Weird "artifacts" when using snap to grid?

Complete noob here (On Aseprite and pixel art in general).

I’m editing a PNG where 1 “logical pixel” (is it called that way?) = 4x4 actual pixels. I want to keep the original resolution, so instead of resizing, I enabled the grid (set to 4x4), turned on Snap to Grid, and started drawing with a 4px square brush.

But I’m getting weird artifacts on verticals, even though everything should be snapping cleanly.

Anyone know what might be going wrong? Am I missing a setting or using the wrong tool?

Snap to grid doesn’t mean that you’re drawing in 4x pixels now, it just snaps your brush strokes to the grid, if you want a drawing with 4x pixels you should make it normally and then just use the export feature and set the scaling to 400%

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Thank you so much. In reality i want my “physical” px (i.e., the 1px Pixel Brush) to behave like the logical pixels. That would mean to downscale to 25% - right? Is there a way to keep the resolution as is and “draw with logical pixels”?

You would need to make a custom brush which would be a 4x4 square and there should be a setting in the custom brush settings to make it behave how you want to but it would only be able to be a 1x1px brush and I just don’t recommend it. What I do recommend you to do is to just select the whole image with Ctrl A, switch to the rectangle select tool and click on the selection (It’s important) and then on the top aseprite will show you the dimensions of the selection. let’s say the dimentions are 128x256, you can select each value and just divide it by 4 in aseprite, just next to 128 type /4 and it will automatically divide it, do the same to the other value. now your picture is shrinked 4 times without using export

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