What file format should I use for variable data like numbering?

Variable data such as sequential numbering should be supplied as a spreadsheet so each piece can be assigned its own value accurately.

• Submit the numbering or variable data in Excel format (.xls or .xlsx).
• List the values in a single, clearly labeled column.
• Note the starting number and any prefix or leading zeros you need preserved.

Keeping the data structured in a spreadsheet lets each unique number map cleanly to the right printed piece.