Postcard Sizes Explained: Which One to Choose
By T.F.D. Thread For Days | Welcome | Published: 2026-10-17
Category: Buying Guides
Not sure which postcard size to pick? This guide breaks down standard postcard dimensions, including 4x6, and gives clear rules for choosing the right size for mailing, framing, or collecting.
Quick answer
For most mailing and display purposes, a 4x6 postcard is the safest and most versatile choice. It fits standard postcard rates, works with common frames, and gives you enough room for a clear message. If you're framing or sending internationally, check size limits before you commit.
Standard postcard dimensions you should know
Postcards come in a few common sizes, but the most widely used is 4 x 6 inches. This size is popular because it meets the USPS minimum size for mailing at the standard postcard rate, which is 3.5 x 5 inches. Anything smaller may be charged as a letter. The 4x6 size also fits most standard frames and sleeves, making it a practical choice for both sending and displaying.
Another common size is 5 x 7 inches. This gives you more space for artwork and writing, but it may not qualify for the lower postcard postage rate in some countries. If you're planning to mail a 5x7, check your postal service's size rules first. For collecting or swapping, some people prefer the classic 3.5 x 5 inch size, but it can feel cramped for detailed designs.
How to choose the right postcard size for your purpose
Your choice should depend on what you plan to do with the postcard. For mailing, stick to 4x6 to keep postage costs low and avoid extra fees. For framing, measure your frame's opening first; a 4x6 fits standard frames, while 5x7 requires a larger frame. For collecting, consider storage—many collectors use sleeves designed for 4x6, so that size is easier to organize.
If you're sending a postcard as a gift or a note, think about how much you want to write. A 4x6 gives you a decent message area, but if you love writing long notes, a 5x7 might feel better. Just remember the trade-off: larger sizes cost more to mail and may not fit standard frames.
Decision rules for choosing a postcard size
- Mailing a postcard: Choose 4x6 to stay within standard postcard size limits and avoid letter postage rates. If you pick a larger size, verify your postal service's rules first. 4x6 is the safest mailing choice.
- Framing or displaying: Measure your frame before buying. 4x6 fits standard frames, while 5x7 requires a larger frame. If you plan to frame, match the postcard size to the frame opening. Check your frame size first.
- Writing space: If you like writing long messages, a 5x7 gives more room, but it may cost more to mail. For short notes, 4x6 is enough and keeps postage low. Balance message length with postage cost.
Postcards that fit the 4x6 standard
- Garlic Ghoul | Postcard: This 4 x 6 double sided postcard is printed on durable 4 x 6 matte 110lb heavyweight cardstock paper. The 4x6 size means it qualifies for standard postcard postage and fits common frames, so you can mail it easily or display it without special mounting.
- Let's Hang | 4 x 6 Postcard: This 4 x 6 double sided postcard is printed on durable 4 x 6 matte 110lb heavyweight cardstock paper. Heavyweight cardstock gives a sturdy feel that survives the mail, and the double-sided print gives you extra design space without changing the size.
Which size fits your needs?
Best for
- People who plan to mail postcards regularly and want low postage costs
- Collectors who use standard 4x6 sleeves or albums
Not for
- Anyone who needs a large writing area and is willing to pay higher postage
- Those framing in a specific 5x7 frame without checking the size first
