Do your print-on-demand stickers have weird artefacts, smudges, spare pixels etc. around them, and you don't know why? Wanna fix it, but don't know how? I've got the simple answer for you, and it'll only take a few minutes to make your stickers look awesome again.
I had a issue with uploading my artwork to sell on Threadless, and reached out to their customer support service. What I learned may be known to some of people, but it was new to me, and I want to share it with you so your uploads will look their best!