What is the recommended size when uploading a postcard design?

It depends on the postcard size you have selected. 

A6

• Full Bleed Size: 5.94" x 4.25" (151 x 108 mm)
• Document Trim Size: 5.83" x 4.13" (148 x 105 mm)
• Safety Area: 5.71" x 4.02" (145 x 102 mm)

A5

• Full Bleed Size: 8.39" x 5.94" (213 x 151 mm)
• Document Trim Size: 8.27" x 5.83" (210 x 148 mm)
• Safety Area: 8.15" x 5.71" (207 x 145 mm)

DL

• Full Bleed Size: 4.02" x 8.39" (102 x 213 mm)
• Document Trim Size: 3.9" x 8.27" (99 x 210 mm)
• Safety Area: 3.78" x 8.15" (96 x 207 mm)

Square

• Full Bleed Size: 6.06" x 6.06" (154 x 154 mm)
• Document Trim Size: 5.83" x 5.83" (148 x 148 mm)
• Safety Area: 5.59" x 5.59" (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.