Photo Watermark Studio is perfect to add watermark over batches of photos at once.
Website: http://www.pcwinsoft.com/batch-photo-watermark-software.asp
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Download: Pcwinsoft-Photowatermarkstudio-2.3.4.50.zip
Photo Watermark Studio is designed with the best practices on watermark photos in mind.
Photo Watermark Studio allows you to overlay your photos with transparent text stamps and transparent image stamps. The program supports a great deal of fonts and several effects can be applied to text including colors, rotation, shadow, underline, and more.