A:AI, CDR vector files are strongly recommended, HD files like PSD,PDF,JPG,BMP,GIF,TIFF are acceptable. No matter what format, please make sure that your design is clear enough for our printing.
Depending on the resolution and pixels, PSD,JPG,TIFF files get blurry when enlarged. Thumbnail JPG or GIF cannot be used for large printing. If submitting these files, please follow these guidelines:
100% scale(full size output)at 100dpi
50% scale at 200dpi or higher
25% scale at 300dpi or higher
10% scale at 600-1200dpi
Vector: line art is scalable to any size, it never loses resolution and the image stays clean and crisp. Vector files can be submitted to any size.
In addition, if you are strict with color, you’d better provide color in CMYK or PANTONE.