#10 Envelopes

A standard #10 envelope measures 4-1/8" x 9-1/2". It is designed to hold a standard letter-size sheet folded into thirds, which is why it is one of the most common envelope sizes for everyday business mail.

#10 envelopes are commonly used for invoices, billing statements, checks, contracts, notices, letters, and general business correspondence. They are also widely used for office mailings and direct mail campaigns.

A regular #10 envelope has a solid front, while a #10 window envelope includes a transparent address window so the recipient address printed on the document inside shows through. Window envelopes are popular for invoices, statements, and other business mailings where speed and consistency matter.

Yes. #10 envelopes are the standard choice for business mailing because they fit folded letter-size documents, look professional, and are available in a wide range of styles including window, security tint, and self-seal options.

Yes. #10 envelopes are widely available in bulk quantities for offices, schools, medical facilities, financial mailings, and other high-volume business uses. Buying in bulk is often the most cost-effective choice for routine mailing needs.

Yes. Many #10 envelopes are available with a security tint pattern inside the envelope to help conceal sensitive information. These are commonly used for statements, checks, account notices, and confidential business mail.

Yes. #10 envelopes are available in self-seal, peel-and-seal, gum-seal, and other closure styles. Self-seal envelopes are a popular option for faster processing in offices that send large volumes of mail.

Yes. Some #10 envelopes can be customized with printed return addresses, logos, branding, or other business information. Custom #10 envelopes are often used for invoicing, client correspondence, and professional direct mail.

A standard letter-size sheet, 8-1/2" x 11", fits inside a #10 envelope when folded into thirds. This is one reason #10 envelopes are such a standard choice for business documents.