Barcode apps generate and print. None of them prove a label scans as the product it belongs to. Mastiff scan-checks the exact PDF before you print it and shows the decoded value next to the one you intended. Every UPC, EAN-13, and Code 128 gets a valid check digit and stays unique across your catalog. Presets for Dymo, Brother, Zebra, and Avery print at the exact size you chose, with a calibration page for your printer. Previews, test prints, and reprints are never counted as printed labels.

• Every barcode is scan-checked before it prints, so a bad label never ships
• Valid check digits at generation and at print, duplicates blocked catalog-wide
• Exact-size presets for Dymo, Brother, Zebra, Avery, custom sizes, calibration
• Previews, test prints, and reprints are never counted as printed labels
• Print labels from a purchase order CSV, with column mapping, quantities filled