Validate an existing code
- Inputs
- Paste 4006381333931 in Full code mode.
- Output
- It passes the EAN-13 length and check-digit tests.
This does not verify allocation, ownership or print quality.
Batch barcode checker
Check numeric identifier lengths, GS1 Modulo 10 check digits and duplicates in a pasted list. Explicit data-only mode can append a check digit; no ownership lookup.
Free to useNo signupMade for daily work
Batch barcode checker
Check your existing identifiers. No registration or ownership lookup.
Up to 2,000 identifiers. Full-code mode never repairs an invalid digit. Data-only mode keeps the original input beside the appended result.
Current results
Swipe the table sideways to see all columns.
Useful? Share this tool.
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How this tool works
Valid here means the numeric length and Modulo 10 check digit pass. It does not verify assignment, product identity, ownership or printed barcode quality. Blank lines are skipped and duplicates are reported.
Files and privacy
Where is my data processed?
On this device. The tool does not upload your data or synchronize inventory. Exports contain values only. Scan lists and results are not stored after you leave.
What if I edit an input?
Calculated outputs, printing and exports become unavailable until you rebuild the result, so a stale result is not exported.
Worked example
Illustrative inputs and outputs to help you check your own task.
Append only when requested
- Inputs
- Select Data only, GTIN-13, then enter 400638133393.
- Output
- The output is 4006381333931.
The original input remains visible beside the result.
Your work stays yours.
These tools run in your browser. They do not upload your entries or store them after you leave. Downloads are created on your device. Hosting providers may process standard access logs.