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Envelope Size Guide

Not sure exactly what you’re looking for? The following is a list of common envelope uses, categorized by section and size. Certain envelopes serve different purposes, so let us help you find the exact one that fits your needs!

View or download our Envelope Size Guides!

Business Envelope Sizes  Invitation Envelope Sizes



#6 3/4, #7, #7 3/4

Small invoices
Personal checks
Small business reply

Shop Custom # 6 3/4 Envelopes



#8 5/8, #9

Return envelopes
Check mailing
Personal correspondence Newletters∙ Personal correspondence ∙ “Thank you” notes


Most common size of mailing envelope

Everyday mailings
Can hold smaller return envelopes

Shop Custom #10 Envelopes


#11, #12, #14

Holds #10 and smaller



6 x 9, 6 1/2 x 9 1/2, #6, #9 3/4

General mailings
Advertisements/Marketing Jumbo cards

Bubble-lined/Poly Bubble

Useful for mailing or storing fragile items that require extra protection

First Class Borders

Tyvek material keeps envelopes from tearing in transit

Large documents

Shop Custom 6x9 Envelopes


9 x 12, 10 x 13

∙ General mailings

Advertisements/Marketing Jumbo cards

Shop Custom 9x12 Envelopes

Shop Custom 10x13 Envelopes



This envelope’s ability to expand allows for it to fit larger quantities of documents, magazines, or brochures

∙ Bulky materials

Magazines & catalogs Important documents


Tyvek material keeps envelope from tearing in transit Great for bulky mailings you want to be sure will reach their destination safely


A1 Used for response/RSVP cards or “thank you” cards

reach their destination safely

A8 Popular size for holiday cards and other greeting cards

Great for holiday cards, party invites, announcements, & more

A9 Popular size for holiday cards and other greeting cards

Fits a 5 1/4” x 7 7/8” card

Fits a 5 1/2” x 8 1/2” card

A1 Fits a 3 1/2” x 5” card A2 A2 Holds a standard A2 card or other 4 1/2” x 5 1/2” card

A4 Used for birth announcements, photos, holiday cards, or “save the dates”

  1. A6  Used as an inside envelope for A7 wedding invites or smaller wedding invitations

  2. A7  Common wedding invitation envelope size

    Great for holiday cards, party invites, announcements, & more

Fits a 4” x 6” photo or card Fits 4 1/2” x 6 1/4” card
Fits 5” x 7” card


Can fit A8 or A7 inside

Good for oversized greeting cards or invites, personal correspondence

Used for multiple pieces of information mailed together

Fits a folded 8.5” x 11” letterhead


Square Specifically designed for square invitations of varying sizes