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Barcode Tools

Generate, validate and understand UPC, EAN, Code 128, ITF-14, Data Matrix and other barcode formats with browser-based tools and standards-aware guidance.

Reviewed August 9, 2026QiiChain Technical EditorialHow we verify content

Barcode GeneratorCreate a scannable barcode in the browser and choose the symbology that matches your product, logistics or internal-label workflow.UPC-A Barcode GeneratorGenerate a UPC-A symbol from a valid 12-digit UPC/GTIN-12. The tool validates the check digit before rendering.UPC-E Barcode GeneratorGenerate a compact UPC-E symbol for compatible UPC number-system data and verify the supplied value before rendering.EAN-13 Barcode GeneratorGenerate an EAN-13 retail barcode from a valid 13-digit GTIN and confirm the final check digit before rendering.EAN-8 Barcode GeneratorGenerate an EAN-8 symbol from a valid eight-digit GTIN-8 and verify its check digit.Code 128 Barcode GeneratorEncode letters, digits and common ASCII characters in a high-density Code 128 barcode for internal inventory, warehouse and logistics labels.Code 39 Barcode GeneratorCreate a Code 39 barcode for alphanumeric internal labels, asset tags and legacy workflows that require this symbology.ITF-14 Barcode GeneratorRender an ITF-14 symbol from a valid GTIN-14 for corrugated cases and logistics packaging where ITF-14 is appropriate.GS1-128 Barcode GeneratorCreate a GS1-128 barcode from structured GS1 Application Identifier data such as GTIN, lot, date and serial information.Data Matrix GeneratorEncode text or product data in a compact Data Matrix symbol for workflows that require a dense two-dimensional code.GS1 DataMatrix GeneratorGenerate GS1 DataMatrix from GS1 element data, preserving Application Identifier structure for compatible supply-chain workflows.GS1 QR Code GeneratorGenerate a QR Code carrying GS1-structured data or a GS1 Digital Link URI for next-generation product identification workflows.Barcode Number Type IdentifierEnter a numeric product identifier to see which GTIN length it matches, whether the check digit validates, and which common retail barcode format can represent it.Barcode Number ValidatorCheck a numeric UPC/EAN/GTIN-style value for supported length, digits and check-digit integrity before using it in a barcode.UPC ValidatorCheck whether a UPC-A/GTIN-12 contains 12 digits and a correct GS1 modulo-10 check digit.EAN ValidatorValidate EAN-8 or EAN-13 numeric identifiers and identify an incorrect or missing check digit.UPC Check Digit CalculatorCalculate the final digit for an 11-digit UPC-A body and return the complete 12-digit UPC.EAN Check Digit CalculatorCalculate the final check digit for a 7-digit EAN-8 body or 12-digit EAN-13 body.ISBN-13 Check Digit CalculatorCalculate or validate the final ISBN-13 check digit using the same alternating 1/3 weighting used by EAN-13.Barcode Size CalculatorEstimate rendered barcode width and height from module width, bar count and target magnification so you can plan a label before printing.

Start with the task, not the terminology

Generate, validate and understand UPC, EAN, Code 128, ITF-14, Data Matrix and other barcode formats with browser-based tools and standards-aware guidance. Choose the smallest tool that answers the immediate question, then move to the related workflow only if the result shows another dependency.

What QiiChain validates here

The barcode tools section separates deterministic checks from business decisions. Where a GS1 identifier or barcode rule is involved, syntax and check-digit evidence is shown separately from licence ownership, retailer acceptance and physical print quality. Inventory calculations show their formula and assumptions rather than presenting an unexplained score.

How to use the result safely

Keep the source value, generated output and review date together. Test final barcode artwork in the real scanner/print environment and compare inventory calculations with recent operating data before applying a change across many SKUs.

Technical references

Sources used on this page

GS1 General Specifications and standards repository — GS1
The current GS1 General Specifications are Release 26.0, ratified January 2026; this foundational standard defines identification keys, data attributes and barcode use.

QiiChain summarizes source material and applies it to the tool or workflow. The linked source remains authoritative for its own standard or product documentation.