1/ Template Sizes - Before you start to design, set up your art file with the best settings for a t shirt print. (See below)
2/ Create your design
3/ Convert Fonts to outlines - (Adobe Illustrator only)
4/ Resize artboard to the outer limits of your design
Illustrator - Edit Artboard - Shift + O
Photoshop - Image > Trim Transparent Pixels - Check Top, Bottom, Left & Right
5/ Export final design as a PNG with a clear background
Illustrator - Export as > PNG
Photoshop - Export as > PNG - Transparency checked as on
6/ Upload your saved PNG file to the 24 Hour Merchandise Design Tool