EXIF Metadata and Privacy: What a Conversion Removes and Keeps

What travels inside a photo file

EXIF is a block of labeled facts stored beside the pixels. In a JPEG it sits in a segment that cannot exceed 64 kilobytes. Typical contents are the camera or phone model, lens and exposure settings, the date and time of capture, a small preview thumbnail, the orientation flag, software that touched the file, copyright or author text, and, if location was on, GPS coordinates. Manufacturers add private notes too. Other formats can carry the same kind of data: HEIC does, and PNG and WebP have room for it.

Embedded color profiles live in the same neighborhood but do a different job; they are covered in color profiles and sRGB. Everything below concerns the descriptive data.

What each kind of tag can give away

The fields differ a lot in how much they reveal. This table is a general guide; which fields exist depends on the device and its settings.

Field	What it can reveal	Who it matters to
GPS coordinates	Where you stood, often to within a few meters	Anyone posting photos of home, school or work
Capture date and time	When you were there, and your routine if photos pile up	People sharing travel or daily photos
Device model, sometimes a serial number	What gear you own; a serial can link two photos to one camera	Sellers, whistleblowers, owners of expensive gear
Embedded thumbnail	A preview that some editors leave unchanged after a crop, so the uncropped scene can survive	Anyone who crops to hide something
Author and copyright text	Your name or studio	Photographers, who may want it kept

What the converter does to it

Each image is re-created from its decoded pixels, which leaves out EXIF, GPS location, camera data and embedded color profiles. The picture's orientation is applied first, and the output is plain sRGB pixels with no profile. The page that does this runs inside your browser; how that works is in how browser-based image conversion works.

That makes conversion a quick way to strip location data, but the effect cuts both ways, so the next sections go through the cases.

Orientation: the one tag you cannot just throw away

Phones usually save the pixels in the sensor's landscape layout and add an orientation flag saying "show this rotated". I tested it with a synthetic 1920 x 1080 picture tagged with orientation 6 (rotate 90 degrees clockwise). Raw pixel dimensions: 1920 x 1080. As displayed after applying the tag: 1080 x 1920, a portrait picture.

A tool that simply deleted the tag without rotating the pixels would turn every portrait photo sideways. This converter applies the rotation first, then writes the result, so portrait photos stay portrait. A program that reports raw pixel dimensions will show 1920 x 1080 for the original and 1080 x 1920 for the converted copy; that is the rotation written into the pixels, not an error. The converter lists a pixel size only when the size changed, so it shows nothing extra for this.

Five situations, five different answers

• Selling something from home. Photos taken with location on can carry the coordinates of where you stand, which may be your front room. Strip before posting; a conversion does it for you. Many sites remove location from uploaded pictures themselves, but practices vary and change, and you will not see it happen, so do not rely on it.
• Sending a photo to a journalist, lawyer or support desk. Removing metadata hides the capture time and place, but not what the picture shows: a street sign, a reflection, a face, a license plate. Check the visible content as carefully as the tags.
• You are a photographer. The conversion also removes author and copyright fields and the capture settings. Put the credit in a caption, the page text or a visible watermark instead, and remember that metadata was never a legal protection to begin with; it only tells people whom to ask.
• Family albums and archives. Photo apps sort by the capture date stored in EXIF. A converted copy has none, so it falls back to the file's creation date, which is the moment you converted it, and the picture jumps to the wrong place in the timeline. For anything you want sorted by when it was taken, convert only copies that you are happy to date by hand, or leave those files alone.
• Bulk-converted files with names. The file name survives conversion, with the new extension, so a name like "john-smith-passport.jpg" still tells the story that you just removed from the tags.

Checking what your own file carries

You do not have to guess. These routes usually exist, though menu labels vary by version:

1. Windows. Right-click the file, choose Properties, open the Details tab. Camera, date and GPS rows appear if present; a link near the bottom of the tab usually offers to remove properties and personal information.
2. Mac. Open the file in Preview and choose Tools, then Show Inspector; the Exif and GPS tabs show what is stored.
3. iPhone and iPad. Open the photo in Photos and view its info panel; a map appears if a location is stored. Sharing options generally let you leave location out at the time you share.
4. Compare. Convert one photo, then inspect the original and the converted file the same way. The converted file should show no camera and no GPS entries.

What conversion does not remove

Metadata removal does not make a picture anonymous. It does not touch faces, text on screens, house numbers, landmarks or anything else visible in the frame. It does not change the file name. It does not undo the earlier copies: if the original with its GPS tags is already on a cloud drive or in a message, it stays there. And it cannot alter what a recipient already received.

Size is hardly affected, too. Basic tags are tiny: when I added a camera name and an orientation flag to a test JPEG, the file grew by 56 bytes. Real phone files carry more, including a thumbnail and manufacturer notes, up to the 64-kilobyte ceiling, which is small next to a multi-megabyte photo. Do not expect metadata removal to shrink a file noticeably; for that, see why a converted image can get bigger for what really drives size.

Deciding whether to strip

Strip location when the audience is unknown and the place is private: marketplaces, forums, public posts, anything about your home, children or workplace. Keep the original tags when the data is the point: evidence, archives, a photographer's own records, insurance claims where capture time matters. The same file can serve both, because conversion creates a new copy beside the original rather than changing it; the good habit around that is covered in common image conversion mistakes.