2. The Ideal File Format: PNG with Transparent Background

While vector files are ideal for the source, for uploading to print-on-demand platforms like Printify, the most commonly accepted and versatile "print-ready" file format is a PNG (Portable Network Graphics) with a transparent background.

<ul> <li><strong>PNG Advantage:</strong> PNGs support transparency, meaning anything that isn't part of your design will be invisible, allowing the color of the T-shirt to show through.</li> <li><strong>Resolution:</strong> The PNG should be exported at a minimum of 150 DPI (dots per inch) for apparel, but **300 DPI is the industry standard** for a crisp, high-quality print.</li> <li><strong>Size:</strong> The image dimensions should be large enough to cover the desired print area (e.g., 4500x5400 pixels for a full-chest T-shirt print).</li> </ul> Always double-check your print provider's specific recommendations for DPI and dimensions.