Frequently Asked Questions
- What is the 4×6 thermal label size in millimetres?
- A 4×6 thermal label is 4 inches wide by 6 inches tall, which equals 101.6 mm × 152.4 mm (commonly rounded to 102 × 152 mm). This is the universal standard for shipping labels used by UPS, FedEx, USPS, Amazon FBA, and DHL.
- Which printers support 4×6 thermal labels?
- All major thermal label printers support 4×6 labels, including Rollo, Zebra ZD and ZT series, DYMO 4XL, and Brother QL-1110NWB. For Zebra printers, you can use either the ZPL export or the thermal PDF export. For Rollo, DYMO, and Brother, use the thermal PDF.
- What barcode format should I use on a 4×6 label?
- Code 128 is the standard choice for 4×6 shipping and warehouse labels. It encodes tracking numbers, SKUs, and mixed alphanumeric codes efficiently and produces a barcode that scans reliably even at lower DPI. For 2D barcodes with more data, QR Code or Data Matrix both fit well on a 4×6 label.
- Can I generate multiple 4×6 labels from a spreadsheet at once?
- Yes. Upload a CSV or Excel file with your tracking numbers or SKU list. Bulk Barcode Generator creates a multi-page PDF with one label per page at the exact 4×6 inch format, ready to load into any thermal printer. There is no row limit.
- Do I need special software to print 4×6 labels?
- No. The thermal PDF from Bulk Barcode Generator opens in any standard PDF viewer. In the print dialog, select your thermal printer, choose actual size (100%, no scaling), and send to print. For Zebra printers, you can also use the ZPL export for native print quality.