QR Codes for Labels & Packaging

This is the number that decides everything else, and it is set by a printing standard rather than by any generator.

GS1 specifies a minimum printed module of 0.396 mm and a target of 0.495 mm for 2D codes in retail. A QR code is a grid of modules plus a four-module quiet zone on every side, so the smallest legal width is simply (modules + 8) × 0.396 mm.

Run through the same qrcode encoder this site generates with, at error correction M:

• A short redirect (ez-qr.com/r/ + 7 characters, 27 chars) → 29 modules → 14.7 mm
• A GS1 Digital Link carrying just the GTIN (37 chars) → 29 modules → 14.7 mm
• GTIN plus batch (47 chars) → 29 modules at M, 33 at Q → 14.7–16.2 mm
• GTIN plus batch plus expiry (57 chars) → 33 modules → 16.2 mm

The practical consequence: a 12 mm slot does not work. At 12 mm a 29-module code gives 0.324 mm per module, comfortably under the 0.396 mm floor. The code may still scan on a new phone in good light, and it will fail on a handheld scanner at the till, on an older device, or once the label is scuffed.

Two ways out, and only two. Make the slot bigger, or make the string shorter — which is why a dynamic code earns its place here: it encodes a fixed short redirect no matter how long the real destination is, so the grid stays at 29 modules whatever sits behind it.

Traditionally a product carried two marks: a linear barcode the till reads, and sometimes a QR code for consumers. GS1 Digital Link collapses that into one, by expressing the product identifier as a web address.

Instead of a bare GTIN, the code encodes something like example.com/01/09506000134352, where 01 is the GS1 application identifier for a GTIN. A retail scanner can extract the identifier from that structure; a phone camera simply opens the page. Batch and expiry extend the same path — /10/ABC123 for batch, /17/270401 for expiry.

What it buys you is a single square doing two jobs, and a destination you can change without new artwork if the code is dynamic. What it costs is length: every attribute you add lengthens the string and pushes the module count up, which is the sizing problem above. Carry the GTIN in the code and keep batch-level detail on the page where it is cheap, unless the batch genuinely has to be readable offline.

There is a lot of confident misinformation in this area, so here is the accurate position.

The EU Digital Product Passport does not apply to food. The DPP sits under the Ecodesign for Sustainable Products Regulation, and ESPR explicitly excludes food, feed and medicinal products. It applies to categories such as textiles and apparel, electronics, batteries and furniture. If you sell those, DPP is a real and approaching obligation. If you sell food, it is not yours — and any supplier telling you the EU requires a QR code on packaged food by a given date is repeating a claim that does not exist.

The US food driver is FDA FSMA Section 204, the Food Traceability Rule. It requires records — Key Data Elements tied to Critical Tracking Events — for foods on the Food Traceability List. It does not mandate a QR code. The compliance date was extended to 20 July 2028. A QR code is one convenient way to make those records reachable; it is not what the rule asks for.

The honest summary: for most packaging, a QR code today is a commercial decision rather than a compliance one. Build it because it earns something, and size it properly, rather than because a deadline was misquoted at you.

A label code is printed on material that moves, stretches and gets handled, which is different from every other placement.

Direct thermal fades. It is the cheapest label method and the image degrades with heat, light and abrasion — fine for a shipping label read within days, poor for anything that sits on a shelf.

Thermal transfer holds better, and the ribbon and stock have to be matched; a mismatch produces soft edges that eat into the module grid.

Flexo spreads ink. Dot gain thickens the dark modules, which narrows the light ones and lowers effective contrast. If the code is near the minimum size, dot gain is what takes it under.

Curved containers compress the pattern at the edges of the visible face. The tighter the radius, the more margin and error correction the code needs. Shrink sleeves are worse again, because the film distorts unevenly as it shrinks.

The test that matters: print on the real stock, on the real press, apply to the real container, and scan it with a handheld and a phone that have never seen the code. The QR code size guide covers the sizing rules, and the best-practices guide covers contrast and quiet zone.