Easy Watermark can automatically add watermark to images as they are uploaded to wordpress media library. You can also watermark existing images manually (all at once or an every single image). Watermark can be an image, text or both.
Watermark Plugin for WordPress
On one image you can have two watermarks! One of them can be text watermark and the other image watermark. You can control their position and size and apply them to your media independently.
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