This plugin can automatically add image and text watermark to pictures as they are uploaded to WordPress media library. You can also watermark existing images manually (all at once or an every single image). Features include:
- image watermark can be a jpg, png or gif
- jpg files, gif files and text can have opacity set (from 0 to 100%)
- text watermark is created using ttf fonts
- text color, size and rotation can be set
- all built-in image sizes can be watermarked (thumbnail, medium, large and fullsize) as well as all additional sizes registered by themes or plugins (since 0.4.3)
- fully translatable