I work on pixel art stuff so this always bothers me. Windows 10's default imageviewer does this to the images:
and while it's great for some types of images it doesn't work with what I usually have to look at. Something that bothers me is that when I close the program it shows the image without blurriness for a split second, so I wonder if I there's a way to completely disable the feature. Good program alternatives are also appreciated.
The default Windows 10 app for viewing pictures is Photos. On the other hand Windows Photo Viewer is an older app, which I - and many others - preferred. You can still enable this program on Windows 10 to get the old behaviour back. Here's A tutorial on how to do it, although it requires some registry edits, which always seem a bit scary. It worked perfectly for me though. See comparison below:
Not blurry - Windows Photo Viewer
It also offeres greater maginification and seems more responsive / is quicker to open
Updated answer:
Now I'd recommend ImageGlass instead.
A more fully featured and customizable image viewer that also do not apply any anti-aliasing:
https://imageglass.org/
Original answer:
You could give 'Emulsion' a try: https://arturkovacs.github.io/emulsion-website/
It's fast and minimalist with entirely optional anti-aliasing.
If you don't want to download a new program, you could use Paint (Windows accessories>Paint). Open your image, select view, zoom in and there are the pixels. Check the grid lines box to make the pixel boundaries even clearer.
