Best way to add custom watermarks?

I am a newbie creating a digital downloads marketplace for myself that would benefit from watermarks on images. I would like to place a custom watermark that I’ve made separately on top of product images within the website, as in the future I am planning on having other contributors to the site, and it seems smarter to have it built in to the site.

I tried a watermark plug-in but it didn’t really seem to work well. I know some paid galleries like Envira Gallery has watermark functionality built in.

Anybody has a working solution or can point to a good plug-in or product that works for them?

 

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