Before you post a photo: what it can reveal
Location data, camera serial numbers, capture times, text in the background, reflections. What a photo can give away, how to clean it before you share it, and what Kenveil Post does on your PC.
On this page
A photo carries two layers of information. One is hidden inside the file: where and when it was taken, and with what. The other is in plain sight: everything the camera caught, including things you did not notice at the time. Both can say more than you meant to share.
The good news is that both layers are easy to check once you know where to look.
Inside the file
Invisible, until someone opens the file’s details
- GPS position
- Camera make, model and serial number
- Capture date and time
- Author and copyright
- Software and editing history
- An embedded preview image
In the picture
Visible to anyone who looks closely
- Text: addresses, signs, badges, licence plates
- Screens with chats, mail or account names
- QR codes and barcodes
- Faces, yours and other people’s
- Reflections in windows, mirrors and glasses
- The view: landmarks and skylines
The hidden layer: what the file records
Most cameras and phones save information alongside the picture, in formats called EXIF and XMP. You rarely see it, but anyone who has the original file can.
Location
If location tagging is on, your phone can save the exact coordinates where each photo was taken. A picture taken at home can carry the position of your home to within a few metres.
Many large platforms remove this data from the copy they show, but you cannot always tell which ones do, and files shared as attachments, through cloud links, on forums or on marketplaces often keep everything. A platform that strips location from the public copy may still keep it for itself.
Camera details and serial numbers
Files can name the camera’s make and model, and dedicated cameras often record their serial number too. A serial number links every photo taken with that camera, even across accounts that have nothing else in common.
Time
The capture time is usually recorded to the second, sometimes with a time zone. It can reveal routines, show that a photo was not taken when you implied, or hint at where you live.
Author, software and editing history
Cameras and editing apps can write your name into author and copyright fields, and editing software can leave a history of what was done to the file and which programs touched it. Some files also carry a small preview image that is not always updated when you crop the photo.
The visible layer: what the picture shows
Metadata is the part people have heard of. The picture itself is often more revealing.
- Text. House numbers, street signs, parcels and letters with your address, name badges, school or work logos, licence plates, whiteboards and calendars.
- Screens. A monitor or phone in the background can show open chats, email, notifications or account names.
- QR codes and barcodes. A code on a ticket, boarding pass or parcel label can hold your name, a booking reference or a tracking number.
- Faces. Your own, and those of people who never agreed to be in your post, including children.
- Reflections. Mirrors, windows, sunglasses and glossy screens can show you, your room or what is on your monitor.
- The view. A skyline, a distinctive building or the view from your window can place you as surely as coordinates can.
A single photo rarely gives everything away. A series can: the same café at the same time every week tells a story that no single picture does.
Screenshots are photos too
A screenshot has no GPS position or camera serial number, but it often shows more than a photo does: the time in the status bar, notification previews, open tabs, the names of other people in a chat, and your own account name tucked into a corner of the window. Before you share one, crop it to the part that matters and check the edges, where notifications and user names tend to sit. The same goes for screen recordings and clips, which capture every notification that arrives while they record.
How to clean a photo before you post
- Turn off location tagging in your camera settings if you do not need it. Photos you have already taken keep their coordinates, so still check older ones.
- Remove metadata from the copy you share. On Windows, open the file’s Properties and, under Details, choose to remove properties and personal information. It clears many fields, though not always all of them. Re-saving in an editor does not reliably remove them either.
- Crop out what you can. Cropping is the most reliable way to take something out of a picture.
- Cover what you cannot crop, properly. Use an opaque box. A light blur, a swirl or a fine pixelation can sometimes be reversed or read, and highlighter-style markers are often see-through: raising the brightness can make the text underneath readable again.
- Check the result at full size. Zoom into the edges and any reflections, and look at the cleaned copy’s details before you upload it.
- Keep the original private, and share only the cleaned copy.
- Think about timing. Posting holiday photos once you are home, rather than live, gives away much less.
Deleting later is not the same as never posting
Once a photo is online, others can save, screenshot or repost it. Removing it later helps, but it cannot recall copies you do not control.
What Kenveil Post does, on your PC
Post runs these checks for you without uploading anything. Drop in a JPG, PNG, WebP, GIF or BMP, up to 40 MB and 12,000 pixels on a side, and it shows what the file gives away:
- Metadata: GPS position, camera make, model and serial number, capture time, author and copyright, software and editing history.
- QR codes in the picture.
- Readable text, using the text recognition built into Windows: email addresses, phone numbers, IBANs, web addresses, @handles, possible licence plates, and words that suggest a private screen is in the shot, in English and German.
- Faces, using the face detection built into Windows. It finds faces; it does not recognise who they belong to.
You choose what to blur, and Post saves a clean copy as a JPEG or a PNG. The copy is rebuilt from the pixels, so none of the original metadata survives, and its blur pixelates an area before softening it, so the detail underneath is gone rather than hidden. Your original file is never changed.
Its limits
Post is a second pair of eyes, not a guarantee. Its text checks need a text recognition language installed in Windows, and they can miss text that is angled, handwritten or low in contrast. Post does not judge context either, so a landmark, a view or a reflection will not be flagged. Look at the full-size picture yourself before you share it, and remember that anything you post can be copied.