Tenger Plugin: bulk watermark
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Smart Watermark
Plugin allows you to add image watermark to images uploaded to the WordPress Media Library and add watermark to old images via bulk processing tool
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ImgMarkFactory
Add professional watermarks to your images with real-time preview and drag-and-drop positioning. Support for both text and image watermarks.
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Watermark Manager
Apply text or image watermarks to WordPress media uploads with batch processing, templates, and backup/restore.