14 Envelopes

The #14 envelope is the largest standard commercial letter envelope in the U.S. numbering system. At 5 inches tall by 11 1/2 inches wide, it sits above the #12 and handles thick multi-page correspondence, legal-size document submissions, and any outgoing piece that pushes past what a smaller commercial envelope can carry comfortably. At Business Envelopes, we carry #14 envelopes in plain white and white window configurations, both with moistenable gum flap closure, available blank or with custom logo and return address printing. Free shipping on every order with no minimums.

#14 Envelope Size and Dimensions

A #14 envelope measures 5 inches tall by 11 1/2 inches wide (5 x 11.5 inches). In metric, that's approximately 127 x 292 mm. It is larger than every other standard commercial letter envelope in the numbered series: a quarter inch taller and half an inch wider than the #12, which itself is already significantly larger than the standard #10.

The extra width over a #12 is the meaningful dimension here. At 11.5 inches, the #14 comfortably accommodates a legal-size 8.5 x 14 inch sheet folded into thirds, where the #12 at 11 inches cannot quite manage that fold cleanly. For law firms, government agencies, healthcare administrators, and financial institutions that regularly mail correspondence on legal-size letterhead, the #14 solves the document-to-envelope mismatch that arises when legal-size paper gets forced into a #10 or #12 with a fold that compresses across the text area.

What Buyers Searching "12 x 14 Envelopes" and "8 1/2 x 14 Envelopes" Are Looking For

These search queries typically reflect two different needs. "8 1/2 x 14 envelopes" is most often asked by buyers looking for an envelope that fits a legal-size sheet, either flat or folded. A legal-size 8.5 x 14 sheet folded into thirds produces a panel roughly 4.67 x 8.5 inches, which fits inside a #14 at 5 x 11.5 with clearance. For flat mailing without folding, a 9 x 12 or 10 x 13 catalog envelope is the right format. The #14 handles the folded-legal scenario that neither the #10 nor the #12 manages well.

"12 x 14 envelopes" and "10 x 14 envelopes" refer to physical dimension envelopes rather than the commercial number system. There are no standard manufactured envelopes at those exact dimensions in the commercial catalog format. Buyers searching those terms are typically looking for either the #14 commercial envelope (5 x 11.5 inches) or a large-format flat-document mailer like the 10 x 13 clasp envelope or the 10 x 15 clasp envelope, depending on what needs to go inside.

#14 Envelope Dimensions in the Commercial Size Hierarchy

Understanding where the #14 sits relative to the other commercial sizes clarifies when it's the right choice:

• #10: 4 1/8 x 9 1/2 inches, standard letter correspondence, tri-folded 8.5 x 11 sheet
• #11: 4 1/2 x 10 3/8 inches, slightly more room than a #10 for thicker single-sheet enclosures
• #12: 4 3/4 x 11 inches, multi-enclosure correspondence, check-plus-statement mailings
• #14: 5 x 11 1/2 inches, largest standard commercial letter envelope, tri-folded legal-size sheets, thick multi-page packages

The #14 also qualifies for USPS First-Class letter-rate postage when contents are under 3.5 oz, because at 5 inches tall it remains within the USPS letter-rate height limit of 6 1/8 inches. Unlike flat-document formats like the 9 x 12 or 10 x 13 that automatically mail as flats at a higher postage rate, the #14 keeps its contents in the letter-rate zone while providing more document capacity than any other standard commercial envelope.

#14 Business Envelopes: Styles We Carry

#14 White Envelopes, Gum Flap

Plain bright white 24 lb wove stock with a moistenable gum flap. For thick correspondence, legal-size folded submissions, multi-attachment mailings, and any outgoing piece that requires the capacity of the #14 format. Available blank or with custom logo and return address printing. Laser and inkjet compatible for in-house addressing and printing needs.

#14 White Window Envelopes, Gum Flap

Same bright white wove stock with a clear poly-film address window. The window displays the recipient's address from the document inside, eliminating the label or addressing step on every piece. For billing operations, legal correspondence programs, and financial mailings that use legal-size letterhead where the standard #10 or #12 window format is too small. Available with custom return address and logo printing on the face.

Custom Printing on #14 Envelopes

Both #14 styles support custom printing. Return address, company name, logo, and tagline printed directly on the envelope stock before shipment. A PDF proof is provided for approval before production begins. Artwork stays on file for reorders, so future orders pull the same specs automatically without re-uploading files. Blank stock ships same or next day. Custom printed orders ship in 7 to 10 business days from proof approval.

For programs that include multiple commercial envelope sizes, our full window envelope catalog covers #9 through #14 across all closure types. For flat-document mailing that doesn't require folding, the 9 x 12 envelope category and the clasp envelope range handle those formats. For bulk pricing across a multi-size program, request a quote here and we'll price the full scope together.

Frequently Asked Questions About #14 Envelopes