Hey @Spongefile! If you look above your post you will see that the last comment was 11 months ago. Please try not to revive old threads 
If you have an issue you can make a new thread specifically for that problem
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When uploading an image, you can resize it by dragging the blue handle.
It’s hard to keep its proportions the same this way, so I recommend doing it in a separate image program.
But you can also resize the sprite when the object’s panel is open, again with the blue handle.
Or you can resize the object using Logic like this: Once → Number → Size
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Adding to others’s thoughts, you can make it easy by using Lospec’s pixel art resizer , really great and simple tool that I use all the time
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