How to increase resolution of an image on Windows 11/10?

Waifu2x is a free, open-source AI upscaling tool, and it is a reliable solution for how to increase resolution of image, especially optimized for anime, illustrations, and pixel art.

It allows you to upscale images up to 4x while reducing noise, but it works best on non-photorealistic content like cartoons and line art.

First, download the software from the official repository and open it, then drag and drop the image into the main window.

Select your desired scale (2x is recommended for most use cases), choose a denoise level (leave it at 1 if you’re upscaling photos), and click Start to begin the process. Wait for the upscaling to finish, then save your high-resolution output files.

This method is ideal for users who want to upscale anime or artwork, but it is not the best choice for realistic photos compared to other AI models.

If you want a free, offline tool for upscaling illustrations, you can try this method. This is a straightforward solution to how to increase resolution of image for creative projects, so you should test it on a sample image first to get the best results.