GTIN Check Digit Calculator

Calculate & validate GTIN/UPC/EAN check digits

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About GTIN Check Digit Calculator

A comprehensive GTIN (Global Trade Item Number) check digit calculator that validates and generates check digits for all GTIN formats: GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN/ISBN-13), and GTIN-14 (ITF-14). Uses the GS1 weighted modulus-10 algorithm with alternating weights of 1 and 3. Shows step-by-step calculation with digit weighting visualization, supports batch validation of multiple codes, and auto-detects the GTIN format. Essential for retailers, manufacturers, supply chain managers, and anyone working with product barcodes.

GTIN Check Digit Calculator Features

  • All GTIN formats
  • Auto-detect format
  • Step-by-step math
  • Batch validation
  • Generate missing digits

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