This FedEx label guide will walk you through label size and format options and other important FedEx label notes.
FedEx label sizes
Possible values for FedEx label sizes (actual results may vary):
- "4x6" (default)
- "8.5x11"
- "4X8"
- "4x9"
- "7X4.75"
- "8.5X11_BOTTOM_HALF_LABEL"
- "8.5X11_TOP_HALF_LABEL"
FedEx label formats
Possible values for FedEx label formats (actual results may vary):
- "PNG"
- "PDF" (Note: FedEx will only supply an 8.5x11 inch size label in PDF format)
- "ZPL"
- "EPL2"
FedEx label custom text options
FedEx has multiple options for printing custom text on their labels. For many users utilizing the following options will suffice for their needs:
- "print_custom_1"
- "invoice_number"
Basic JSON example
"options": {
"print_custom_1": "printCustom1",
"invoice_number": "INVOICE12345"
}
If you want to utilize more of the print_custom fields that FedEx has available then you have to utilize the print_custom_x_code options, with the appropriate FedEx codes to go with it. See Options
- "print_custom_1"
- "print_custom_2"
- "print_custom_3"
- "invoice_number"
These values will appear beneath the address on the FedEx label, as shown here:

Advanced JSON Example
"options": {
"print_custom_1": "printCustom1",
"print_custom_2": "printCustom2",
"print_custom_2_code": "PO",
"print_custom_3": "printCustom3",
"print_custom_3_code": "RMA",
"invoice_number": "INVOICE12345"
}
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