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A browser-based a4 three-fold guide for window envelopes tool. No data sent to server.

📘 How to Use

  1. Choose the paper orientation (A4 Portrait or Landscape).
  2. Select a standard preset or enter custom dimensions for the envelope window.

A4 Three-Fold Guide for Window Envelopes

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For accurate sizing, please select "Actual size" or "Scale 100%" in your printer settings.

Window
Fold Line
Fold Line
Window Envelope Guide
*Print at "Actual Size"

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Article

Window Envelope Fold Guide Generator | Create Printable A4 Tri-fold Templates

This tool generates a printable A4 guide to help you perfectly tri-fold documents for window envelopes. It's designed for anyone who needs to accurately align addresses on invoices, official letters, or direct mail with the envelope's window.

💡 Tool Overview

  • Printable A4 Templates: Creates a full-scale guide on an A4 sheet, clearly marking the fold lines and the exact position of the envelope's window.
  • Standard & Custom Dimensions: Features a standard preset based on common envelope sizes and allows you to fully customize the window's width, height, and position for any type of envelope.
  • Portrait & Landscape Support: Works for both vertically (portrait) and horizontally (landscape) oriented documents, adjusting the fold lines accordingly.
  • Instant Preview & Download: Visually confirm your layout in a real-time preview and download the guide as a high-quality PNG image, ready for printing.

🧐 Frequently Asked Questions

Q. How do I ensure the printed guide is the correct size?

A. When printing, it is crucial to set your printer's scaling options to "Actual size" or "100%". If you use options like "Fit to page" or "Shrink to fit," the dimensions will be incorrect.

Q. What is the "Standard" preset for?

A. The standard preset is configured for the Japanese "Nagagata 3" (N3) envelope, a popular business size designed to perfectly fit a tri-folded A4 sheet. While it serves as a convenient default, you can use the "Custom" settings to create a guide for any window envelope, such as the DL or #10 sizes common in Europe and North America.

📚 A Brief History of the Window Envelope

The window envelope was patented in the early 20th century and revolutionized business correspondence. Its primary innovation was eliminating the need to print the recipient's address on both the letter and the envelope, saving time, reducing errors, and cutting costs. By strategically folding the letter, the address printed on the document itself shows through the transparent window.

This simple design is a masterclass in efficiency. It ensures that the letter never ends up in the wrong envelope, a critical feature for sending sensitive documents like bills or bank statements. The A4 tri-fold is a global standard for fitting documents into common business envelopes, and this tool helps you master that fold with precision every time.