To make sure your designs are printing well on product, you’ve got to keep to Dimensions & Format. You can upload images in PNG, and JPG format with RGB color profile and dimensions of at least 25 inches width by 20 inches length. Dpi can be as low as 72 dpi and up to 300 dpi.
If you would like to design over the whole printable area, we recommend uploading a high-quality image with minimum resolution of 2400 by 3300 pixels. The maximum supported image size is 20 MB.
A good rule of thumb is that big, high-resolution files make the best prints. Now when we say ‘big’, we're really referring to resolution, not the file’s size. There is a major difference between file size, which is measured in bytes (like megabytes MB) and resolution, which is measured in pixels. When you’re printing work, it’s the pixels that matter.
When uploading your files to Marpple, we can only accept PNG, JPG and GIF. TIFF and PDF files won't work correctly.
RGB works best for viewing designs on the web. For the best of both worlds, you want to design your work in the CMYK format. Then before you upload, you should convert the finished work into the RGB color profile.
Here’s an example of images size you might work on.