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Take a photo on any digital camera or smartphone and it's not just the pixels that are saved. The image also gets a bunch of metadata appended to it, also known as EXIF (Exchangeable Image File Format) data, including details of when it was taken, the device that was used to capture it, and the camera settings that were used.
If your phone or camera has a GPS chip and is tracking your location, then this gets invisibly stamped on to the photo as well. That's good if you want to look back at all the pictures you've ever taken in New York City or at Lizard Point, but not so good if you're sharing pictures of your pets and don't want to give away your home address at the same time.
Any time a photo goes beyond the audience of just you, it’s important to think about the metadata attached to it—and if needed, you should delete the location stamp.
How to View Photo Metadata
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A location-stamped photo in Google Photos on Android.
Photograph: David Nield
Photo metadata can be useful in a whole host of ways, and that includes the location tags. For example, both Google Photos and Apple Photos can sort your photo library based on where pictures were taken. Just try running a search in either of these apps for a place you've visited recently to see the results.
There are several ways to see the metadata stored with a photo. In Google Photos for Android, tap on a picture to open it, then tap the three dots (top right) and choose About. If location information is attached, you'll see the photo placed on a map. With Google Photos on the web, once you've opened an image you can see the same metadata by clicking the info button (the small "i" in a circle) in the top right corner.
Over on iOS you can use Apple Photos to find photo metadata by opening up an image, then tapping on the info button (the small encircled "i") down at the bottom. Again, your photo will be shown on a miniature map, if there's location information attached. If you're using Apple Photos on the web, double-click on an image to open it, and the info button is up in the top right corner.
This data can be found in Windows and macOS too, though you just get the GPS coordinates rather than a nicely formatted map. On Windows, right-click on an image in File Explorer, choose Properties, and then open the Details tab; on macOS, right-click on an image in Finder, pick Get Info, and if there are GPS coordinates attached then you'll see them in the pop-up dialog.