I use adobe lightroom. It has an enhanced algorithm that really does a very good job at upscaling images. You might also try https://imglarger.com/. Source: over 1 year ago

But this time I just googled and ended up with https://imglarger.com/ that did the job well. Source: over 1 year ago

I don't, but try imglarger.com, it's A.I. That scales up an image, I always get amazing results. Source: almost 2 years ago

Hey, this picture looks so cooool!! I save your original image and upload it to imglarger.com to sharpen it. Here is the result. I am not sure if it is what you want. But I think the the color and contrast is better after the image is sharpened by imglarger. Source: almost 2 years ago

Image was upscaled with imglarger.com as Dall.E's output images are way too small. Source: almost 2 years ago

There are better, but to get an idea try something like: https://imageresizer.com/image-enlarger. Just needs a sharpening. Source: almost 2 years ago

Now how did I manage to get this printed in 4k? Welp turns out that AI upscaler are WAYYYYY better than I thought. Scarily good in my opinion. As many in this thread have already said, image upscaling was my way to go. So thank you very very much. I used the website https://imageresizer.com/image-enlarger for this image because my original image was too big for waifu2x. I printed it on europosters.de because I... Source: over 2 years ago