My sprites and backdrops are seriously fuzzy. Can someone help?

when I receive [MapleSyrup_ v]
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Well, it depends on the level of fuzziness. Are they just a little pixelated? If so, and you are using the bitmap editor, I recommend switching to vector mode. I mostly use bitmap, but vector is based off of shapes, while bitmap is based off of pixels. So bitmap is more pixelated than vector.
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Edit: I'll ask this to be moved to the Questions About Scratch forum for you, as you don't seem to need any help with your scripting.

It's the poor quality of Scratch's default setting. If you are importing your own pictures, this will be especially apparent. As long as you want cartoon-style graphics, the best way to fix this is “Vector” mode. This can be activated using the image editor. Sprites made in this mode won't be fuzzy, but it is much harder to use. Most Scratchers struggle with it, and the most I can do with it is some text, maybe some simple buttons. When used correctly, though, Vector can increase the aesthetics of a project tremendously.

I recommend seeing some tutorials on the subject!

If a picture uploaded is larger than 480*360 Scratch will automatically resize it making the quality go down.
If that's not why, try activating Stage3D mode.

I seem to have found out a solution. I just needed to activate a sprite that isn't fuzzy/blurry and it seems to go away.

P.S., They were just fuzzy at the edges, you can't really notice from a distance, but close up it is clearly visible.

when I receive [MapleSyrup_ v]
eat cheese
end