GTIN Check Digit Validator
Validate a complete GTIN-8, GTIN-12, GTIN-13, or GTIN-14, or compute the check digit from its data digits. An explicit mode avoids treating a 12- or 13-digit value as the wrong GTIN variant.
Description
Validate a complete GTIN-8, GTIN-12, GTIN-13, or GTIN-14, or compute the check digit from its data digits. An explicit mode avoids treating a 12- or 13-digit value as the wrong GTIN variant.
GTIN Check Digit Validator is a focused tool for the following task. Validate a complete GTIN-8, GTIN-12, GTIN-13, or GTIN-14, or compute the check digit from its data digits. An explicit mode avoids treating a 12- or 13-digit value as the wrong GTIN variant. It reports Valid?, Check digit, Kind from the values you provide rather than inventing measurements, coefficients, or professional judgment that are not part of the input.
When to use GTIN Check Digit Validator
Use this text operation when its stated character encoding, token boundaries, normalization, case handling, and output format match the surrounding workflow.
- Digits
- Required string. Complete GTIN in validation mode, or data digits without the check digit in compute mode.
- Mode
- Required string. Choose whether the input includes its check digit.
The cited overview of Data validation supplies background for the terminology and domain context used by this tool.1
How GTIN Check Digit Validator works
Validate a complete GTIN-8, GTIN-12, GTIN-13, or GTIN-14, or compute the check digit from its data digits. An explicit mode avoids treating a 12- or 13-digit value as the wrong GTIN variant. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.
- Valid?
- Returned boolean. Whether a complete code is valid; true in compute mode when the data digits are accepted.
- Check digit
- Returned integer. Check digit calculated with the GS1 modulo-10 alternating 3/1 weighting.
- Kind
- Returned string. GTIN length implied by the selected mode and input length.
Limitations and assumptions
- Unicode normalization, locale, grapheme clusters, malformed input, ambiguous syntax, and implementation-specific conventions can change text-processing results.
- Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.
Alternative or Complementary approaches
Preserve the original text, test representative non-ASCII and malformed cases, and use a standards-aware parser or serializer when interoperability matters.
References
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Data validation — Wikipedia contributors
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