You can upload your files in the following formats:
JPG, PDF,EPS, TIFF, PS (PostScript)
Make sure that your PDF file is saved directly from a graphic program in the PDF/X-standard (PDF/X3 or PDF/X1a) format. In order to avoid issues with layers and transparencies in the printing process, it is advised to use the “compatibility 1.3” setting while saving your artwork.
If you are submitting your files in TIFF format, please make sure you reduce the layers to only one layer.
In order to prevent problems with variations in color or print image, please don’t use the pre-separated DCS EPS data.