# QR codes on packaging

> Using QR codes on product packaging: substrate and print constraints, error correction for industrial conditions, traceability and GS1 Digital Link.

Source: https://qr-code-build.com/qr-code-for-packaging/  
Last reviewed: 2026-08-24  
Publisher: QR Code Builder

## Summary
QR codes on packaging carry product information, batch traceability, authentication and links to instructions. Print constraints are tighter than paper: use error correction Q or H, allow for ink spread on board and film, keep codes off tight curves, and test on the actual substrate before a production run.

## What each material does to a code
| Substrate | Main issue | Minimum module |
|---|---|---|
| Coated carton | Minimal — best case | 0.4 mm |
| Uncoated kraft | Heavy ink spread | 0.6 mm |
| Corrugated board | Flute lines distort modules | 0.8 mm |
| Flexible film | Stretch and print registration drift | 0.6 mm |
| Shrink sleeve | Distortion around the curve | 0.8 mm, on the flat panel only |
| Direct-to-metal | Reflection and low contrast | 0.7 mm, matte finish |
| Thermal label | 203 dpi with dot spread | 0.5 mm |

Ink spread — dot gain — is the recurring problem. Dark modules widen, light gaps narrow, and a code that measured correctly in the file becomes marginal on the press. Ask the printer for their dot gain figure and size up accordingly, or specify a slightly reduced dark module size in the artwork.

## Where the code goes on the pack
- **Flat panels only.** Decoders tolerate gentle curvature but fail on tight radii. On a bottle, that means the label's flat face, not the shoulder.

- **Away from seams and folds.** A code crossing a carton crease is a code that fails once the pack is glued.

- **Clear of the shrink zone.** Sleeve distortion at the taper will destroy the pattern.

- **Not under a window or a gloss varnish.** Both reflect.

- **Consistent position across the range.** Warehouse staff scanning hundreds of units per hour should not have to search for the code.

- **Away from the barcode.** Two codes side by side confuse both handheld scanners and phone cameras.

## Batch data, and the GS1 direction of travel
For traceability, encode the identifiers directly as [plain text](/text-qr-code-generator/) so the label works in a warehouse with no signal, or encode a link that carries the batch in the path. A common compact format:

```
SKU:4471-B|LOT:A2609|MFG:2026-08-14|LINE:3
```

Retail is moving towards **GS1 Digital Link** — a QR code containing a structured URL that carries the GTIN and batch data in the path, readable both as a web link by a shopper's phone and as product data by a till scanner. The format looks like:

```
https://example.com/01/09506000134376/10/A2609
```

Retailers and regulators are steadily moving towards this for the codes that will eventually replace the linear barcode at checkout. If you are designing packaging now with a multi-year print run, it is worth checking whether your sector has a timetable.

## Error correction as an engineering decision
On packaging, error correction is not a stylistic setting. Level Q recovers a quarter of a damaged code, which is what lets a scuffed, taped, partially wet label still scan on arrival.

- **Level M** for retail cartons that go from box to shelf undamaged.

- **Level Q** for transit packaging, outer cases and anything handled repeatedly.

- **Level H** for cold chain, industrial parts and any label likely to be abraded, taped over or partially obscured.

- Higher levels mean more modules, so plan the physical size around the level rather than choosing the level after the layout is locked.

## Frequently asked questions
### What error correction level should packaging QR codes use?
Level Q for most transit and retail packaging, and level H where labels get abraded, taped over or exposed to moisture.

### Can a QR code go on a curved bottle?
On the flat face of the label, yes. Tight curves distort the pattern beyond what decoders tolerate.

### Should packaging codes contain a link or plain text?
Plain text if the code must be read in a warehouse with no signal. A link if the code is for consumers. GS1 Digital Link does both.

### How do I stop ink spread breaking the code?
Ask the printer for their dot gain figure, size the code up accordingly, and always proof on the real substrate rather than on paper.

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Licence: this page may be quoted with attribution to QR Code Builder (https://qr-code-build.com/qr-code-for-packaging/).