Best Window Business Mailing Envelopes of 2025

Securely send confidential documents with Amazon Basics #10 Security-Tinted Self-Seal Business Envelopes. Made of 24-pound white woven paper, these envelopes include a single left address window and an interior security tint for privacy. The peel-and-seal closure eliminates the need for moisture. This pack includes 500 envelopes with dimensions of 4-1/8 x 9-1/2 inches.

EnDoc Self Seal Envelopes offer great versatility for both personal and business use. You can easily send invoices, statements, or important documents without the hassle of messy glue, thanks to their innovative flip and stick closure. Just flip up the bottom flap, fold over the top, and press to seal securely. These envelopes also feature a security tint that protects your information from prying eyes while ensuring the recipient's address is visible. Made from premium quality paper, they work well with most printers, ensuring a professional look without paper jams.

These 500#8 Double Window Self Seal Security Envelopes are designed to fit business checks, QuickBooks & Quicken checks perfectly. The premium security tint pattern ensures secure mailing, while the quick-seal self-seal strip provides a strong, secure self-sealing seal. The dual window design is custom-made for mailing business checks, and each box contains a long-lasting 500-envelope supply, making it ideal for business and home office use.

These #10 Single Window Security Envelopes come with ultra-strong quick seal adhesive, an easy read single window, and a security tint pattern. The envelopes are perfect for everyday business and legal mailing, protecting sensitive contents and information, and are designed with a security wave pattern on the inside to protect contents, data and numbers from being easily read. Each box provides 500 envelopes for a long-lasting supply and is ideal for invoices, statements, and many more business uses.

The Blue Summit Self Seal Envelopes are ideal for sending invoices and business documents securely. With a simple fold and press design, you can quickly seal your envelopes without the need for licking, making the process fast and hygienic. The envelopes feature a dark security tint that keeps your sensitive information hidden from prying eyes. Plus, the single window allows the recipient's address to show clearly, while you can easily add your return address on the top left corner. Made from durable 24 lb paper, these envelopes maintain a professional appearance during transit.

Upgrade from cheap paper envelopes with the Double Window Security Envelopes. The tinted security pattern obscures sensitive information, making it perfect for mailing invoices, statements, and legal documents. The dual window design makes it easy to display postal addresses. Quick-seal closure ensures a secure seal, and the long-lasting supply of 500 envelopes is ideal for mass mailing and all business needs.

The #10 Double Window Security Business Mailing Envelopes are perfect for sending invoices, checks, and everyday home and business mail. The dual window design allows for easy viewing of sender and recipient addresses. The premium security tinted pattern ensures the privacy and protection of sensitive information. The ultra-strong easy seal adhesive strip makes it easy to secure the envelope without the need for tape or glue sticks. Each box contains 500 envelopes, ensuring a long-lasting supply for mass mailing of everyday business tasks.

Quality Park Security Envelopes are the perfect solution for mailing QuickBooks checks and other computer checks. These envelopes are designed with double windows that display only the sender and receiver addresses, ensuring privacy by keeping check amounts and memo lines out of view. The envelopes are slightly wider than standard check envelopes, making it easier to fit wider QuickBooks checks and other computer laser checks. With a Redi-Strip self-seal closure, you can quickly and easily seal the envelopes without the need for moisture. The security tint and pattern make it difficult to see through the envelopes, providing an added layer of protection against prying eyes. With 500 envelopes per box, you'll have plenty to keep your mail routine running smoothly.

The #10 Security Tinted Self-Seal Envelopes are perfect for small businesses, home offices, and everyday use with a pack of 100 envelope, a security tint-pattern to protect contents, and a quick-seal closure that won't easily open or tear. These envelopes are compatible with most inkjet and laser printers, and the EnveGuard Technology ensures the highest quality products made from the safest materials.

The WINPAQ Peel & Seal Envelopes are designed for your mailing needs, measuring 4 ⅛ x 9 ½ inches, perfect for documents folded into thirds. They are versatile, making them suitable for sending invoices, checks, and other important paperwork securely. The peel and seal feature allows you to quickly close the envelope with a reliable, tamper-evident seal, ensuring your contents remain safe. Additionally, the security tint protects sensitive information from prying eyes, while the single window lets the recipient's address show through for easy identification. These envelopes combine convenience and security for all your business mailing needs.