What Is EXIF Data and What Does It Reveal About Your Photos

Open a photo from your phone in a metadata viewer and you'll find a lot more than the picture. There's the exact phone model, which of its cameras was used, the exposure settings, the date and time to the second, and very often the GPS position where you were standing. This block of data is called EXIF, short for Exchangeable Image File Format, and your phone writes it into the file every time you take a picture.

It exists for good reasons. It's how your gallery sorts photos by date, turns them the right way up and puts them on a map. The trouble is that it travels with the file, and most people forget it's there.

What's in it

The fields vary from one device to another. On a typical phone photo you'll find the make and model, the lens, and the settings: ISO, aperture, shutter speed, focal length and whether the flash fired. Dedicated cameras sometimes add the serial number of the body or the lens.

Then there's the time. The capture date is recorded to the second, and recent phones also store the time-zone offset. It comes from the device's clock, so it's only as accurate as that clock.

Most sensitive of all is the location. Latitude, longitude, often altitude and sometimes the direction the camera was facing. On most phones it's saved by default as soon as the camera app has access to location.

The software field is worth a look too. When an image is exported from an editing app, the app's name often replaces the phone's system version. Some files also contain a small embedded preview. Older software didn't always update it after a crop, so in rare cases the preview still shows the full original frame.

Where it gets removed, and where it doesn't

The big social networks strip location data when you post. Instagram, Facebook and X do it, and so does WhatsApp when you send a photo the normal way. That's why most people assume their pictures are safe.

Plenty of routes keep everything, though. Email attachments, AirDrop, cloud storage links, files sent as a document on WhatsApp or as a file on Telegram, and images uploaded to forums or small websites that don't process them. A photo of your new flat sent to a landlord by email carries your address. So can a picture in a classified ad, depending on the site.

How to check a photo

You don't need special software for a quick look. On a Mac, open the image in Preview and press Cmd+I, then check the GPS tab if there is one. On Windows, right-click the file, choose Properties, then Details. On an iPhone, swipe up on a photo in the Photos app to see the date, the camera and a small map if a location was saved.

For every field, including the maker notes that manufacturers add, you need a dedicated metadata viewer, and there are good free ones. PixTrace also reads the full metadata in every analysis and turns GPS coordinates into an address.

How to remove it

On an iPhone, tap Options at the top of the share sheet and turn off Location before you send. On a Mac, Preview's inspector has a Remove Location Info button in the GPS tab. On Windows, the Details tab has a link called Remove Properties and Personal Information. We cover every platform, Android included, in our guide to removing the location from a photo.

Whatever you use, open the cleaned copy afterwards and make sure the GPS fields are really gone.

Why investigators look at it first, and trust it last

When you're checking a photo, metadata is the first thing to look at. Coordinates that match the claimed place are a good sign. A capture date months before the event it supposedly shows is a strong sign in the other direction. An editing app in the software field doesn't prove anything was faked, but it tells you the file went through an editor.

The catch is that EXIF is easy to change. Free tools can rewrite a date or add fake coordinates in seconds. So it's useful when it agrees with everything else in the picture, and a reason to look harder when it doesn't. Snow on the ground in a photo dated July, north of the equator, deserves a second look.

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