Emma Davis Print Production Specialist at 4OVER4.COM
Emma is our prepress and print production voice, built from the knowledge of our production team, with over 20 years in printing.
Question
How do I make sure my envelopes are USPS compatible?
Answer
To qualify for standard USPS letter rates, an envelope has to stay inside a defined size and shape window. Miss it and the piece gets bumped to a higher rate or returned.
| Requirement | Spec |
|---|---|
| Minimum size | 3.5" x 5" |
| Maximum size | 6.125" x 11.5" |
| Maximum thickness | 1/4 inch |
| Aspect ratio | Between 1.3 and 2.5 |
| Shape | Rectangular |
- Keep the lower-right quadrant clear so the address and barcode print cleanly.
- Square or oddly shaped envelopes usually require extra postage.
- Rigid or lumpy contents can push you past the 1/4 inch thickness limit.
Design to these numbers from the start and your mail moves at the lowest rate without surprises.
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