At least 600×750 px photos

Several documents share a size and still disagree about background, head height, glasses, and file limits. Pick the document, not just the rectangle.

• UK visa photo, 600×750

  A UK visa or immigration photo is a JPEG at least 600×750 pixels, between 50 KB and 6 MB. UKVI crops the head for you. This is not the same picture as the one in your passport.