What postcard size fits inside a 6x9 envelope?

For a 6" x 9" envelope, pick a postcard a touch smaller so it slides in without forcing. Leaving a little clearance on each side keeps the card from binding or bending at the mouth of the envelope.

• Rule of thumb: stay roughly a quarter inch smaller than the envelope on each dimension
• Standard sizes: check the postcards calculator for the stock sizes available
• Exact fit: use the custom-size option to match your envelope precisely
• Not sure: contact support and we will confirm the fit before you order