GS1 Digital Link

GS1 Digital Link is a URL-based encoding for product identity that replaces the 50-year-old 1D EAN-13 barcode. One QR carries the GTIN plus batch, expiry, serial, and a resolvable marketing URL — scanned at POS by the retailer and in the consumer's phone camera by the shopper.

Canonical spec: GS1 Digital Link Standard v1.4.1 (published 2024-06).
Supersedes: Regular EAN-13 at POS by 1 January 2027 under the GS1 Sunrise 2027 retail-industry commitment.

What it is

A GS1 Digital Link URL has three parts:

Resolver domain — where the URL is resolved. Brands use their own (e.g. id.example-brand.com); the public fallback is id.gs1.org.
Primary identifier — usually the GTIN, encoded as /01/<14-digit GTIN>.
Qualifiers / attributes — optional Application Identifiers (AIs): batch/lot (/10/), expiry date (/17/), serial (/21/), and others.

Example resolved URL for a GTIN 09506000134352, lot ABC123, expiry 2027-06-30:

https://id.gs1.org/01/09506000134352/17/270630/10/ABC123

Canonical test vectors

Copy any of these into the GS1 generator, confirm the encoded URL matches, and decode the QR with any reader.

Case	Inputs	Expected encoded URL
GTIN-14, minimal	`gtin=09506000134352`	`https://id.gs1.org/01/09506000134352`
GTIN + expiry (AI 17)	`gtin=09506000134352 expiry=2027-06-30`	`https://id.gs1.org/01/09506000134352/17/270630`
GTIN + lot (AI 10)	`gtin=09506000134352 lot=ABC123`	`https://id.gs1.org/01/09506000134352/10/ABC123`
GTIN + lot + serial	`gtin=09506000134352 lot=ABC123 serial=00001`	`https://id.gs1.org/01/09506000134352/10/ABC123/21/00001`
Full: GTIN + expiry + lot + serial	`gtin=09506000134352 expiry=2027-06-30 lot=ABC123 serial=00001`	`https://id.gs1.org/01/09506000134352/17/270630/10/ABC123/21/00001`
Custom resolver domain	`domain=https://id.example.com gtin=09506000134352`	`https://id.example.com/01/09506000134352`

Live GTIN check-digit validator

GS1 check digit is computed by the standard GS1 mod-10 algorithm: weighted sum of digits (alternating 3, 1, 3, 1…) from the rightmost digit, then the check digit makes the total a multiple of 10. Try any 8/12/13/14-digit input below — the validator runs locally in your browser.

GTIN (8, 12, 13, or 14 digits)

Enter a GTIN to validate.

Common pitfalls

Wrong check digit. If the last digit of your GTIN is wrong, POS scanners will reject the code. The validator above catches this in-browser. Never hand-edit a GTIN without re-computing the check digit.
Date format. GS1 expiry (AI 17) is YYMMDD, not YYYY-MM-DD. A 2030-03-01 expiry is 300301. Hand-editing a 10-digit date into the URL breaks decoders.
Lot characters. AI 10 (lot) is a variable-length alphanumeric field capped at 20 characters. Some legacy scanners fail on the / character in a lot code — if your factory numbering uses slashes, escape as %2F.
Serial uniqueness. AI 21 (serial) combined with AI 01 (GTIN) must be unique within your brand. If two identical serials hit the resolver, the GS1 resolver returns the last-registered target — usually not what you want.
Resolver domain fallback. If your brand domain isn't reachable (DNS outage, SSL expiry), the consumer's scan fails. Register with the public id.gs1.org resolver as a fallback.
GTIN-12 (UPC-A) padding. A US UPC-A is 12 digits. In GS1 Digital Link, it's padded to a 14-digit GTIN by prepending two zeros. Abundera handles this automatically; custom encoders often don't.

Scanner compatibility

Scanner	Support	Notes
iOS Camera (iOS 15+)	Yes	Opens the resolved URL in Safari. No GS1 awareness — it's just a URL.
Android Camera	Yes	Same as iOS — treats the payload as a URL.
Retail POS (Honeywell, Zebra, Datalogic)	Yes (firmware-dependent)	Modern firmware (2023+) parses the Digital Link and extracts GTIN + qualifiers into the POS inventory system.
Older retail POS	Partial	Older imager firmware reads the URL but doesn't parse AIs. Pair with a complementary EAN-13 barcode during the 2025–2027 transition.
Google Lens	Yes	Recognises GS1 Digital Link URLs and can display product info inline.

Sunrise 2027 timeline

Now → 2026: Pair GS1 Digital Link with EAN-13 on-pack during the migration window. Retailers accept both.
1 January 2027: Retailers commit to scanning 2D Digital Link codes at POS. Legacy EAN-13 continues to work but becomes optional.
Post-2027: 2D Digital Link becomes the primary product code. EAN-13 gets phased out as scanner fleets complete refresh.