Envelope Size Guide for Business & Everyday Mailings
Envelope Size Guide
Selecting the correct envelope size is essential for professional mailings. Use this guide to compare envelope sizes —from standard business envelopes to specialty types —and find the best fit for your letters, invoices, or marketing materials.
Regular Envelopes
Regular envelopes area staple for daily business correspondence. Available in multiple business sizes, they’re perfect for invoices, letters, and checks. Choose options with or without windows, or upgrade to self-seal and security-tinted designs for privacy.
Other popular regular envelopes include:
- #5 Regular Envelopes (3-1/8″ x 5-1/2″) – Same size as a coin envelope, but side opening. It can be mailed inside of other envelopes or used to store smaller items. This envelope cannot be mailed by itself.
- #6-1/4 Regular Envelopes (3-1/2″ x 6″) – The smallest commercial envelope size available, it’s just the right size for everyday usage; perfect for mailing small items such as a folded personal check. Use to store tickets for an upcoming event or store reminders, coupons, recipes, social security cards, or other items that require organization in your personal records.
- #6-3/4 Regular Envelopes (3-5/8″ x 6-1/2″) – Great for personal or corporate business. This size could be used for invoices, sales pieces, checks, or correspondence.
- #7 Regular Envelopes (3-3/4″ x 6-3/4″) – The ideal model that is suitable for short business correspondence or home office needs.
- #7-1/2 Regular Envelopes (3-15/16″ x 7-1/2″) – It can be mailed inside of other envelopes and used as a return envelope or be used as a mailer for smaller envelopes.
- #8-5/8 Regular Envelopes (3-5/8″ x 8-5/8″) – Popular as business payment envelopes, it is also ideal for checks (no need to fold business-sized checks).
- #9-5/8 Regular Envelopes (4-1/2″ x 9-5/8″) – These are slightly larger than the #9 envelope so it can fit more folded pages.
- #11 Regular Envelopes (4-1/2″ x 10-3/8″) – The larger size allows for more folded pages, storage, and can act as an outer envelope to the #10 envelope being used as a return envelope.
Common Use: Ideal for sending invoices, business checks, and professional correspondence. Often used internally or with reply envelopes for client communications.
Window Envelopes
Window envelopes simplify mailing by displaying the recipient’s address through a transparent panel. Ideal for invoices, billing statements, and payments, these business envelopes come in single, double, and full-face window options.
Common window envelope sizes:
- #6-3/4 Window Envelopes (3-5/8″ x 6-1/2″) – Fits a personal check.
- #8-5/8 Window Envelopes (3-5/8″ x 8-5/8″) – Great for sending check payments from accounting software like Quickbooks.
- #9 Window Envelopes (3-7/8″ x 8-7/8″)– This size fits comfortably inside a standard #10 envelope, so is often used as a return envelope.
- #10 Window Envelopes (4-1/8″ 9-1/2″)– Standard business envelope. Fits an 8 1/2″ x 11″ piece of paper folded in thirds.
Common Use: Optimized for billing statements, financial documents, and check payments where recipient information is visible through the window.
Square Envelopes
Square envelopes offer a modern, professional option for business mailings, invitations, and branded correspondence. Available in a wide range of envelope sizes – from 5″ x 5″ to 13″ x 13″ – these envelopes combine style and practicality for any occasion. Note that mailing square envelopes may require additional USPS postage due to their shape.
Learn more about the variety of announcement and invitation envelopes we have and their uses on our site >>>
Catalog Envelopes
Catalog envelopes, also known as open-end envelopes, feature a short-edge flap for easy loading and secure mailing. Choose from windowless catalog envelopes for privacy or window catalog envelopes made from durable 28# white sulphite material that display address details clearly. Available in a variety of envelope sizes – from 2-1/2″ x 4-1/4″ to 22″ x 27″ – these business-size envelopes are ideal for mailing or shipping catalogs, booklets, magazines, and other large documents. Options include kraft, white, or Tyvek materials with closures such as metal clasps, self-seal, or pressure-sensitive seals.
Booklet Envelopes
Booklet envelopes are ideal for mailing unfolded brochures, catalogs, and reports. Designed with a long-side opening, they make it easy to insert larger documents while maintaining a neat, professional presentation. Available in a wide range of envelope sizes – from 4-3/16″ x 9-1/2″ to 12″ x 16″ – they accommodate everything from half-folded sheets to full-size papers. Common business sizes like 9″ x 12″ and 10″ x 13″ are perfect for standard mailings. Choose from windowless booklet envelopes for flexible labeling or window options that display preprinted addresses for bulk or automated mailings. With multiple window styles —from small corner cuts to large showcase panels —these business-size envelopes ensure a streamlined, professional appearance for every mailing.
Remittance Envelopes
Remittance envelopes simplify mail-based payments and donations for businesses and organizations. Commonly used by nonprofits, schools, and churches, these business-size envelopes feature ample space for messaging, branding, and secure returns, making them a practical choice for fundraising or payment collection.
| Envelope | Size | Common Use | Colors |
|---|---|---|---|
| #6-1/4 Remittance Envelope | 3-1/2″ x 6-1/4″ | Return Envelope, Mail Order, Subscriptions, Donations, Coupons | White, Goldenrod, Green, Pink, Gray, Blue, Canary, Creme, Ivory, Lilac |
| #6-3/4 Remittance Envelope | 3-5/8″ x 6-1/2″ | Return Envelope, Mail Order, Subscriptions, Donations, Coupons | White, Goldenrod, Green, Pink, Gray, Blue, Canary, Creme, Ivory, Lilac |
| #9 Remittance Envelope | 3-7/8″ x 8-7/8″ | Return Envelope, Mail Order, Subscriptions, Donations, Coupons
*Fits perfectly inside of a #10 envelope* |
White, Goldenrod, Green, Pink, Gray, Blue, Canary, Creme, Ivory, Lilac |
Coin Envelopes
Coin envelopes are crafted from durable, heavy-duty paper to securely hold coins, cash, and other small valuables. Available in a wide range of envelope sizes from #00 to #7H, these business-size envelopes are perfect for organizing and storing items like jewelry, hardware parts, seeds, or receipts with ease.
Specialty Envelopes
Specialty envelopes are designed to meet specific business and professional needs, from bank deposit envelopes to job jackets and policy storage. Crafted from durable materials like kraft paper or vinyl, these business-size envelopes provide secure, long-lasting protection for important documents and records.
Some popular specialty envelopes are:
| Envelope | Size | Common Use | Colors/Material |
|---|---|---|---|
| Offering Envelopes | 3-1/8″ x 6-1/4″ | Churches, Fundraising, Charity, Any type of Money Collection
*perfect for holding cash and checks* |
White, Blue, Goldenrod, Gray, Green, Creme, Pink, Canary |
| Bank Deposit Envelopes | 3-1/2″ x 7″
3-1/4″ x 7″ 3-3/4″ x 7″ |
Use for checks, cash, other documents | White |
| Tax Form Envelopes | Variety | Designed to properly display addresses when tax forms are inserted | White, Blue Security Tint |
| Money Gift Envelopes | 2-3/4″ x 6-5/16″ | Birthdays, Graduations, Holidays | White |
| Door Hanger Envelopes | 4-1/2″ x 10-1/4″ | Marketing materials, receipts, invoices | White |
| Job Jacket Envelopes | 3-1/2″ x 5″
5″ x 6″ 7″ x 9″ 10″ x 7″ 10″ x 12″ 12″ x 9″ 13″ x 9″ 15″ x 11″ |
Protect and store work orders, inventory cards, MSDS sheets, SOPs, production schedules, project folders, photos, negatives, digital output | Vinyl |
| Jewelry Envelopes | 3-1/8″ x 5-1/2″
3-5/8″ x 6″ |
Jewelry, Parking Tickets | White, Tan / Brown Kraft |
| Employment Record Envelopes | 8-3/4″ x 12″ | Holds up to 1/2″ of employee records. | Manila |
| Job Ticket Envelopes | 8-3/4″ x 11-1/2″
9-1/2″ x 12″ |
Holds up to 1/4″ of custom job paperwork for filing. | Manila |
| Policy Envelopes | 4-1/2″ x 10-3/8″
4-1/8″ x 9-1/2″ 5″ x 11-1/2″ |
Protects important paper for an extended amount of time. | White, Tan / Brown Kraft, Black |
Need a Custom Envelope?
If our standard envelopes don’t fit your needs, The Supplies Shops can create a custom solution. Choose your ideal size, closure, window placement, color, and material. Fill out our custom quote form or reach out directly to get started.
