What metadata is stored in your Mac photos (and how to clean it)

You take a photo, send it to a friend, and assume the only thing you’ve sent is the picture itself. Actually you’ve sent a small file full of metadata about when, where, and how the photo was taken — and sometimes who took it.

What’s actually in there

A typical JPEG or HEIC photo from a phone or modern camera contains several blocks of metadata:

• EXIF — capture date, GPS coordinates, camera make and model, lens, aperture, shutter speed, ISO, white balance, flash status, sometimes a serial number.
• IPTC — caption, keywords, copyright, creator name (mostly added by editing software).
• XMP — Adobe’s extensible metadata, often duplicates EXIF and IPTC.
• ICC — colour profile.
• Thumbnail — a small embedded preview of the image (sometimes the original image, even if you cropped — a real privacy concern in older tools).

How to view what’s in a photo

Preview’s Inspector. Open the photo, Tools → Show Inspector, click the (i) icon. Tabs cover General, EXIF, GPS, TIFF, IPTC.

Photos app. Select a photo, then Window → Info (or ⌘+I).

exiftool in Terminal. Most detailed:

brew install exiftool
exiftool photo.jpg

That dumps every tag in the file.

What to clean and when

• Sharing publicly (social, blog, public forum): strip everything. GPS in particular.
• Sharing with a known person: GPS is the main concern; the rest is usually fine.
• Archiving your own photos: keep everything — the metadata is genuinely useful for future-you.
• Selling or licensing: add IPTC copyright and creator info instead of removing.

The native way to clean

Preview, GPS only: Tools → Show Inspector → GPS tab → Remove Location Info.

exiftool, everything:

exiftool -all= -overwrite_original photo.jpg

exiftool, GPS only:

exiftool -gps:all= -overwrite_original photo.jpg

The faster way

Melt strips all metadata by default whenever it re-encodes an image. Drag photos in, set the output format (keep it the same to avoid quality loss), confirm “Strip metadata” is on, click Compress. Handles whole folders at once. Download Melt.

Clean metadata in Melt

1. Open Melt.
2. Drag photos in.
3. Confirm "Strip metadata" is enabled.
4. Match output format to source.
5. Click Compress.

What you lose, what you keep

Stripping metadata loses date/time, camera info, GPS, copyright, and embedded thumbnails. The image pixels are untouched. For most public sharing this is the right call. For personal libraries, it’s not — you’ll wish you had the dates later. The right move is to strip metadata only on the copy you’re sending, and keep your originals as they were.