What Is EXIF? The Data Hidden in Every Photo You Take

Every photo your phone or camera produces carries a block of data describing how it was made. It is called EXIF — Exchangeable Image File Format — and it travels inside the JPEG or HEIC file itself, invisible unless you go looking.

Most of it is genuinely useful. One part of it is a privacy problem that people share publicly without realising.

What Is Actually in There

• Date and time, to the second, usually with the time zone.
• GPS coordinates — latitude, longitude, often altitude and compass direction.
• Camera make and model, and on many cameras the serial number of the body and lens.
• Exposure settings: shutter speed, aperture, ISO, focal length, whether the flash fired.
• Orientation — which way up the camera was held.
• Colour profile, software used, and on edited files a record of what edited it.
• On phones, often a thumbnail of the original image.

Two of those deserve their own sections, because they cause real problems in opposite directions.

Orientation: the Field That Rotates Your Photos

Cameras do not physically rotate the image when you turn them sideways. They record the picture as the sensor saw it and write an orientation tag saying “display this rotated 90 degrees”.

Software that reads the tag shows the photo correctly. Software that ignores it shows the original sensor orientation — which is why a photo that looked fine on your phone arrives sideways somewhere else. The image data is identical; only the instruction was dropped.

GPS: the Part to Think About

If location services are enabled for the camera, every photo records where it was taken to within a few metres.

For your own library this is excellent — it is what lets you search photos by place and see them on a map. The problem is what happens when the file leaves your control.

A photo posted with its GPS intact tells anyone who looks exactly where you were and when. A set of photos tells them where you live, where your children go to school, and when you are away from home. This is not hypothetical; it is the ordinary consequence of sharing an unmodified camera file.

The practical position worth knowing:

• Major social platforms strip EXIF when you upload. They keep the data for themselves, but the file other users download usually has no GPS.
• Direct sharing does not strip anything. Email attachments, messaging apps that send “as a file” or “original quality”, cloud links, and anything you upload to your own website keep the full EXIF.
• Selling or listing items online is the common accident. A photo of a product taken at home, uploaded to a marketplace that does not strip metadata, publishes your address.

If you are unsure what a file contains, read its information before sending it. It takes a moment and the answer is unambiguous.

Removing It — and What Else Goes

Stripping metadata is straightforward, and there is one thing to be careful about.

A blanket “remove all metadata” takes the colour profile with everything else. That profile is what tells software whether the numbers in the file mean sRGB or Display P3 — and without it, a photo from a modern phone is rendered oversaturated by anything that assumes sRGB.

So the useful instruction is: remove GPS, camera identifiers and timestamps; keep the colour profile and the orientation tag. Most tools that offer metadata removal for the web do exactly this by default. Tools that offer a single aggressive switch often do not.

The other common surprise: on some files, editing software leaves the original thumbnail embedded in the EXIF. Crop a photo, and the small preview inside it may still show the uncropped original. Re-saving through a tool that regenerates the thumbnail removes this; simply cropping does not always.

When You Want to Keep It

EXIF is not something to delete reflexively. It is the only record of how a photograph was made.

• Learning photography depends on it — you cannot review why an image worked without the shutter speed, aperture and ISO.
• Organising an archive relies on accurate timestamps; software sorts by EXIF date, not file date, which changes every time a file is copied.
• Proving provenance — insurance claims, documentation, journalism — rests on the capture metadata.
• Copyright fields exist in EXIF and can carry your name and licence terms with the file.

The sensible arrangement is to keep full EXIF on your originals and strip the sensitive fields only from the copies you publish. Deleting it from the master is irreversible, and nothing reconstructs it.

Which Formats Carry It

• JPEG and HEIC — full EXIF, the usual camera output.
• TIFF and RAW — full EXIF plus much more.
• WebP and AVIF — supported, though some converters drop it.
• PNG — uses different metadata chunks; EXIF support exists but is inconsistent, so a JPEG converted to PNG often arrives with nothing.
• Screenshots — no camera data, but they do carry a colour profile, and on phones a timestamp.

Quick Reference

• Metadata written into every camera photo: time, GPS, camera, settings, orientation
• The orientation tag is why photos arrive sideways when software ignores it
• GPS is accurate to a few metres and survives email, messaging and direct uploads
• Social platforms strip it; your own website and marketplaces often do not
• Check a file’s information before sharing it publicly
• When stripping, keep the colour profile — removing it breaks the colours
• A cropped photo may still contain an uncropped thumbnail
• Keep full EXIF on originals; strip only the copies you publish