We recommend working with experienced designers for best result. Preferred file format PDF Vector files. Our default software Adobe Illustrator, however we need PDF Vector files. Outline yours fonts, embed your images, use CMYK colours only. Avoid using complex colours, main colours work best. If you use photoshop provide us separate on layer PSD files. Most photoshop file will not be suitable for this print process, we need Vector PDF from vector based programs like Adobe Illustrator and similar vector based software. We will do our best to see if we can make your file work. Some Photoshop files might be OK. Artworking service available at £20 per hour. File checking service available and we will offer basic adjustment for free if your file overall designed professionally and suitable.