Mappr is a free iPhone app that allows users to easily add or update the location of their photos before posting them on Instagram. Unlike other apps that only change the location in your photo library, Mappr actually saves the location inside the photo, filling in the GPS Exif fields.

With Mappr, you can select any photo from your library or use the camera to snap new photos. Adding a new location or changing an existing one is as simple as tapping a button. You can even add a location from an address, city, or country. The app provides a preview of the photo you are editing and allows you to open the updated photo directly in Instagram or save it to your library without opening Instagram.

One of the standout features of Mappr is its ability to fake the location of a photo. Instagram only shows the location embedded in the photo, so if there's no location data, you can only assign your current location. However, with Mappr, you can choose any location in the world for your photo and immediately open it in Instagram. The new location will be visible on your Instagram Photo Map, allowing you to show off your travels without actually going anywhere.

Whether you want to add a new location to your photo or fake your location for fun, Mappr is a user-friendly and convenient tool for Instagram users.