Barcode Check Digit Validator

Barcode Check Digit Validator

Validate the check digit of any retail or shipping barcode in one paste. The validator auto-detects the format from the digit count, recomputes the expected check digit using the right algorithm — GS1 modulo-10 for EAN/UPC/GTIN, modulo-11 for ISBN-10 — and shows a position-by-position breakdown so you can see exactly where a transcription error crept in.

Nutzung

1. Paste a barcode into the Barcode field. Spaces, dashes, and dots are stripped automatically.
2. Verlassen Format auf Automatische Erkennung, or pick a specific standard if your input is ambiguous (an 8-digit number could be EAN-8 or UPC-E).
3. Read the verdict — valid means the trailing check digit matches what the algorithm expects, invalid means it does not.
4. Inspect the Calculation Breakdown to see the per-digit weights, the running sum, and the modulo result.
5. To validate many barcodes at once, paste them into Stapelvalidierung — one per line — and the table populates per row.

Unterstützte Formate

• EAN-13 – 13-digit retail barcode used worldwide on consumer products.
• EAN-8 – 8-digit short form for small packages.
• UPC-A – 12-digit code used across North America.
• UPC-E – 8-digit compressed UPC; the validator expands it to UPC-A internally.
• ISBN-10 – Legacy 10-character book identifier, may end in X.
• ISBN-13 – Modern 13-digit book identifier, prefixed with 978 or 979.
• GTIN-14 – 14-digit logistics-unit identifier used in shipping containers.

Funktionen

• Auto-detect format – Recognises seven barcode standards by length and prefix; override manually when needed.
• Schritt-für-Schritt-Auflösung – Position, digit, weight, and product for every contributing digit.
• Expected vs provided – Surfaces the digit the algorithm expected so you can fix the wrong character at a glance.
• Stapelmodus – Validate hundreds of barcodes in a single paste, with a per-row format and verdict.
• Forgiving input – Spaces, dashes, dots, and lowercase X are normalised before validation.
• 100% clientseitig – Numbers never leave the browser; nothing is logged or sent to a server.