Independent mail-format guide

About EnvelopeFormat

EnvelopeFormat turns public postal guidance into a visual answer you can use while a blank envelope is sitting in front of you.

Why we built it

Addressing a letter is simple once you can see the layout. Long instructions often make a one-minute task feel harder than it is, so we focus on one clear diagram, practical examples, and a printable placement guide.

How we review information

Our US guidance is checked against publicly available USPS resources, including its letter-mailing instructions and Publication 28. Pages show their review date so you can judge how current they are.

What we are not

EnvelopeFormat is an independent educational website. We are not affiliated with or endorsed by the United States Postal Service, and our preview does not validate addresses or calculate postage.

Corrections

Postal rules change and details can be nuanced. If you find something that needs correction, please contact us with the page and the official source.