I've tested a variety of ways to add watermarks to my mobile photos, but Tagg.ly is the easiest. And the iOS app is free.

Your options include a single text field (I added my name and URL), timestamp, location, and logo. The text information is elegantly placed in the lower left corner. The logo, if you choose to add it, goes in the upper right. I found it a bit intrusive for my tastes. But I like the text placement.

Tagg.ly doesn't rely on metadata. It's part of the image. So unless someone intentionally crops it out, your name won't be accidentally stripped from the photo by a rogue app.

You can use the app's built-in camera function. But I prefer to shoot with my regular camera app, then open Tagg.ly to apply the watermark to images I plan to share. Since it taps your Camera Roll, it's easy to pull up a shot, tag it, then have the new version saved to your iPhone or iPad (Yes, it works with the iPad too).

And since the text field is so easy to change, you could use this app for adding captions to photos before publishing them. So, even though it's quite simple, it's very handy. And I anticipate that will see more features in future versions. I think it's terrific.

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