A double window envelope has two transparent openings cut into the front face. The top window shows the sender's name and address, which is pre-printed on your business check or invoice. The bottom window shows the recipient's name and mailing address, also printed directly on the document inside. When the document is folded correctly and inserted, both addresses appear through the windows without any labels, handwriting, or additional printing.
This design is specifically built for business check and invoice mailings because the document inside carries all the addressing information. The envelope does not need to be addressed separately. Fold the check, insert it, seal it, and it is ready to mail.
Benefits of Double Window Envelopes for Business
Many small businesses are looking for ways to cut costs and be more efficient in every way possible.
Using double-window envelopes is one of the small but significant ways to improve your bottom line. Benefits of Double Window Envelopes: double window envelopes give a professional appearance in all of your business transactions.
Often, when you use a double-window envelope, it is for mailing business checks or for sending invoices to customers. Using this type of envelope allows customers and vendors to quickly determine who the mail is from and what type of mail they are receiving.
Another benefit to double window envelopes is that they are time efficient. Instead of having to print both the item to be mailed and an envelope address or mailing label, you can simply fold that item appropriately and stick it in the envelope. This saves time by reducing the number of steps needed to prepare mail and also money in printer ink or toner.
Double window envelopes also have several safety features built into them. Often, they are printed on paper that has watermarks on it and is protected from the ability to see what is inside the envelope.
You can order double-window envelopes in many different colors. Many business owners prefer to order double window envelopes in shades that compliment their business checks, stationary, or printed logos. If you are using double-window envelopes for direct marketing programs or for sending promotional materials, you can also order them in distinctive colors that will make your mail stand out to potential customers.
Browse the complete range of business checks at Checkomatic to find check formats that pair with double window envelopes.
Time Savings: How Double Window Envelopes Speed Up Check Mailing
The time savings from double window envelopes become significant at volume. Consider a business mailing 50 vendor checks per week. Without double window envelopes, the workflow requires printing the checks, then printing 50 mailing labels or addressing 50 envelopes separately, then applying each label. With double window envelopes, the workflow is fold, insert, seal. The addressing step is completely eliminated.
Where Time and Cost Savings Add Up
- No mailing label printing: Each label requires paper, toner, and printer time. On 50 checks per week, that adds up to over 2,500 labels per year.
- No envelope addressing: Handwriting or printing directly on envelopes takes time and introduces the risk of address errors.
- No address verification step: Because the address on the envelope is the same address printed on the check or invoice, mismatches between the envelope address and the enclosed document are eliminated.
- Faster mail preparation: High-volume mailing operations can prepare significantly more pieces per hour compared to label-based methods.
For businesses using QuickBooks or other accounting software, the checks print with all address fields populated automatically from the vendor record. The document goes straight from the printer into the double window envelope. No intermediate steps. See the full range of computer checks for business that pair with double window envelopes.
Security Features in Double Window Envelopes
The original content mentions that double window envelopes have watermarks and protection from being seen through. Here is what those security features mean in practice.
Security Tinting
The interior of Checkomatic's double window envelopes is printed with a security tint pattern. This pattern makes it impossible to read the contents of the envelope by holding it up to a light source. Anyone handling the envelope in transit cannot see the check amount, account number, or payee information through the paper without opening the envelope.
Watermark Paper
The envelope paper itself carries a watermark embedded during manufacture. This is the same watermark technology used in business check paper. It identifies the envelope as genuine business correspondence and adds an additional layer of security for high-value check mailings.
Window Material Options
Windows are available in clear plastic film or thin paper. Plastic windows are more durable and clearer. Paper windows are better for businesses with recycling compliance requirements. Both options maintain the security tinting protection on the interior of the envelope.
Checkomatic Double Window Envelope Options
Double Window Check Envelopes Peel and Seal
58 reviews | From $19.75
- Security-tinted for confidentiality
- Self Seal Closure
- Guaranteed to match our checks
Double Window Envelopes for Invoices and Statements Flip and Stick
50 reviews | From $19.75
- Security-tinted for confidentiality
- Self Seal Closure
- Guaranteed to match our checks
Double Window Check Envelopes Gum Flap
24 reviews | From $18.75
- Security-tinted for confidentiality
- Guaranteed to match our checks
Double Window Check Envelopes Self Seal
50 reviews | From $18.75
- Security-tinted for confidentiality
- Guaranteed to match our checks
Which Double Window Envelope Closure Is Right for Your Business
Checkomatic offers four closure types. The right one depends on your mailing volume and workflow.
| Closure Type | How It Works | Best For | Price Point |
|---|---|---|---|
| Peel and Seal | Peel liner, press flap down | High-volume mailing, no moisture needed | From $19.75 |
| Flip and Stick | Fold flap, press to seal | Invoice and statement mailing | From $19.75 |
| Self Seal | Press two adhesive strips together | Fast sealing without tools | From $18.75 |
| Gum Flap | Moisten flap to activate adhesive | Low volume, cost-sensitive | From $18.75 |
For businesses mailing 50 or more checks or invoices per week, Peel and Seal or Self Seal saves the most time since no moisture or tools are required. Gum Flap is the most economical option for low-volume operations. For QuickBooks-compatible checks that pair with these envelopes, see QuickBooks checks.
Choosing Size, Shape, and Paper Weight for Double Window Envelopes
Double window envelopes are available in a wide variety of shapes and sizes. Some business managers choose large double-window envelopes for sending invoices, business proposals and other items to their customers since they prefer not to fold correspondence. For other items, such as business checks, you might choose a standard envelope size.
Another consideration for choosing a double window envelope is the weight of the paper. Twenty-pound envelope paper is very lightweight and can save you on mailing costs. However, some managers prefer to use a heavier 24-pound envelope paper to give their envelopes and correspondence a heavier presence when clients hold the items.
20lb vs 24lb Envelope Paper: Which to Choose
- 20lb paper: Lightweight, reduces postage cost on large mailings, meets USPS first-class mail requirements for standard contents. Best for high-volume payroll and vendor check mailings where cost per piece matters.
- 24lb paper: Heavier, more substantial feel in the recipient's hand, communicates quality and professionalism. Best for client-facing invoices, statements, or any mailing where brand impression matters as much as cost.
For manual business checks that may be mailed in these envelopes, see manual checks. For voucher and standard format options, see voucher checks vs wallet checks.
Recycling Double Window Envelopes
Not all recycling programs are equipped to handle double-window envelopes with plastic windows. There are double-window envelopes that have thin paper windows as an alternative to plastic windows. You might contact your local recycling program to ask what they recommend if you decide you want to use double-window envelopes for your business correspondence.
Plastic Window vs Paper Window for Recycling Compliance
If your business has a sustainability policy or requires recycling compliance, paper-window double window envelopes are the simple solution. The entire envelope, including the window, is made from paper and is accepted by most curbside and commercial recycling programs without any modification or window removal.
Plastic-window envelopes require the plastic film to be removed before the envelope can be recycled as paper. In high-volume mailing operations, this step is rarely practical. If recycling compliance is a priority, specify paper-window envelopes when ordering.
If you are looking for simple ways to save money on business costs, consider using double-window envelopes. They are professional, easy to use and save time and money.
Accepted by the World's Leading Banks
Checkomatic's double window envelopes are sized and formatted to work with ABA-compliant business checks. The window positions are guaranteed to align with Checkomatic check formats, ensuring the correct address appears in each window every time. All check stock manufactured by Checkomatic meets and exceeds ABA specifications, and the matching double window envelopes complete the professional mailing package.
What Customers Say About Checkomatic
All reviews below are published on checkomatic.com and reproduced verbatim. Source: checkomatic.com/quickbooks-starter-pack-product, 4.5 stars from 166 verified reviews.
"First time ordering and I am super impressed with the quality of the checks. No issues with delivery. I will be ordering again!"
TClinton | ★★★★★ 5/5 | April 9, 2025 | Source: checkomatic.com/quickbooks-starter-pack-product
"Affordable and efficient. My go-to business check printer."
Doe | ★★★★★ 5/5 | January 24, 2025 | Source: checkomatic.com/quickbooks-starter-pack-product
"We use CheckoMatic for all of our check needs! They have great prices and we receive our products in a timely manner!"
CG's Tax Service | ★★★★★ 5/5 | September 18, 2024 | Source: checkomatic.com/quickbooks-starter-pack-product
"I got 500 checks for less than half of what the bank wanted for 200!"
VVA Voucher Checks (Vietnam Veterans of America) | ★★★★★ 5/5 | July 6, 2024 | Source: checkomatic.com/quickbooks-starter-pack-product
"ASJ Wilson Construction has been a client of checkomatic for some years now and they've never disappointed this company. Thank you checkomatic for all that you do."
ASJ Wilson Construction | ★★★★★ 5/5 | June 6, 2024 | Source: checkomatic.com/quickbooks-starter-pack-product
"Been with them for 15 years. Always reliable, always good quality, good service. What more can you ask for?"
ATV Inc. | ★★★★★ 5/5 | April 5, 2024 | Source: checkomatic.com/quickbooks-starter-pack-product
Why Choose Checkomatic for Double Window Envelopes and Business Checks
Guaranteed Address Alignment
Checkomatic's double window envelopes are guaranteed to match Checkomatic check formats. The window positions align correctly with the business name and recipient address on every check, eliminating the risk of window misalignment that occurs when envelopes and check stock are ordered from separate sources.
Four Closure Types Available
Peel and Seal, Self Seal, Gum Flap, and Flip and Stick , all available with security tinting and watermark paper. Choose the closure that matches your mailing volume and workflow without compromising on security features.
Security Tinting on Every Envelope
Every Checkomatic double window envelope includes interior security tinting that prevents the contents from being read by holding the envelope to light. Paired with Checkomatic's business checks, which include six built-in security features, the complete mailing is protected from interception to delivery.
In-House Manufacturing Since 1997
All envelopes and checks are manufactured at Checkomatic's own facility in Monroe, NY. Direct manufacturing means consistent quality, faster turnaround, and lower prices than ordering envelopes and checks through a bank or office supply retailer. For complete ordering information, see what is the best place to order checks online and shipping and handling.
Checks and Envelopes From One Source
Ordering checks and matching double window envelopes from the same manufacturer eliminates fit and alignment problems. The benefits of using QuickBooks checks extend naturally to the mailing stage when paired with Checkomatic's matching envelopes.
