Watermark images appear BEHIND check wording. Print logos, photos or other images in gif, jpg, bmp, pic, pcx or tif formats on checks or bank drafts. Watermarks add security to your checks or drafts by making them more tamperproof (harder for criminals to alter). Sample on left made using image file from FedEx website. Sample on right made using one of the many watermark images included with ChecksNet. Resize, move, use color or black & white images.