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Review
Invoice Numbers Explained: What They Are & How They Work
An invoice number is a unique ID on every invoice you issue. Learn the three parts (prefix, date, sequence), US IRS recordkeeping rules, numbering formats, and how to repair duplicates or gaps.
UPC vs EAN-13: Which Barcode Do US Sellers Actually Need?
UPC-A is the 12-digit barcode for US retail; EAN-13 is the 13-digit form used elsewhere — the same GS1 GTIN in two lengths. Here’s which to print, the check-digit math, GS1 licensing costs, and what Sunrise 2027 changes.
EAN-13 vs EAN-8: Which Barcode Format Fits Your Product?
Pick up any product in a store and you’ll find a […]
Code 128 vs Code 39: Barcode Differences Explained (2026)
If you work with barcodes — whether in shipping, health […]
ISBN 10 vs 13: Key Differences, Conversion Guide, and the 979 Prefix Explained
Every book published today carries a 13-digit ISBN — th […]