What is an Amazon FNSKU barcode and how do I print it?

An FNSKU (Fulfillment Network Stock Keeping Unit) is Amazon's unique identifier for FBA products. FNSKU barcodes are encoded using the Code 128 format (e.g. starting with X00...). You can print FNSKU labels using our 30-up label generator formatted for standard Avery 5160 label sheets.

Can I print barcode labels on standard Avery 5160 30-up label sheets?

Yes! Switch the generator view mode to 'Printable 30-Up Sheet'. This formats your barcode, product title, and price into standard 1" x 2-5/8" label dimensions matching Avery 5160, 5260, and 8160 30-per-page label sheets.

What bar width and height settings ensure clean warehouse scanning?

Maintain a bar width setting of at least 2px (or 10-12 mil in thermal printing) and a minimum height of 50px to 70px. Ensure sufficient 'quiet zone' whitespace margins on the left and right sides of the barcode bars to prevent laser scanner errors.

Why is my generated barcode not scanning properly on my scanner or phone?

Scanning failures are usually caused by insufficient color contrast (bars must be dark on a light background), distorted aspect ratio scaling, low printer DPI resolution, or entering invalid characters for fixed-length symbologies like UPC-A (12 digits) or EAN-13 (13 digits).

Do I need a GS1 subscription to generate barcodes with this tool?

Our tool generates valid industrial barcode graphics for internal inventory, Amazon FNSKU labeling, shipping packages, and private tracking. However, if you plan to sell products in major retail stores (Target, Walmart), you must purchase official registered GTIN/UPC prefixes directly from GS1.

Industrial Barcode & 30-Up Label Sheet Studio

Free Barcode & Label Sheet Generator

Generate Code 128, EAN-13, UPC-A, Code 39, and QR codes. Export high-res PNG graphics or print standard 30-up Avery 5160 label sheets.

Barcode Symbology & Parameters

Select Barcode Symbology

Barcode Encoded Data StringFormat rule:

Product Title (For Printed Label)

Product Price ($)

Bar Height: 70px

Bar Width: 2px

Labels Per Sheet: 30 (Max 30)

Include Human-Readable Text Below BarsShow Dashed Grid Outline (Alignment Check)

Avery 5160 Printable 30-Up Layout Preview

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

Organic Cotton T-Shirt (M)

Barcode

$24.99

SellerKit Supply Chain & Barcode Engineering Team

Retail Logistics & GS1 Barcode Standards Specialists

2026 Barcode Symbology Specifications VerifiedLabeling & Barcode Engineering

Financial Modeling & Accuracy Disclaimer:Calculations generated by SellerKitHub tools rely on published marketplace fee rates (Amazon Seller Central 2026, Etsy Seller Handbook, eBay Merchant Terms). Estimates are for planning purposes. Final referral fees, dimensional weight packaging charges, and taxes may vary depending on category reclassifications, peak seasonal storage surcharges, and regional carrier postal rates.

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Industrial Barcode Symbology Specification Matrix

Technical specifications for standard 1D linear barcodes and 2D matrix QR codes.

Symbology	Character Set	Length Rule	Primary E-Commerce Use Case	Scanner Compatibility
Code 128	Full ASCII 128	Variable length	Amazon FNSKU & Warehouse Shipping	100% Universal 1D / 2D Scanners
UPC-A	Numeric (0-9)	Exact 12 Digits	North American Retail POS Packaging	Universal Retail Laser Scanners
EAN-13	Numeric (0-9)	Exact 13 Digits	Global International Retail Products	Universal Retail Laser Scanners
Code 39	Alphanumeric Caps	Variable length	Industrial Logistics & Automotive	Universal 1D Scanners
QR Code	Binary / UTF-8 / URL	Up to 7,089 chars	Website Links & Digital Manuals	Smartphone Cameras & 2D Image Scanners

Free Barcode Generator FAQs

Code 128 is a highly compact, variable-length alphanumeric symbology used for Amazon FNSKU labels, internal inventory tracking, and shipping logistics. UPC-A is a 12-digit numeric barcode standard used primarily for retail products in North America. EAN-13 is a 13-digit numeric barcode standard used internationally for retail product packaging worldwide.