Correctly measuring an invoice window envelope ensures your printed address block aligns perfectly with the clear window panel — eliminating the need to print directly on the envelope. A window envelope exposes the document’s address through a transparent panel, but it only works when the window size, position, and document layout are precisely matched. Our interactive guide below walks through the exact measurement process for invoice window envelopes.
Invoice Window Envelope Measurement Checklist
- Window position: Measure from the left and bottom edges of the envelope face to the near edges of the window.
- Window size: Measure the width × height of the transparent panel (e.g., a standard #10 window is typically 4½” × 1⅛”).
- USPS clearance: The printed address must have at least ⅛” margin between the text and all four window edges.
- Test before ordering: Fold and insert a test document to visually verify alignment before committing to a print run.
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