The Wedding Poster template has a high resolution of 12" x 18" with 250 dpi. This can be printed as 24" x 36" with 125 dpi. All wedding poster templates are in photoshop format (.psd). You must have photoshop software such as photoshop element or photoshop CS to modify or integrate your photos. The templates are also compressed with winzip for fast download. Winzip can be downloaded from www.winzip.com.