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(+1)

All basic key characters fit into 16x16 tiles. No key character has a height greater than 16. Special characters like ALT, or ENTER,  are 32px and 48px wide respectively (I am talking about tile size).

I'll plan on doing a split of all icons at some point in the future.

Cheers.

I think you should regroup sprites by distinct size. That would help cut.