A single photo from your phone carries far more than the picture you see. It records when it was taken, on what device, and often exactly where you were standing. This hidden data is called EXIF metadata.
Most of the time it is helpful. Your gallery sorts itself by date and pins your shots on a map thanks to EXIF. But surprisingly few people realize that when you send a photo to someone or post it online, all of that information travels with it.
What EXIF actually contains
EXIF (Exchangeable Image File Format) is a bundle of data your camera writes automatically at the moment of capture. The most common fields include:
- Date and time — the exact moment the photo was taken
- GPS coordinates — latitude and longitude if location was on, i.e. your home or workplace
- Device info — the make and model of the camera or phone
- Capture settings — focal length, shutter speed, ISO, whether the flash fired
- Orientation — how the image should be rotated
Why it becomes a privacy risk
The most sensitive field is the GPS coordinate. Post a photo of your pet or child taken at home straight to social media, and those coordinates can reveal your home address. People selling items online have exposed their neighborhood with a single listing photo.
Timestamps matter too. Combine the times across several photos and it is not hard to reconstruct someone's daily routine and movements. Once that information is public, it is extremely hard to take back.
How converting and re-saving strips metadata
Fortunately, EXIF is stored separately from the image pixels. That means re-encoding an image often drops this extra data along the way. When a browser draws your photo onto a Canvas and exports it as a new file, only the visible pixels are written again; the original GPS and capture details do not make it into the new file.
In other words, compressing to save space, resizing to change dimensions, or converting the format all remove personal metadata as a side effect. Saving as PNG even bakes the rotation (Orientation) into the pixels, so display quirks get cleaned up too.
Make checking a habit before you post
To be fully safe, build the habit of checking before you share. On a computer, open the file's properties (info) window and look under the details tab for GPS and date fields. On a phone, open the photo's info and see whether a map appears. If a location shows up, that photo still carries coordinates.
The surest approach is to make a separate copy for sharing. Re-save the photo with Switching's image compression or resize tool, and because everything is processed inside your browser and never uploaded to a server, you get a clean copy with the EXIF location and timestamp stripped away. For any sensitive photo, share that copy instead of the original.