Image prep for print-on-demand

JPG has no transparency. Save a cutout as JPG and the empty area fills with a solid color, usually white, which then prints as a visible box on a shirt, mug, or sticker. PNG supports an alpha channel, so the background stays truly empty and only your design lands on the product. That is why every major POD platform expects PNG upload files.

The fix is a clean cutout exported as a transparent PNG. Drop your art into the background remover, check the edges on the transparency checkerboard, and export, no white box, no halo.

• Transparency. A real alpha channel (PNG, not JPG) so the product shows through around your design.
• Enough resolution. Print needs far more pixels than screens. Aim for ~300 DPI at the final print size, often a 4500×5400px file for apparel. Low-res art prints blurry or pixelated.
• The right dimensions. Each product has a print area. Match the platform's recommended file size so your design isn't cropped or shrunk.

1. Remove the background so the subject sits on transparency.
2. Verify the transparency on the checkerboard preview, and check the edges on a dark background so no white fringe slips through onto dark garments.
3. Resize to the platform's print-file dimensions (or a target you choose) without re-introducing a background.
4. Optional: make color variants by recoloring the design, one upload becomes a full set.
5. Export a transparent PNG and upload it as your print file.

DPI (dots per inch) only matters relative to the print size. A 1500×1500px image is crisp as a 5-inch sticker (300 DPI) but soft as a 15-inch shirt graphic (100 DPI). The rule of thumb: pixels ÷ print inches ≈ 300. So a 15-inch-wide print wants ~4500px of width.

You can always size down without losing quality, never count on sizing up, enlarging a small image just stretches the same pixels and prints fuzzy. Start from the highest-resolution source you have.

• Printful / Printify. Transparent PNG print files; 150 DPI minimum, 300 ideal; apparel print files are commonly ~4500×5400px. See the dedicated Printful guide below.
• Merch by Amazon. Transparent PNG, 4500×5400px, under 15MB. A clean cutout is mandatory.
• Etsy. Two jobs: clean listing/mockup images, and digital-download PNGs (clipart, sublimation) that buyers expect truly transparent. See the dedicated Etsy guide below.
• Redbubble / Society6 / Gelato. All take transparent PNGs at high resolution; check each product's current template size before exporting.

• Uploading a JPG. Prints a white box around the art, the single most common POD mistake.
• Low resolution. Looks fine on screen, prints blurry. Check pixels against the print size.
• A white halo / fringe left around the cutout, very visible on dark garments. Always review edges on a dark background.
• Wrong dimensions, so the platform crops or shrinks your design off-center.