Keep the body as text
All 17 or 18 digits stay strings, so leading zeroes remain visible and safe to paste into a label workflow.
Private, local logistics Production
SSCC Check Digit Validator
Check the GS1 SSCC Mod-10 check digit locally, while keeping the distinction between mechanical consistency and assignment clear.
Production only — no account, registry lookup, saved inputs, sharing, or tracking query. Calculation inputs stay in this browser. If you allow analytics, Google receives usage events without input values. Only your analytics preference is saved.
Inputs stay in this tab
Check an SSCC
Choose whether you have the 17-digit body or all 18 digits. Do not add spaces, punctuation, or an application identifier to the input.
Worked example
A leading-zero SSCC body, calculated in full
Body 06141410000000004 produces weighted sum 35, check digit 5, and complete SSCC 061414100000000045.
The check digit 5 makes this 18-digit string mechanically consistent with the locked GS1 Mod-10 method. It does not prove that the SSCC was assigned, is unique, is authorized, or identifies a shipment.
How the model works
A transparent mechanical check
The rightmost body digit receives weight 3, then weights alternate 1 and 3 moving left. Products are shown in original left-to-right position order.
Inspect every weight
Each digit's position, alternating weight, product, and weighted sum are exposed rather than hidden behind a score.
Read the boundary
A matching digit means mechanical consistency only. It does not establish assignment, uniqueness, authorization, tracking, or barcode compliance.
Context only
Primary source notes
These references establish the locked algorithm and SSCC display context. Source reference (text only): links are enabled after hydration; this Production does not fetch them at runtime.
Reviewed 2026-08-28
GS1 General Specifications Release 26.0.0
The locked standard authority for this release's rightmost-weighted Mod-10 calculation.
Host: ref.gs1.org · Path: /standards/genspecs/26.0.0/GS1 Logistic Label Guideline
Context for SSCC and the human-readable (00) application identifier; this page does not assess label compliance.
Host: www.gs1.org · Path: /standards/gs1-logistic-label-guideline/1-3Questions
Before you act on a result
Does a matching check digit prove a number is assigned?
No. A matching check digit only shows mechanical consistency; it does not prove assignment, uniqueness, authorization, or tracking.
What does (00) mean here?
(00) is shown as the human-readable GS1 application identifier prefix. It is not part of the 18-digit SSCC body and this Production does not create a barcode.
Does this tool look up a company prefix or shipment?
No. The calculation stays in this browser tab and never queries a registry, account, order, warehouse, carrier, or tracking system.
Boundaries
What this Production does not do
A matching check digit only shows mechanical consistency; it does not prove assignment, uniqueness, authorization, or tracking.
- No company-prefix allocation, uniqueness, membership, or registration check.
- No barcode generation, scanning, label compliance, account, order, warehouse, carrier, or tracking connection.
- No share URL, saved input value, or automatic clipboard action. Calculation inputs stay in this browser. If you allow analytics, Google receives usage events without input values. Only your analytics preference is saved.
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