Best iPad Photo Apps: A+ Signature Lite
With this app you can quickly add a watermark to photos, which is handy if you want to upload a photo to a website or Facebook directly from your iPad.
You can also create a signature by drawing on the iPad with your finger. To get a more diverse use out of the app, you can create greetings such as Happy Birthday.
With this free version of the app, you can only save images with a maximum resolution of 600 pixels – which should be fine for web use.