One task, start to finish.
What the requirement actually is, then the steps. Anything quoting an official rule carries its source.
US passport photo size: 2×2 inches, and how to print one yourself
The State Department asks for a 2×2 inch photo with the head between 1 and 1.4 inches, taken in the last six months. Here are the numbers, the limits for an online renewal, and how to get it onto photo paper.
ID photos · about 4 minHow to compress a photo to a KB limit without wrecking it
Application forms cap the file size, sometimes at 50 KB. The order matters: fix the pixel size first, then compress, and only then argue with the quality slider.
Images · about 4 minHEIC to JPG: why iPhone photos will not open, and three ways to fix it
Since iOS 11 the iPhone camera saves HEIC by default. Here is how to convert the photos you already have, and how to stop the problem at the source.
Images · about 3 minPrinting passport photos: at home, or from a photo print service
The photo is the right size on screen and the wrong size on paper, because something scaled it. Here is how many fit on a 4×6 sheet, and which file each kind of printer wants.
ID photos · about 4 minPutting a logo on a QR code without breaking it
A QR code survives a logo because it was built to survive damage — but only so much. What matters is the quiet zone, the contrast, and how much you asked it to carry.
QR codes · about 4 min