Issue the whole room.
Drop in a roster, attach a folder of photos, get every badge back as a zip with a manifest of the serials issued. Up to 500 at a time, and not one byte leaves this tab.
1Load the roster
Columns are matched by name, so exports from Devfolio, Google Forms or a spreadsheet usually import without editing. Add a photo column with filenames, then select all the photos at once and they pair up automatically. Up to 500 rows.