Self Seal Envelopes | Self Adhesive Envelopes for Business


Order Self Seal Envelopes and get FREE shipping! Save time when sealing your envelopes by ordering products with a convenient peel-off adhesive strip. These strips are mess-free and ensure your mail is safely delivered to its destination. Select your order from a variety of sizes including #9, #10, 10x13, 9x12, 6x9 and Invitation sized envelopes. We also offer large sized self seal envelopes made from moisture and tear resistant Tyvek materials. These products are great for mailing invitations to your special event, important business correspondence or marketing materials.

If you would like to personalize your order, we offer customizable options. Print your company logo, contact information or original artwork directly onto your envelopes. See a PDF proof before printing. We will work with you until you are 100% satisfied with your order. Protect your recipient's privacy by ordering self seal envelopes with a security tint. Available in a variety of sizes and styles so finding the envelope you need is easy.


Self Seal Envelopes


Large Self Seal Envelopes


Invitation Self Seal Envelopes


#10 Self Seal Envelopes

Looking to save time when stuffing your envelopes? We offer self seal envelopes featuring a mess-free peel-off adhesive strip. Simply peel off the strip and apply pressure to secure. It's that easy! Mail important business correspondence like checks, invoices or any 8 1/2 x 11 document folded into thirds. Shop for No 10 Self Seal Envelopes.


Window Envelopes

We offer window envelopes in many different sizes including #6 3/4, #7 3/4, #8 5/8, #9, #10, #11, #12, 6x9 and 9x12. These products are great for showcasing a pre-printed message or mailing address through a transparent Poly-film window. We offer custom designs if you would like to brand your envelopes with logos, images or artwork. Shop for Window envelopes.


Not finding what you need? Have a question about a printed order? We would love to see if we can make your order - and life - a little bit easier.


Self Seal Envelopes - Size Guide

If you're not sure what size you need, measure the length (width) and height of your document and/or check. You'll want to choose an envelope that is at least 1/16" or 1/8" larger than your insert, to make sure it fits.

Not sure what size you need? Our size guide can help you pick the right envelope, for the right reason. The most popular sizes of self seal envelopes are #9, #10, and 9x12. #9 and #10 envelopes are perfect for mailing business communication, while the 9x12 is great for mailing larger items.

Standard Self Seal Envelopes

  • #6 3/4 (3 5/8 x 6 1/2) - Fits a personal check, plus a small insert - up to 3 1/2 x 6 1/4 inches.
  • #8 5/8 (3 5/8 x 8 5/8) - Ideal for many printed commercial and business checks.
  • #9 (3 7/8 x 8 7/8) - Return envelope. Fits inside a standard #10 envelope.
  • #10 (4 1/8 x 9 1/2) - Standard business envelope. Fits an 8 1/2 x 11 piece of paper folded in thirds.
  • #11 (4 1/2 x 10 3/8) - Larger than a standard #10 envelope. Can fit a check and folded documents.
  • #12 (4 3/4 x 11) - Large business envelope. Often used for mailing special checks or statements.

Large Self Seal Envelopes

  • 6 x 9 (Exactly 6 x 9 inches) - Fits a standard 8 1/2 x 11 piece of paper folded in half. Ideal for small catalogs.
  • 9 x 12 (Exactly 9 x 12 inches) - Fits a standard 8 1/2 x 11 sheet of paper with 1/4-1/2 inch extra on the sides.
  • 10 x 13 (Exactly 10 x 13 inches) - Fits a standard 8 1/2 x 11 sheet of paper with extra space. Ideal for presentation folders, magazines, catalogs, booklets, and other large mail items.

Self Seal Invitation Envelopes

  • A2 Self Seal Invitation (4 3/4 x 5 3/4) - Fits perfectly into an A6 or an A7. Use as a reply or RSVP envelope.
  • A7 Self Seal Invitation (5 1/4 x 7 1/4) - Fits a 5x7 card perfectly.
  • 7 1/2" Self Seal Square (7 1/2 x 7 1/2) - Fits up to a 7 1/4 x 7 1/4 inch card perfectly.

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