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 desire to print 4x6 it only works on ZPL unless you reach out to Support to enable 4x6 for PNG. 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 - Please view this article.
- 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
If you desire to adjust the label type and size you can use the label_format and label_size options. See the example below on how to utilize this:
"options": { "label_format": "PDF",
"label_size": "4x6" }