A photograph contains more than you put into it. Some of the data sits inside the file, some found its way into the frame by accident, and together they tell people things you did not set out to tell them.
What sits inside the file
A photo from a phone carries technical data: the device model, the date and time to the second, the camera settings and — most importantly — the coordinates of the place, if geotagging is on.
That is enough to identify an entrance, not merely a building. Social networks usually strip this data on upload, but a file sent “as a document” or by email arrives untouched.
What ends up in the frame
| What | How it gives you away |
|---|---|
| Reflections | A house number in a window, the photographer's face in a mirror, a screen in glasses |
| Documents on the table | A passport or card number is readable even partially |
| Device screens | An open conversation, a file list, an address in a browser |
| Keys in hand | A duplicate can be cut from a photograph of a key |
| A boarding pass | The barcode contains the booking reference and passenger data |
| The view from a window | A recognisable landmark identifies the building down to the entrance |
| School uniform and logos | They point to a specific place a child attends every day |
What to check before posting
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Turn off geotagging in the camera
A one-off setting. If you want coordinates for your personal archive, keep them — but check what leaves the device.
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Look at the background, not the subject
A second of attention to what is behind: papers, a screen, the view from the window.
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Zoom into the suspicious parts
Reflections and small print read better than they appear in a thumbnail.
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Do not post documents or tickets
Not even with fields blacked out: painting over an image is often reversible, and a barcode carries the data regardless of the text beside it.
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Check other people's photos of you
Tags in the photos of friends with open profiles are visible to everyone, even when yours is private — more on that.
A note about children
- Uniform and school badges point to a specific school.
- Regular posts from one place add up to a daily routine.
- A name in the caption together with the uniform gives a stranger enough to approach a child as though they were known.
What to explain to children about their own posts, and when, is covered in passwords for children.