Is there a software or program where I can create my own Monogram decals?

I'm into monogramming and I have been just been ordering them off line, But it starts to get expensive. I use them for iphone buttons, ipad chargers, labeling beats, laptops, cleats, you know? And I was wondering if there was software i could get so I could just do it myself! Like Avery or microsoft? Where I only download it once(if i even have to) and just buy the printing paper! If you know of anything please help!

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