There are plenty of apps that purport to scan your photos, but few do the job as well as Google's Photo Scan. The free app, available for Android and iPhone users, guides users through the process to get a perfect scan by taking a snapshot with your phone camera.

The app is very simple to use. When you go to scan a photo, the app will direct you to capture the four corners, denoted by white circles. The app also uses your phone's flashlight, but don't worry about the glare. The app is able to resolve it automatically.

Testing the app on the iPhone 6 Plus with a 30-year-old curled photo in low light, the resulting scanned photo was pretty impressive. It appeared flat, as though scanned.

The app can be a little bit hit and miss. Sometimes you won't get a perfect "scan" on the first try. And while the quality wasn't always perfect, it isn't surprising given the scan was created with a phone camera. If you're scanning the photos for online use, Photo Scan will definitely meet your needs.

Another advantage to using this app to digitize your old photos is that you can save the photos in Google Photos. The online service allows you to tag, search, and share your photos. Google Photos also gives you unlimited storage of high-quality, but not original quality, photos.

How do you back up your old photos? Let us know in the comments.