This chart contains most of the global postal authorities postcard and letter envelope dimensions. Use these size restrictions as guidelines when creating postcards, greeting cards, envelopes or other web-to-print templates.

Global postal authorities
Postal authority (Country)	International postcard and letter dimensions
Australia post (Australia)	Min	138 mm x 88 mm
	Max	240 mm x 130 mm
	Letters max size	240 mm x 130 mm
Post Austria (Austria)	Min	140 mm x 90 mm
	Max	353 mm x 250 mm
	Letters max size	length + width + depth = 900 mm, but a maximum length of 500 mm
Canada Post (Canada)	Min	140 mm x 90 mm
	Max	120 mm x 235 mm
	Letters max size	150 mm x 245 mm
Hrvatska Posta (Croatia)	Min	90 mm x 140 mm
	Max	120 mm x 235 mm
	Letters max size	120 mm x 235 mm
Cyprus Postal Services (Cyprus)	Min	120 mm x 235 mm
	Max	120 mm x 235 mm
Czech Post (Czech Republic)	Min	140 mm x 90 mm
	Max sum of all three dimensions	900 mm
Post Denmark (Denmark)	Min	140 mm x 90 mm
	Max	Length 60 cm length + width + thickness = 90 cm
Egypt Post (Egypt)	Min	140 mm x 90 mm
	Max length	600 mm
Posti (Finland)	Min	90 mm x 140 mm
	Max	125 mm x 230 mm
	Letters max size	250mm x 400mm x 30mm
Deutsche Post (Germany)	Min	140 mm x 90 mm
	Max	235 mm x 125mm
	Letters max size	235 mm x 125mm
Magyar Posta (Hungary)	Min	90 mm x 140 mm
	Max	length + width + depth = 900 mm, but a maximum length of 600 mm
India Post (India)	Postcard size	140 mm x 90 mm
	Min letter (Any single dimension)	110 mm x 70 mm
	Max letter (Length + Breadth)/ Height	900 mm
An Post (Ireland)	Min	140 mm x 90 mm
	Max	235 mm x 162 mm
Japan Post (Japan)	Min	140 mm x 90 mm
	Max	235 mm x 120 mm
	Max greeting card size	Length (600mm) + Width + Thickness = 900 mm
Jordan Post (Jordan)	Letters & Printed Matters	Length (600mm) + Width + Thickness = 900 mm
Pos Malaysia (Malaysia)	Min	140 mm x 90 mm
	Max	148 mm x 105 mm
	Letters max size	165 mm x 250 mm
New Zealand Post (New Zealand)	Min	138 mm x 88 mm
	Max	235 mm x 165 mm
	Large letter size	235 mm x 165 mm
Q-Post (Qatar)	Letter max size	Length (600mm) + Width + Thickness = 900 mm
Russian post (Russia)	Min	90 mm x 140 mm
	Max	120 mm x 235 mm
	Standard letter sizes	110 mm x 220 mm 114 mm x 162 mm
South African Postal Service (South Africa)	Postcard size	120 mm x 235 mm
	Small letter	120 mm x 235 mm
	Medium letter	250 mm x 176 mm
Sri Lanka Post (Sri Lanka)	Min	130 mm x 90 mm
	Max	150 mm x 110 mm
	Letter min size	114 mm x 81 mm
	Letter max size	162 mm x 89 mm
Swiss Post (Switzerland)	Standard letter size	250 mm x 176 mm
PTT (Turkey)	Min postcard size	90 mm x 140 mm
	Max postcard size	105 mm x 148 mm
	Letters max size	Length (600mm) + Width + Thickness = 900 mm
Emirates Post (UAE)	Min	90 mm x 140 mm
	Max	120 mm x 235 mm
	Letters max size	Length (700mm) + Width + Thickness = 900 mm
Royal Mail (UK)	Postcard and letter max size	165 mm x 240 mm
USPS (USA)	Min postcard size	127mm x 88,9mm (5″ x 3,5″)
	Max postcard size	292,1mm x 155,575mm (11,5″ x 6,125″)
	Letters max size	292,1mm x 155,575mm (11,5″ x 6,125″)