Back to blog
EXIF6 min readSeptember 10, 2026

What a photo really reveals about you

GPS position, camera serial number, software history — a tour through the metadata of a typical smartphone photo.

A photo is never just pixels. Every time you press the shutter, your camera or phone writes a second layer into the file: metadata. It records where you were, which device you used and how the image was edited — and sometimes considerably more.

The layers inside a photo

Most photos from phones and cameras are JPEG files with several metadata blocks:

  • EXIF — the technical heart. Camera make and model, lens, exposure settings, timestamps, orientation, and often a GPS position with altitude.
  • XMP — an XML-based format used by editors such as Lightroom or Photoshop. It stores editing history, ratings, keywords and sometimes a copy of the GPS coordinates.
  • IPTC — classic press metadata: byline, copyright notice, captions, city and country.
  • Embedded thumbnails — small previews that can survive heavy editing and still show the original scene.
Fig. 01JPEG container layout
IMG_2026.jpg · byte stream
SOIFFD8
APP0JFIF
APP1Exif / GPS
APP1XMP
APP13IPTC
Image datacompressed pixels
EOIFFD9
A JPEG is a byte stream made up of marker-delimited segments. Metadata lives in the APPn segments in front of the actual image data — which is why it can be removed without touching a single pixel.Structure based on ISO/IEC 10918-1 (JPEG) and CIPA DC-008 (Exif)
Fig. 02Three overlapping metadata layers
EXIFbinary · TIFF-style IFDs
GPSLatitudeGPSLongitudeMakeModelBodySerialNumberDateTimeOriginal
XMPXML · Adobe & ISO
xmp:CreatorToolxmp:Ratingdc:subjectphotoshop:History
IPTCIMM · press metadata
By-lineCopyright NoticeCityCountry
The same file contains several metadata vocabularies at once. They overlap in content, but each stores different fields — so a cleaning tool has to handle all of them.Exif, XMP (ISO 16684-1) and IPTC IIM

Why it matters

Three examples from everyday life:

  1. You sell something online. A photo of your sofa, taken in your living room, contains the coordinates of your home. The buyer now knows your address before you ever meet.
  2. You apply for a job. The CV photo contains a camera serial number. It is a unique device fingerprint that can be linked to other photos you published elsewhere.
  3. You post a photo "from the office". The metadata shows a different location, a different time, and editing software that the original never had.

None of this is visible in the image itself. You only see it when you look at the metadata.

Fig. 03Where EXIF begins, in hex
offsethexannotation
0000FFD8FFE000104A464946000101000001....JFIF......SOI + JFIF
0010000100010000FFE112A2457869660000.........Exif..APP1 / EXIF
The first bytes of a JPEG read like a table of contents. The marker FFE1 marks the start of an APP1 segment, and the ASCII bytes 'Exif' confirm it is the metadata block — everything after it describes the photo, not the image data.Hex view of the JPEG marker sequence (ISO/IEC 10918-1)

What a typical report looks like

When ShredHub analyzes a photo, it groups the findings by risk:

  • Location — latitude, longitude, altitude, city names.
  • Device & hardware — make, model, lens, serial numbers.
  • Identity & authorship — artist, creator, owner, last modified by.
  • Software & edit history — editing tools, version numbers, revision counts.
  • Timestamps — capture, digitization and modification dates.
  • Embedded data — thumbnails, previews, sometimes trailing bytes after the end of the file.

Each field gets a risk rating, and the overall score tells you how exposed the file is.

Fig. 04From fields to a single score
78high · risk score / 100
0 · low35 · medium70 · high100
Risk is not a yes/no question. ShredHub weighs how many identifying fields are present and how directly they point to a person. A GPS fix and a device serial push the score into the red; generic capture timestamps alone stay low.

How to check your own photos

  1. Open the file in ShredHub (it runs entirely in your browser — nothing is uploaded).
  2. Read the report. If there is no location or identity group, you are already in good shape.
  3. Use the standard cleaning preset to remove identifying fields, or minimal if you only want to remove the GPS position and keep the camera details.
  4. Download the cleaned file and scan it again — ShredHub re-analyzes the result and shows a verified clean badge when the metadata is gone.

The takeaway

Metadata is not inherently bad. It is what makes photo libraries searchable and helps photographers prove authorship. The problem starts when files are passed to third parties without you knowing which data they carry. Checking takes seconds.