Shippo

1. Go to Settings → Labels (apps.goshippo.com/settings/labels).
2. Set Default label format to 4 × 6 in PDF and save at the bottom of the page.

Notes

• Only labels created after the change use the new format; Shippo doesn't convert existing labels.
• International UPS labels can't be created at 4 × 6 because of the attached commercial invoice (other carriers create invoices separately).

References: Update label settings · Reprint labels