Originally Posted by
DCJoe1
The space for the picture on the Navigo card is actually a bit smaller than a 2x2 (inches) US passport photo. The size for the picture on the Navigo card is 3cm x 2.5 cm, or about 1.2x1.0 (inches). I figured out my drivers license picture is almost exactly that size. So I just copied that and cut out the photo, and brought it with me to paste onto the Navigo card. Saved me 5 euros for the photo at the station, and a couple of minutes.
You could also scan your passport photo and resize it to 3x2.5 cm using a site like this.
https://picresize.com/
You're right that it is a little smaller than a US Passport size photo. Only used passport photo as an easy to get format for an American traveling to Paris. They will take a passport photo, trimmed a little to fit, if that's what you provide them at the booth. Can't go wrong with either way to save the 5 euros.