Edit: Internet outage caused me to double-post as I didn't realize it went through the first time.

Please delete this or the other one, thank you
After a long hiatus I'm hoping to get back into some more pixelating, but I'm running into a problem that I didn't have previously, and I feel like I'm missing something obvious. Basically, all the ways I've tried uploading my images add some AA, which is bad enough by itself, but doesn't agree with the nearest-neighbor styling used in this forum, which causes things to look really messed up.
Example:

I can't exactly do a side-by-side of how it should look, but hopefully it's clear where the issues are (especially if zooming in and out). The original image is a clear PNG and looks fine in practice - it's only after upload that it begins to look blurry.
I've looked into imgur and checked the "high quality images" box which I read would fix this, but no dice. Other uploading sites that I tried tamper with the image the same if not more. This seems like something mind-numbingly simple so I'm not sure what I'm missing. Like I said I never ran into this issue before so maybe I'm going crazy. Any help would be appreciated.
EDIT: It's been a very long time, but if anyone somehow has found this and has a similar problem,
yrizoud was correct in his reply: my display setting was at 125%. What made this weirder is that for my laptop (windows 8 ) it didn't actually show any percentages, just a slider from "smaller" to "larger". Not very helpful. Moving it to "smaller" fixed things. windows UI is tiny and uncomfortable, but things actually display correctly, which is sometimes more important.
