What is the recommended size when uploading a postcard design?

It depends on the postcard size you have selected. 

A6

• Full Bleed Size: 151 x 108 mm
• Document Trim Size: 148 x 105 mm
• Safety Area: 145 x 102 mm

A5

• Full Bleed Size: 213 x 151 mm
• Document Trim Size: 210 x 148 mm
• Safety Area: 207 x 145 mm

DL

• Full Bleed Size: 102 x 213 mm
• Document Trim Size: 99 x 210 mm
• Safety Area: 96 x 207 mm

Square

• Full Bleed Size: 154 x 154 mm
• Document Trim Size: 148 x 148 mm
• Safety Area: 142 x 142 mm

 

Tip: To avoid white edges, extend your design to the full bleed size — but keep text and images within the safety area.