they're using the same model with some input parameter tweaks.

Waifu2x is probably the closest to "reliable" if you're looking to enlarge some sort of animated content.

[coel]

I was checking out one of the suggestions in another comment for background remove and they seem to have this functionality to increase resolution: https://clipdrop.co/apis/docs/super-resolution

[rand0mx1]

https://news.ycombinator.com/item?id=32628761

[8bithero]

I recently came across https://imglarger.com/ which is an AI image enlarger. I haven't used it yet so can't give a review, but they there is a free plan you can try and even their paid tiers seem reasonably priced.