No specific info about version 3.1. Please visit the main page of PhotoMarks on Mac Informer.
Watermark photos in 1 minute, free download this easy batch watermark app.
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Simple and intuitive application for applying text, image, color and texture watermark on PDF documents in batch fashion.
Star PDF Watermark is a batch photo watermarking tool.
Batch Photo Watermarker allows you to protect your images using watermarks.