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EXIF Viewer by

Resolution Unit

Whether X/Y Resolution are per inch or per centimetre.

EXIF tag ID
0x0128
Group
Image
Example
inches · cm
Editable in EXIF Viewer
Yes

What iPhone writes

inches.

What dedicated cameras write

Almost always inches.

How to view Resolution Unit on iPhone

Open the photo in Photos, tap Share, then View EXIF (EXIF Viewer’s action extension). The field is listed under “Image”. Tap Edit to change it, or select several photos in the app to change them all at once. Or drop the photo into the free online EXIF viewer.

Related tags

  • X Resolution / Y Resolution (DPI) — The intended print density in pixels per Resolution Unit — what everyone calls the DPI. It's a label and does not affect the pixels.