Guides
The background you need before putting a 2D code on a pack, written for people who are learning this category rather than people who already know the standard. No jargon we don't explain, and a primary source for anything we assert.
What is a GS1 Digital Link?
The structure behind the code: what a checkout scanner reads, what a phone reads, and which identifiers can live where.How big does a QR code need to be?
X-dimension, quiet zone and the printed sizes that follow — the GS1 figures for retail point of sale, with the source.
Working on a specific category instead? The market guides cover what the rules and the opportunities look like for food and drink, coffee, beer, wine and spirits, supplements, cosmetics and household goods. If what you actually need is a recall you can target, that has a page of its own.