Barcode Tools
Free utilities for Code 128 and GS1 standards. Check digits, AI reference, and more.
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Check Digit Calculator
Calculate or verify the check digit for GTIN, SSCC, and other GS1 identifiers using the Modulo 10 (Weight 3-1) algorithm.
Enter without check digit to calculate, or with check digit to verify.
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Show calculation steps
| Pos | Digit | Weight | Product |
|---|---|---|---|
Enter digits above to calculate
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GS1 Application Identifier Reference
Complete reference of GS1 Application Identifiers used in GS1-128, GS1-DataMatrix, and GS1-QR barcodes.
| AI | Name | Format | Length | FNC1 | Category |
|---|---|---|---|---|---|
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Barcode Scanner
Scan barcodes from your camera or upload an image. Decode Code 128, GS1-128, EAN-13, QR, and DataMatrix.
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Drop an image or click to upload
Supports JPG, PNG, GIF, BMP
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