Standards & Security
What Are Barcode and QR Coded Seals For?
Digital tracking with barcode and QR.
Direct answer
Barcode- and QR-coded security seals carry the seal serial number or related digital data in a scannable format, reducing manual entry and accelerating the link between the physical seal and the digital record. The code itself does not make the seal mechanically stronger; its value is in identity capture, verification and process automation.
What you will learn
Barcode/QR speeds up serial-number reading and data entry.
Code type, data length, marking area and reader device should be selected together.
Curvature, contrast and print quality on the actual seal affect scanning performance.
QR can carry more data or a URL, while 1D barcodes may suit some high-speed industrial workflows.
The code should be part of a unique-identity and event-record strategy, not decorative printing.
What do barcode and QR do on a seal?
When an operator manually enters an eight- or ten-digit serial number, characters can be skipped or transposed. Scanning reduces this risk by sending the physical code directly to WMS, TMS, ERP or a dedicated tracking application, making application and handover verification faster.
GS1's traceability approach combines identification, data capture and sharing. The same logic applies to security seals: define a unique identity, capture it through barcode/QR and link it to a process event in the system. The code by itself is not a traceability system.
Barcode or QR?
| Criterion | 1D barcode | QR / 2D |
|---|---|---|
| Data capacity | More limited | Higher |
| Marking geometry | Needs longer horizontal area | More square/compact area |
| Reader | Depends on laser/image-based system | Typically image/camera based |
| URL use | Possible but can be less practical | Well suited to mobile URL/digital content |
| High-speed industrial flow | Can be strong with existing scanner infrastructure | Can be strong with camera-based infrastructure |
Technical checklist for code design
- What data will be encoded: serial only, product code, lot or URL?
- Is there enough code size and quiet space on the real marking area?
- Is there sufficient contrast between seal color and marking?
- Does surface curvature or texture distort the code?
- Has first-read testing been performed using the actual phone, handheld or fixed reader?
- Does scanned data exactly match the human-readable serial?
How to implement a barcode/QR seal project
- 1
Define the business objective
Is the goal only faster serial entry, or event tracking and portal access as well?
- 2
Define the data schema
Separate which identifiers/fields are encoded and which remain in the backend system.
- 3
Test printing on the real seal
Verify scan quality against color, surface, curvature and marking method.
- 4
Pilot with field devices
Measure first-read rate across actual phones/terminals, lighting conditions and distances.
- 5
Connect the event flow to the system
Record events such as applied, transferred, delivered and opened against the serial identity.
Frequently asked questions
Is a barcoded seal more secure?
It is not automatically mechanically stronger. The barcode strengthens recording and verification by capturing identity quickly and accurately.
Can a QR code contain the serial number?
Yes. The serial can be encoded directly, or the code can carry a secure URL linked to the serial.
Is a GS1 barcode mandatory?
Not automatically for every seal application. Internal serial tracking can use an organization's own coding structure; GS1 standards and partner requirements should be evaluated where commercial/interoperable identification is needed.
Why does a QR code sometimes fail to scan?
Insufficient size, low contrast, poor printing, curvature, glare, damage or an unsuitable reader can reduce scan performance.
Should barcode and human-readable serial appear together?
It is useful in many operations. Manual verification remains possible if the scanner fails, and scanned data can be compared with the visible number.
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