Handmade by talented professionals
XImageSharing: Watermark mod
Watermark uploaded images with custom watermark picture to protect them from leeching / promote your site.
From admin mod settings you can choose what users can use their own watermark: Admin only / Selected users / Premium accounts / All users.
From Watermark Management page you can set up: Watermark image / it's Position / Padding / Opacity.
You can upload and use transparent PNG images with alpha channel.
Watermark Management:
Facebook
Twitter