{# canonical_base is the OWNING tenant's origin: all 16 Peasy domains serve the same catalogue, so a page rendered by a non-owner points its canonical at the owner instead of competing with it. Falls back to this site for static/self-owned pages. #}

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Barcode Format Reference

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About Barcode Format Reference

Browse barcode symbology specifications — compare 1D, 2D, postal, and retail barcode formats with encoding rules and use cases.

How It Works

Select a barcode category to browse detailed specifications for each format, including character sets, capacity limits, check digit algorithms, and common applications.

Frequently Asked Questions

What's the difference between 1D and 2D barcodes?

1D barcodes (UPC, EAN, Code 128) encode data in varying-width lines — compact but limited capacity. 2D barcodes (QR, Data Matrix, PDF417) use a grid of dots/squares for much higher capacity.

Which barcode format should I use?

For retail products: UPC-A (North America) or EAN-13 (international). For shipping: Code 128 or GS1-128. For mobile scanning: QR Code. For small items: Data Matrix.