T-shirt design is one of the most accessible and profitable print-on-demand businesses — platforms like Printful, Printify, Redbubble, and Merch by Amazon allow you to sell designs without holding inventory. Creating a successful T-shirt design starts with a high-resolution, print-ready PNG file. At imgresizr.com, you can create T-shirt design images and prepare them for print-on-demand services, for free.
T-Shirt Design Specifications
| Specification | Value |
|---|---|
| Printful recommended | 4500×5400px at 150dpi |
| Redbubble | 7632×9933px (A3 print area) |
| Merch by Amazon | 4500×5400px transparent PNG |
| Format | PNG with transparent background |
| Colour mode | sRGB (not CMYK for most POD) |
How to Create T-Shirt Designs at imgresizr.com
Create your design in imgresizr.com on a transparent background — PNG format throughout. Use the Text and Caption tools for typography-based designs — quote shirts, slogan tees, and typographic art are among the best-selling T-shirt design categories. Use the Shapes tool for graphic elements. Use the Enhance tool to ensure all colours are vivid and saturated — screen printing and DTG printing reproduce bold, saturated colours most accurately. Use the Background Removal tool to ensure your design has a fully transparent background — no white areas that will print as white on the shirt. Resize to your POD service's specifications using the Resize tool. Export as PNG with transparency. Upload directly to Printful, Redbubble, or your chosen POD platform.
T-Shirt Design Best Practices
- Research best-selling designs in your niche before creating — successful designs solve a problem or speak to a community
- Test your design mock-up on a dark shirt — white-background designs are invisible unless they have transparent backgrounds
- Keep designs print-area aware — most T-shirt prints are 30×30cm maximum; designs must be readable at this scale
- Create both light and dark shirt versions of each design — different colour schemes for different shirt colours
- Typography-only designs (quotes, slogans, community references) are lower cost to create and often higher converting than complex graphics
Create T-shirt designs for Printful, Redbubble, and Merch by Amazon, free at imgresizr.com.