GTIN check digit calculator

Open GTIN check digit calculator on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "gtin-check-digit-calculator",
  "category": "data-tools",
  "built": true,
  "requirements": "One explicit complete length per run removes the ambiguity between a GTIN-12 and a 12-digit GTIN-13 body. Arithmetic checks do not establish GS1 allocation, ownership or product identity. Maximum 1,000,000 input characters, 10,000 records and 100,000 result cells. CSV output is bounded to 4,000,000 characters.",
  "implementation": {
    "fields": [
      {
        "key": "mode",
        "label": "Input includes check digit",
        "value": "With check digit",
        "type": "select",
        "values": [
          "With check digit",
          "Without check digit"
        ]
      },
      {
        "key": "length",
        "label": "Complete GTIN length",
        "value": "13",
        "type": "select",
        "values": [
          "8",
          "12",
          "13",
          "14"
        ]
      },
      {
        "key": "exportMode",
        "label": "Spreadsheet formula handling",
        "value": "Protect formulas",
        "type": "select",
        "values": [
          "Protect formulas",
          "Preserve original cells"
        ]
      }
    ],
    "live": true,
    "background": true,
    "presentation": "metrics",
    "note": "One identifier per line, up to 10,000 records and 1,000,000 characters. Select the complete GTIN length explicitly: a 12-digit string could be a GTIN-12 or a GTIN-13 body. Spaces and leading zeros are preserved. Invalid records remain in the report. Arithmetic validity does not confirm GS1 allocation or ownership. Runs on your device.",
    "experience": {
      "automatic": true,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "GTIN strings",
      "placeholder": "One identifier per line",
      "help": "Choose the full length in the settings. Input and output identifiers stay literal strings. Results update as you type. Up to 1,000,000 characters.",
      "helpParts": [
        "Choose the full length in the settings. Input and output identifiers stay literal strings.",
        "Results update as you type.",
        "Up to 1,000,000 characters."
      ],
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

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