Window Self-Seal Envelopes - Convenient and Secure Mailing Solutions

Window Self-Seal Envelopes are the perfect solution for securely mailing documents while providing a clear view of the contents. These envelopes feature a convenient self-adhesive seal that eliminates the need for glue, tape, or moisture, ensuring quick and easy sealing. The window allows for clear visibility of the recipient's address or contents, making them ideal for invoices, statements, and direct mail. Available in a variety of sizes, our window self-seal envelopes are perfect for businesses and individuals who need an efficient and reliable mailing solution.

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Window Self-Seal Envelopes – Address-Ready Business Mail | Pack Exact

Window Self-Seal Envelopes

Speed up addressing with window self-seal envelopes. Align your printed address on the insert to the clear window, fold, peel and seal—no labels needed. Ideal for statements, invoices, mailings and admin post.

Looking for alternatives? Try Plain Self-Seal Envelopes (no window), bend-proof All Board Envelopes or expandable Cardboard Pocket Envelopes.

Packing books or merchandise? See ColomPac Book Wraps and ColomPac Fast Assembly Boxes.

What are window self-seal envelopes?

Paper envelopes with a transparent address window and a peel-and-seal flap. The window aligns with standard letter layouts so you can print the address on the letter and skip separate labels—perfect for high-volume despatch.

Why choose ours

Faster fulfilment: no addressing labels; peel-and-seal closure saves time.

Clean, professional look: consistent address placement and neat presentation.

Recyclable: paper envelope; remove window film where local guidance requires.

Ideal uses

Business post: statements, invoices, order confirmations, contracts.

Marketing mail: addressed flyers, vouchers and membership updates.

Admin & HR: payroll, notices and general correspondence.

eCommerce inserts: pack slips and returns paperwork—pair with Documents Enclosed wallets on parcels.

International mail: tidy addressing improves readability and delivery.

Filing/archiving: clear addressee visibility in stored envelopes.

Choosing the right size & window layout

SizeFitsTypical contentsTips
DL A4 folded in thirds Statements, invoices, letters Match your letterhead’s window position; keep address block within the safe area
C5 A4 folded once (A5) Booklets, forms, brochures (thin) If bend-sensitive, switch to All Board
C4 A4 flat Reports, proposals, certificates For extra rigidity, use All Board Envelopes

Need space for inserts or small items? Use Cardboard Pocket Envelopes (capacity) or Fast Assembly Boxes.

How to pack efficiently

1) Set up templates: design letters with the address block positioned to suit your chosen window layout.

2) Fold consistently: align folds so the address sits fully within the window with clear margins.

3) Insert & check: place facing the window; confirm no sensitive data is visible below/above the address.

4) Seal once: peel liner, fold and press; no extra tape required.

Complete your mailing toolkit

Envelope alternatives

Plain Self-Seal · All Board (stay-flat) · Pocket (capacity)

Boxes for non-letter mail

ColomPac Book Wraps · ColomPac Fast Assembly · Single Wall

Accessories

Labels · Documents Enclosed · Packing Tape · Cardboard Sheets

Window Self-Seal Envelopes – Frequently Asked Questions

Window variants show the address printed on your letter through a clear panel—no separate label. Plain self-seal have no window and suit generic inserts or hand-addressing.

DL is the common choice (A4 folded in thirds). Ensure your invoice template’s address block aligns with the window location.

Yes—the paper is widely recyclable. Local guidance may ask you to remove the window film before recycling.

Use consistent folds, keep the address block well within the safe area and avoid very smooth inserts that slide inside the envelope.

Choose All Board Envelopes for rigid, stay-flat mailings or Pocket Envelopes for 0–50 mm capacity. For books or merchandise, consider ColomPac Book Wraps.

Many lines can be custom printed. A quick option is to use branded labels on plain stock.


Why Choose Our Window Self-Seal Envelopes?

  • Window for Easy Visibility: The clear window allows you to showcase the recipient's address or contents for easy identification without opening the envelope.
  • Self-Adhesive Seal: The self-adhesive strip ensures quick and easy sealing without the need for glue or tape. Just peel and seal for a secure closure.
  • High-Quality Construction: Made from durable, lightweight paper, these envelopes are strong enough to protect your documents during transit while remaining cost-effective.
  • Available in Various Sizes: Our window self-seal envelopes come in multiple sizes to accommodate different types of documents and mailings, from standard letters to larger forms.
  • Cost-Effective: These envelopes offer a reliable and affordable packaging solution for regular mailings and bulk dispatch, making them ideal for businesses.
  • Professional Appearance: The clean design, coupled with a transparent window, offers a polished and professional look for all your mailings.
  • Efficient and Time-Saving: The self-sealing feature speeds up the packing process, making these envelopes ideal for high-volume mailing tasks.

Shop Window Self-Seal Envelopes in Various Sizes

  • DL Window Self-Seal Envelopes: Ideal for standard-sized documents such as invoices, letters, and contracts. A popular choice for everyday mailing needs.
  • C4 Window Self-Seal Envelopes: Perfect for mailing larger documents such as brochures, certificates, and magazines. Offers ample space for various items.
  • C5 Window Self-Seal Envelopes: Suitable for smaller documents, photos, and letters. A compact and secure packaging solution for your mailing needs.
  • C6 Window Self-Seal Envelopes: Designed for compact items such as small cards, invitations, or flyers. Ideal for businesses that send smaller correspondence.
  • Custom Window Self-Seal Envelopes: We offer custom-sized window self-seal envelopes for businesses with specific packaging needs. Contact us for more details on custom orders.

Single Wall Boxes - FAQs and More

Why Window Self-Seal Envelopes Are the Right Choice

Window self-seal envelopes are an ideal solution for securely mailing documents while allowing for easy visibility of the contents. Their self-adhesive sealing strip ensures fast and easy closure without the need for glue or tape, making them a quick and efficient choice for businesses and individuals. The window provides clear visibility of the recipient's address or contents, which is perfect for invoices, statements, and direct mail campaigns. Available in a variety of sizes, these envelopes are an affordable and reliable choice for mailing your documents and small items.

Frequently Asked Questions About Window Self-Seal Envelopes

Window self-seal envelopes are made from high-quality paper, with a transparent plastic window that allows the recipient's address to be visible. They feature a self-adhesive strip for easy and secure sealing without the need for glue or tape.

We offer window self-seal envelopes in a variety of sizes including DL, C4, C5, and C6. These sizes are suitable for different types of documents, from letters to larger forms. Custom sizes are also available upon request.

Window self-seal envelopes are primarily designed for documents and flat items. While they provide secure protection, for fragile items such as glass or electronics, we recommend adding extra protective materials such as bubble wrap or foam inserts.

Yes, our window self-seal envelopes are made from recyclable paper and plastic, making them an environmentally friendly mailing option. The paper is sourced from sustainable forests, and the envelopes can be recycled after use.

Yes, we offer custom-sized window self-seal envelopes for businesses that require specific dimensions. Whether you need a larger or smaller size, contact us for custom orders and we can provide a tailored solution to fit your needs.

To seal the window self-seal envelopes, simply peel off the protective strip on the adhesive and press the flap closed. The self-adhesive strip ensures a secure and hassle-free seal without the need for additional tape or glue.

Yes, window self-seal envelopes are suitable for both domestic and international shipping. They meet postal requirements and provide secure protection for your items during transit, making them a great choice for international mailings.