Question 1

What barcode formats can I generate for free?

Accepted Answer

bar-gn supports 10 barcode formats: GS1-128, EAN-13, EAN-8, UPC-A, UPC-E, Code 128, Code 39, ITF-14, DataMatrix, and QR Code. All formats can be exported as PNG, SVG, or PDF at no cost.

Question 2

How do I create a QR code for WiFi?

Accepted Answer

Select QR Code from the format dropdown, choose the WiFi card, enter your network name (SSID), password, and security type (WPA/WEP), then click Generate. The QR code can be scanned by any smartphone to connect automatically.

Question 3

What is a GS1-128 barcode used for?

Accepted Answer

GS1-128 barcodes encode structured supply chain data using Application Identifiers (AIs). They typically include a GTIN product code (AI 01), batch/lot number (AI 10), and best before date (AI 15). They are widely used in logistics, healthcare, and food industries.

Question 4

What is the difference between EAN-13 and UPC-A?

Accepted Answer

EAN-13 is a 13-digit barcode used internationally for retail products. UPC-A is a 12-digit barcode used primarily in North America. UPC-A is actually a subset of EAN-13 (a UPC-A code can be represented as an EAN-13 with a leading zero).