📊 GTIN Validator - Global Trade Item Number
Professional GTIN validator that verifies Global Trade Item Numbers across all formats (GTIN-8/EAN-8, GTIN-12/UPC-A, GTIN-13/EAN-13, GTIN-14). Features check digit validation, format detection, conversion between UPC/EAN formats, and detailed compliance reporting for retail and e-commerce use.
GTIN Validation Results:
✅ Valid GTIN-13/EAN-13
4902430101027 - Check digit verified
🔍 GTIN Analysis
Format Detected
Check Digit
🔄 Format Conversions
04902430101027
4902430101027
How to Use This GTIN Validator - Global Trade Item Number
How to Use the GTIN Validator
- Enter GTIN Number: Paste or type your GTIN/UPC/EAN code (8-14 digits)
- Select Validation Level: Choose standard, detailed, or technical analysis
- Enable Conversions: Check box to see all format variations
- Click Validate: Get instant validation with check digit verification
- Review Results: View format detection, validation status, and conversions
Supported Formats: GTIN-8 (EAN-8), GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14
How It Works
How GTIN Validation Works
1. Format Detection
Automatically identifies GTIN type based on digit count and format patterns
2. Check Digit Calculation
Uses modulo-10 algorithm to calculate and verify the check digit
3. Format Validation
Ensures compliance with GS1 standards for each GTIN format
4. Cross-Format Conversion
Provides equivalent GTIN representations across different formats
Algorithm: The check digit uses weighted sum modulo-10 calculation per GS1 specifications
When You Might Need This
- • Validate product UPC codes for retail inventory systems and POS integration
- • Verify EAN-13 barcodes for international e-commerce product listings and compliance
- • Check GTIN-14 codes for case/pallet tracking in warehouse management systems
- • Validate product identifiers before submitting to Google Shopping or Amazon
- • Verify barcode accuracy during product packaging and labeling processes
- • Check GTIN compliance for pharmaceutical products and medical device tracking
- • Validate product codes for grocery store inventory and supply chain management
- • Verify international product identifiers for customs and import/export documentation
- • Check barcode integrity for manufacturing quality control and product authentication
- • Validate GTINs for marketplace integrations and product data syndication systems
Frequently Asked Questions
What's the difference between GTIN-8, GTIN-12, GTIN-13, and GTIN-14?
GTIN-8 (EAN-8) is 8 digits for small products, GTIN-12 (UPC-A) is 12 digits used in North America, GTIN-13 (EAN-13) is 13 digits used internationally, and GTIN-14 is 14 digits for trade item groupings like cases or pallets. All use the same check digit algorithm but serve different purposes in the supply chain.
How does the GTIN check digit calculation work?
The check digit uses a modulo-10 algorithm: multiply alternating digits by 1 and 3 (starting from right, excluding check digit), sum the results, subtract from next multiple of 10. For example, UPC 72527273070 becomes (0×1 + 7×3 + 3×1 + 7×3 + 2×1 + 7×3 + 5×1 + 2×3 + 7×1) = 76, so check digit is 80-76=4, making it 725272730704.
Can I convert between UPC and EAN formats?
Yes! GTIN-12 (UPC) can become GTIN-13 (EAN) by adding a leading zero. GTIN-13 can become GTIN-14 by adding a leading zero. The tool shows all compatible format conversions while maintaining the same check digit validation across formats.
What makes a GTIN invalid?
GTINs are invalid if they have wrong digit count (not 8, 12, 13, or 14), incorrect check digit calculation, or contain non-numeric characters. Some number ranges are also restricted - for example, UPCs starting with 2 are for store-specific use, and certain EAN prefixes are reserved for special applications.
Do I need GTINs for online marketplaces?
Yes, most major marketplaces (Amazon, Google Shopping, eBay) require valid GTINs for product identification. Each product variant needs its own unique GTIN. The tool helps verify your codes meet marketplace requirements before listing products.