How Do I Print a Photo Small Enough for a Locket?
Measure a locket insert and print a few small photo sizes on a single test sheet.
What size should I print?
Remove the insert or clear cover if it is designed to come out, then measure its widest and tallest points in millimeters. Use those measurements as your starting size. For an oval or heart, the width and height describe the rectangle you will cut the shape from.
How do I keep the face inside the shape?
Center the face and leave extra space around the head. Trace the insert on a scrap of paper, cut out the center, and lay the opening over your test print. A face that fits in the rectangle may still be clipped by the curved edges.
How do I test the fit without wasting photo paper?
Make a sheet with your measured size and one slightly larger version for trimming. Print on plain paper at Actual Size, trace the insert, and test the fit. Once you have the crop and size you want, print the same layout on compatible photo paper.