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The #12 is the commercial letter envelope that sits between the standard #10 and the largest #14 in the U.S. numbering series. At 4 3/4 x 11 inches, it gives you five eighths of an inch more height and five eighths of an inch more width than a #10, with a correspondingly larger interior that handles thick multi-page correspondence, heavier paper stock, and documents that consistently make a #10 look strained at the seam. This version adds a single clear poly-film window at the standard commercial left-side position, showing the recipient's address from the document inside. One buyer notes this size is hard to find and calls it just so convenient. That's the case for ordering here: a commercial-grade window envelope in a size that most retail channels don't stock. Available blank or with custom logo and return address printing from Business Envelopes. Free shipping, no minimums.
The window on this envelope functions the same way as on any commercial window envelope. A clear poly-film panel at the standard commercial left-side position shows the recipient's address from the folded document inside. The standard tri-fold aligns the address field with the window position without any template adjustment. Any document already formatted to show the recipient's address in the standard window position on a #10 will align correctly in a #12 using the same fold. The window position is consistent across commercial sizes relative to the left edge and bottom of the envelope.
For organizations that use heavier-weight stationery, letterhead on thicker stock, or documents with multiple enclosures that routinely strain a #10, the #12 window provides the same addressing convenience in a format that handles the content load without the flap seal fighting the packet thickness. The 4 1/2 x 10 3/4 inch interior holds a letter sheet folded into thirds with nearly half an inch of clearance on each side rather than the tight quarter-inch clearance of a #10, which means multi-enclosure packets load cleanly and the envelope arrives flat rather than visibly overstuffed.
The standard window envelope in U.S. business supply programs is the #10. It's the default for single-sheet correspondence and light billing programs. The #12 window is the right upgrade when the #10 is consistently too small for the typical outgoing content load. Common applications for the #12 window include thick monthly statement mailings with multiple attachment pages, insurance and financial correspondence where the packet includes a cover letter plus several pages of account detail, legal correspondence where the document set is heavier than a standard single letter, and any recurring program where the #10 runs visibly near its capacity on a typical outgoing piece.
All three qualify for First-Class letter-rate postage. The #12 window delivers the same addressed-from-document convenience as the #10 windows in a format that handles thicker content loads without compromising the seal or the appearance of the piece on arrival.
For the standard #10 window envelope for lighter single-sheet correspondence, see the #10 White Window Gum Flap. For the #12 without a window in a plain white format, see the #12 White Gum Flap. For the largest commercial letter window at the #14, see the #14 White Window Gum Flap. Browse the full window envelope range for all sizes. Ships same or next business day on blank stock.
This size is hard to find and I am pleased I found them, it is just so convenient! Check out their other products too!