Marketplace Purchases with large transparent borders

is there any utility that allows me to crop out the ridiculously oversized transparent portions of images without having to download & do by hand with GIMP or similar? Using the trap token pack I bought as actual traps with the It's a Trap API script is nigh impossible because the 'actual' token size is enormous (due to transparent sections) and by default will trigger when players stand near them, many of the tokens are almost impossible to select individually because their transparent borders overlap too.

I've mentioned this same issue in the past, regarding the huge transparent areas that surround many tokens purchased from the marketplace. Unfortunately, I know of no solution other than editing them one by one, by hand, to trim away the excess transparency. It's tedious work, but at least you only have to do it once.