Brother thermal label printers are a popular entry point for sellers because they're affordable and widely available, but like any thermal printer, they only print shipping labels correctly once the driver and paper size are set right. The setup is quick, and getting it right the first time avoids the mis-sized label problems that cause failed scans.
Install the Brother driver
The first step is installing the correct Brother driver for your specific model, not a generic fallback. Brother's driver handles the label sizes and thermal settings properly, and installing it before connecting the printer prevents the operating system from auto-installing a generic driver that prints mis-sized labels.
Set the paper size to 100 × 150mm
In the driver and the print dialog, set the paper size to 100 × 150mm, or 4x6 inches. This is the setting that keeps shipping labels at full size, and leaving it at A4 or Letter is the most common cause of Brother labels that print too small or clipped.
Load the labels correctly
Load the roll with the labels feeding from the correct direction, and set the media guides snugly against the roll so it feeds straight. Brother printers accept standard 4x6 rolls on a 25mm core, so our 100 × 150mm labels load directly with no adjustment.
Adjust print density if needed
Brother printers have a density or darkness setting that controls print darkness. If barcodes look faint, increase it; if they're smudgy, reduce it. The goal is a solid, scannable barcode, and a quick scan-test with your phone confirms you've got it right.
Print labels at 100% scale
When printing a shipping label PDF, print at 100% scale with 'fit to page' off. Any scaling shrinks the barcode, and a shrunken barcode is a parcel that fails to scan, the same failure our barcode guide explains.
Connect to your shipping workflow
Once the printer is set up, it works with any shipping workflow that outputs a standard label PDF, whether that's Click & Drop, a marketplace or a shipping app. There's no Brother-specific configuration inside those tools, they just print through the Brother driver like any other printer.
Test before your first real batch
Print one label, scan the barcode with your phone, and confirm it reads before relying on the printer for real dispatch. This single test validates the driver, paper size and density settings together, and it's worth repeating whenever you change stock or settings.
Frequently asked questions
What paper size do I set a Brother label printer to? 100 × 150mm, or 4x6 inches, for standard shipping labels. This keeps the label and barcode at full size.
Why are my Brother labels printing too small? The paper size or scale is usually wrong. Set the driver to 100 × 150mm and print the PDF at 100% with 'fit to page' off.
Can Brother printers use standard 4x6 labels? Yes, Brother thermal printers accept standard 100 × 150mm rolls on a 25mm core.
Labels that load into any Brother
Our 100 × 150mm direct thermal rolls on a 25mm core drop straight into Brother thermal printers, ready to print.
Shop 4×6 Labels