Ideally, the image should be created at 300 dpi.
The general rule is that if your image appears pixelated or blurry as you view it on the screen, then it will be the same, or slightly worse, once printed.
This is because our machines are so sophisticated that they pick up every detail.
Not sure on your artwork quality? Don't worry, our expert artworkers review every order and we will contact you if we don't think we can get a great result with your upload.
You can also review our artwork guidelines here: http://www.clothes2order.com/pages/artwork-guidelines/