App to save image in dynamic format

I am developing mobile app. The purpose of this mobile app is to help its users generate a card to store their personal identification number, name and photo. The card comprises of a background layer and the following items which sits on top of background layer

• User Photo (image)
• Name
• Roll number

All the items are dynamic . The card will be uploaded to our server from the mobile device and can be pulled to various devices operated by the user. He can edit it anywhere.
I am looking for advices on a format which saves image as layers so that our editor can access the items on a card individually. Since this card is digitally passed around using 3G/4G data. The size of the file is also a consideration.

Thanks

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