Shipping Label Sizes

Nearly all carriers handle the 4x6 shipping label size. However, some of the carriers have extra label sizes you can also use to your benefit.

Here are the labels sizes that may be different:

• UPS results in a 4x7 if you don't override, but if you print it as 4x6 it's usually ok since the last inch is just a blank space for notes anyway. If you ask for 4x7 or 4x8, you get a label back, but both are just a 4x6 with 1 or 2 inches of blank space.
• DHL Express supports the following label_sizes: 4x7, 8.5x11, 4x6 and 4x8
• USPS - Please see this article. 
• FedEx supports 4x6 and 4x8
• Lasership supports 4x6 and 4x8 supported only for ZPL format
• Ontrac supports 4x6 and 4x8 supported only for ZPL format format

With EasyPost, you can choose the best shipping label size for your parcels. You have the ability to select different label formats, and these each have a pre-set size to them if you do not override. If you specify a format without size, the result will vary somewhat. For example, if you specify PDF but not a size, you'll end up with a 4x6 label embedded in an 8.5x11 sized PDF.

Size By Type:

• 1. PDF: 8.5x11
• 2. EPL: 4x5
• 3. ZPL: 4x5
• 4. PNG: 4x6

To use the size type you can utilize the shipment option label_format. See example below:

"options": {
  "label_format": "PDF"
}