Please what is the best size for a Birthday card invitation?

Please, I'm going to design an Invitation Birthday card for my friend





But I don't know the best size (In CM or Inches)





Can help me? please, necessary





thanks

Please what is the best size for a Birthday card invitation?
For just a birthday invitation, unless you want to get really into details and such, I'd keep it little, like a 4.25 x 5.5 inch design.


That's a quarterfold on a regular 8.5 x 11 sheet of paper.





Postcard size would also be a good option, I think that's like a 4x6(inches) or so.





For my graduation invites I used 5.5 x 8.5 inch cards, half-sheet, and they turned out pretty nice, but smaller wouldn't have really hurt anything.
Reply:a 6 inch invintation!

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