How to Print Labels at Actual Size (100% Scale) Without Scaling Errors

An 80 × 40 mm design should produce an 80 × 40 mm page, but the print dialog and printer driver can still scale or reposition its contents. Confirm the file, media setting and physical output separately.

Prepare a measurable example

In UDImaker, set a demonstration label to 80 × 40 mm. Add a rectangle that is exactly 20 mm wide and place it away from the edges. This gives you a measurement target that is easier to assess than estimating barcode size by eye.

Export a PDF. UDImaker sets the PDF page to the label's millimetre dimensions and places a 300 DPI raster image on it. It is not a vector PDF. A correct page size does not force a driver to use that size automatically.

Configure the print job

1. Open the PDF in a viewer that exposes page size and scaling.
2. Select the actual label printer and choose or create matching 80 × 40 mm media in its driver.
3. Select Actual size or 100%. Disable fit-to-page and shrink-to-printable-area options.
4. Choose the correct orientation and one page per sheet or label.
5. Review the preview for clipping, unwanted margins and accidental A4 or Letter media selection.

Option names vary between viewers and drivers. Browser headers and footers should not be added to label artwork. If you use the browser's print route instead of a PDF viewer, check those settings there as well.

Diagnose the measured result

If the 20 mm reference prints at 18 mm, the artwork has been scaled to 90%. Review the page and media settings before enlarging the saved design. Compensating in the design can hide a driver problem and cause later jobs to print incorrectly.

If the rectangle measures 20 mm but starts too far left, the likely issue is placement, an offset or media calibration rather than scale. If horizontal and vertical measurements differ, inspect stretching and print resolution settings.

Handle stock differences explicitly

Exact 4 × 6 inch stock is 101.6 × 152.4 mm, while 100 × 150 mm stock is a different size. Use the actual roll specification. For desktop sheets, a single-label PDF is not automatically a complete multi-label sheet template.

After correcting the settings, print another sample on the intended material, measure it and scan its barcode. Save a note of the viewer, driver preset, stock and orientation with the reviewed design. A repeatable print setup is more useful than a one-off visual match.