ICC Nametag Designer

Measure in

Add names

Paste from a spreadsheet, or type one name per line

or

Upload a spreadsheet

For Google Sheets, use File > Download > CSV.

Your list

Drop the spreadsheet to add its names

Drop an image to use as the background

Tips for the print window

Set Scale to 100% or Actual size. "Fit to page" changes the size of your tags.
Set Margins to None or Default. The spacing here already takes care of the edges.
If backgrounds come out white, turn on Background graphics under More settings.