> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://tieback.io/docs/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://tieback.io/docs/_mcp/server. # What is GS1 Digital Link? > A vendor neutral explanation of GS1 Digital Link: why it was created, how it differs from a traditional barcode or printed URL, how one product identifier resolves to many trusted destinations, and why it underpins Digital Product Passport implementations. ## Executive Summary Most organisations understand barcodes, and most now understand [QR codes](/docs/knowledge-base/glossary/qr-code). Far fewer understand the question that sits between them and a working [Digital Product Passport](/docs/knowledge-base/glossary/digital-product-passport): how can one symbol printed on a product, years ago, in a factory, lead four different audiences to four different pieces of information, and keep working when the information moves? That is the problem [GS1 Digital Link](/docs/knowledge-base/glossary/gs1-digital-link) solves. A traditional retail barcode carries a number and nothing else. A printed web address carries a destination and nothing else. Both are fixed at the moment of printing, and both bind you to a decision you made before you knew what would be needed. Digital Link takes a third position: the symbol carries the **identifier**, expressed inside a structured web address, and a separate service called a **[resolver](/docs/knowledge-base/glossary/resolver)** decides, at the moment of scanning, which destination the requester should receive. The number never changes. The destinations can change every day. Four distinctions run through this article, because conflating them is the source of nearly all confusion in this area. **[GS1](/docs/knowledge-base/glossary/gs1)** is the neutral, not for profit standards organisation. **GS1 Digital Link** is one of its standards: a syntax plus a resolution behaviour. A **QR code** is a symbology, one of several physical carriers that can hold a Digital Link address. A **[product identifier](/docs/knowledge-base/glossary/product-identifier)** such as a GTIN is the number being carried. They are four different things and the article treats them as such. One point on legal status, stated plainly and repeated later. Digital Link is a voluntary, internationally recognised interoperability standard. It is not legally mandatory for every passport implementation. EU legislation states outcomes: a [data carrier](/docs/knowledge-base/glossary/data-carrier) linked to a unique product identifier, open standards, interoperability, machine readability and access differentiated by audience. Digital Link is a widely adopted, well documented way of satisfying those outcomes. Unless the specific instrument governing your product group names it, it is a strong engineering choice rather than a legal requirement, and you should read the instrument that applies to you rather than assuming either way. * Digital Link is a URI syntax plus a resolution behaviour. It is not a barcode, not a symbology, and not a product. - It separates **identity** from **destination**, which is the single most consequential architectural decision in passport work. - One printed symbol can serve consumers, repairers, recyclers and authorities differently, because the resolver chooses per request. - The identifier stays constant for the life of the product; destinations can be added, moved or retired without reprinting anything. - It is voluntary and widely recognised. It is a common way to meet regulatory outcomes, not a legal requirement in itself. - Printing a destination URL instead of an identifier forfeits all of this, permanently, for every unit already shipped. This is the third article in the Standards & Technology pillar and the thirteenth in the tieback Knowledge learning path. It follows [What is GS1?](/docs/knowledge-base/standards-and-technology/what-is-gs1), which introduced the identify, capture and share structure that Digital Link sits inside. Framework TBF-013 The Connected Product Identity Model Shows how a single web enabled identifier connects one product to many audiences and services. ## Table of Contents * [Definition](#definition) * [Why Traditional Barcodes Have Limitations](#why-traditional-barcodes-have-limitations) * [What is GS1 Digital Link?](#what-is-gs1-digital-link-1) * [The Connected Product Identity Model](#the-connected-product-identity-model) * [How GS1 Digital Link Works](#how-gs1-digital-link-works) * [Understanding Digital Link URLs](#understanding-digital-link-urls) * [The Role of the Resolver](#the-role-of-the-resolver) * [GS1 Digital Link and Digital Product Passports](#gs1-digital-link-and-digital-product-passports) * [Benefits for Manufacturers](#benefits-for-manufacturers) * [Benefits for Retailers](#benefits-for-retailers) * [Benefits for Consumers](#benefits-for-consumers) * [Benefits for Regulators](#benefits-for-regulators) * [GS1 Digital Link vs Traditional URLs](#gs1-digital-link-vs-traditional-urls) * [GS1 Digital Link vs QR Codes](#gs1-digital-link-vs-qr-codes) * [Common Misconceptions](#common-misconceptions) * [Frequently Asked Questions](#frequently-asked-questions) * [Key Takeaways](#key-takeaways) * [Related Articles](#related-articles) * [Related Glossary Terms](#related-glossary-terms) * [References](#references) * [About This Article](#about-this-article) ## Definition A GS1 standard that defines how identification keys are expressed inside a structured web address, so that scanning a product produces a link whose components a machine can reliably interpret, and that defines how a resolver returns different destinations for the same identifier depending on the requester's context. It is a syntax and a resolution behaviour, not a barcode symbology, not a piece of software and not a legal requirement. The five concepts below are routinely used interchangeably and are not interchangeable at all. | Concept | What it actually is | Changes over time? | | ------------------------ | ------------------------------------------------- | ---------------------------------------- | | GS1 | A neutral not for profit standards organisation | Publishes and revises standards | | GS1 Digital Link | A URI syntax plus a resolution behaviour | Versioned as a standard | | QR code | A two dimensional symbology, one possible carrier | Fixed once printed | | Product identifier | The number identifying the model, batch or item | Constant for the life of the product | | URL | The address of one specific resource | Fixed if printed; changeable if resolved | | Digital Product Passport | The maintained record about the product | Updated throughout the product lifecycle | Reading down the "changes over time" column explains the whole design. The physical carrier cannot change after printing. The identifier should never change. Everything else must be free to change. Digital Link is the arrangement that lets the changeable parts change without touching the fixed ones. ## Why Traditional Barcodes Have Limitations The linear retail barcode is one of the most successful pieces of infrastructure ever deployed, and none of what follows is a criticism of it. It was designed in the early 1970s to solve one problem extremely well: identify a sellable item at a checkout. Judged against that brief it has few equals. The limitations appear only when it is asked to do something it was never designed for. **It carries a number, and the number is all a scanner receives.** Interpreting that number requires a database, and the party scanning must already have access to the right one. A consumer with a phone has no such database. **It usually identifies a model, not a batch or an item.** Retail barcodes identify the sellable unit. Compliance evidence, composition and substance data frequently vary by production run, and a model level code cannot express that variation. **It carries no route to information.** There is no destination in a linear barcode, so the leap from "I scanned this" to "here is the safety data sheet" requires an out of band lookup that most audiences cannot perform. **Printing a web address instead solves the wrong half.** Many organisations responded by printing a URL or an unstructured QR code. That gives a destination but loses the identifier: the address is opaque, machines cannot extract which product it refers to, and the destination is frozen at the moment of printing. When the site is restructured, the campaign ends or the platform is replaced, every unit in the field points at a dead page. #### The cost of a frozen destination An appliance manufacturer printed a campaign QR code on packaging pointing to a marketing microsite with product care information. Three years later the microsite was retired during a web platform migration and the URL began returning an error. Roughly four hundred thousand units were still in homes, each carrying a permanently broken link, and there was no way to redirect them because the printed address was the only thing the symbol contained. The fix required a redirect rule maintained indefinitely on a retired domain. Had the symbol carried the identifier and resolved through a resolver, the change would have been a single entry update. #### Treating a printed URL as future proofing A printed URL is a permanent commitment made with incomplete information. It fixes the destination, the domain, the site structure and often the audience, for the entire life of every unit produced. Products routinely outlive the systems that describe them by a decade or more. The correct question is not "which page should this point at?" but "what must remain true for twenty years?", and the only safe answer is the identifier. ## What is GS1 Digital Link? Digital Link resolves the tension by carrying the identifier **as** a web address. The address is structured according to a published specification, so it is simultaneously two things: something a browser can open, and something a machine can parse to recover the exact key and value it contains. Conceptually, an address expresses the key type, the key value, and optionally further qualifiers such as a batch or a serial number, in a defined order. A general purpose scanner reading it knows it is holding a trade item number rather than a random string, and knows whether a batch or serial qualifier is present. No prior agreement with the brand owner is required, because the structure is public. Three properties follow, and they are the whole value proposition. **It is web native.** Any phone camera can open it. There is no app to install, no proprietary reader and no closed ecosystem, which matters enormously for consumer facing obligations. **It is machine interpretable.** Systems can extract the identifier from the address rather than guessing at a proprietary format, which is what makes automated processing across organisational boundaries possible. **It is resolvable rather than fixed.** The address is a request for the appropriate destination, not the destination itself. What comes back depends on rules the brand owner controls, evaluated at scan time. > **The one sentence that clarifies everything** > > A traditional QR code says "go here". A Digital Link address says "this is the product, decide > where I should go". Every other difference between the two approaches follows from that single > change of grammar. ## The Connected Product Identity Model The framework below is an original tieback model. It describes the seven layers connecting a physical object to the people who need information about it, and it exists to show precisely where Digital Link sits and what it does and does not do. The model has one governing property. Layers 1 and 2 are permanent. Layer 3 is fixed at the moment of printing. Layers 4 through 7 are free to change throughout the product's life. Digital Link is the hinge between the permanent part and the changeable part, which is exactly why it occupies the middle position. Permanent Fixed at print Changeable for life 01 Physical Product Permanent The object itself, in a warehouse, on a shelf, in a home or at a recycling facility. It carries no information of its own beyond what is marked on it. 02 Product Identifier (GTIN) Permanent A globally unique reference to the model, and where needed to the batch or the individual item. This value must never change. Everything above depends on its stability. 03 GS1 Digital Link Fixed at print The identifier expressed as a structured, web native address and encoded in a carrier. It is machine interpretable by any conforming system and openable by any phone camera. 04 Resolver Changeable The service that receives the request and decides which destination to return, based on the identifier, the declared link type, the requester's context and the operator's business rules. 05 Trusted Information Services Changeable The set of governed destinations reachable from the same identity: instructions, safety data, spare parts, repair guidance, recycling information, certification, authentication. 06 Digital Product Passport Changeable The regulated destination among those services: the maintained, audience-differentiated record of what the product is, what it contains and how it should be handled. 07 Consumers • Businesses • Regulators Point of use Different audiences, different needs, different entitlements, all arriving through the same printed symbol on the same physical product. The model's argument: GS1 Digital Link connects one physical product identity to many trusted digital resources without ever changing the product identifier itself. Layers 1 to 3 are set once and cannot be revisited; layers 4 to 7 must be free to evolve for decades. Implementations that print a destination instead of an identifier collapse the hinge at layer 3 and lose every degree of freedom above it. ## How GS1 Digital Link Works The mechanism has four steps, and none of them requires anything unusual of the person scanning. **1. Construction.** The brand owner builds an address containing the identification key and its value, in the structure the standard defines, under a domain the organisation controls or has delegated to a resolution service. Qualifiers such as a batch or serial number are appended where the required information varies at that level. **2. Encoding.** The address is encoded into a carrier, most often a QR code, but equally a DataMatrix or an RFID tag. The carrier choice is independent of the standard. **3. Scanning.** Anyone with a phone camera opens the address. There is no application to install. Industrial scanners in a warehouse read the same symbol and extract the identifier rather than opening a browser, which is how one symbol serves both consumer and operational use. **4. Resolution.** The request reaches the resolver, which examines the identifier, any declared link type, and available context, then returns the appropriate destination. The resolver's configuration can be changed at any time; the printed symbol is untouched. #### One identifier, seven destinations A single symbol on a washing machine, carrying one trade item number plus a serial qualifier, serves seven audiences from the same scan. * **Consumers.** A phone camera scan from a home returns the plain language product page: specifications, energy performance, care guidance, warranty terms. * **Repair technicians.** A registered repairer, signed in, is routed to service documentation, exploded diagrams, torque figures and diagnostic codes for the exact serial number, including any field modification applied to that unit. * **Customs authorities.** A border control officer scanning a pallet label resolves to the consignment and conformity view: importer of record, declared origin, applicable product legislation and the certificates attached to that batch. * **Market surveillance authorities.** An authenticated inspector receives the restricted passport view containing conformity documentation, substance declarations and the responsible economic operator. * **Recycling organisations.** A recycler reaches disassembly sequence, materials by mass, the location of substances of concern and the safe removal order for the battery and control board. * **Internal enterprise systems.** A warehouse scanner does not open a browser at all: it extracts the identifier from the same symbol and posts it to the inventory, traceability or quality system exactly as it would from a linear barcode. * **Product authentication.** A retailer's goods-in system checks the serialised identity against the record of issued serials and flags a duplicate or unknown value. The printed symbol is identical in all seven cases. The identifier is identical. Only the resolver's decision differs, and that decision is governed by the operator's business rules and the requester's entitlement, both of which can be revised long after the product was manufactured. Context-aware resolution is what makes this possible. When a request arrives, the resolver has three inputs available to it: the identifier itself, the link type declared in the request, and the context of the requester, which may include the preferred language, the country of the request and, where the operator requires it, an authenticated identity and entitlement. The identifier never varies. The response does. That separation is the whole point: differentiation happens at resolution time, under governance, rather than by printing different symbols for different audiences. ## Understanding Digital Link URLs A Digital Link address is readable once you know that it is built from pairs. Each pair is an identification key followed by its value, arranged in a defined order, on a domain the brand owner controls or has delegated. ```text https://example.com/01/09506000134352 https://example.com/01/09506000134352/21/SN-4471903 https://example.com/01/09506000134352/10/LOT-2026-04 https://example.com/01/09506000134352?linkType=gs1:sustainabilityInfo ``` Four parts do the work. **The domain.** The organisation's own domain, or a resolution service acting for it. This is the only part that reveals who operates resolution, and it can be migrated without changing the identity beneath it. **The primary key.** The numeric application identifier followed by its value. In these examples `01` is the trade item number, so `01/09506000134352` states the product identity and nothing more. **The qualifiers.** Optional, ordered refinements of that identity. `21` carries a serial number and `10` carries a batch or lot. A qualifier narrows the address from "this product" to "this batch" or "this individual unit", which is what allows batch-level or item-level information to be served. **The link type.** An optional request, expressed as a query parameter, for a particular kind of information rather than the default destination. It is a request, not a command: the resolver decides what the requester is entitled to receive. > **Tip** > > Read a Digital Link address as a sentence about identity, not as a filing path. `01` says which > product, `21` says which unit, and the link type says which question is being asked about it. No > part of the address states where the answer is stored, which is precisely why the answer can move. #### Encoding a destination instead of an identity A Digital Link address that reads `https://example.com/campaigns/spring-2026/product-page` is not a Digital Link address at all. It is a destination wearing the same shape. Once a destination is printed onto a product, the site structure that produced it is frozen for the life of that product. Encode the identification key and its value, and let the resolver own the destination. ## The Role of the Resolver The resolver is the component most often overlooked, and it is where the actual capability lives. Its job is narrow and important: given an identifier and a context, return the right destination. To do that it holds, for each identifier or range of identifiers, a set of registered destinations, each labelled with a **link type**, a standardised label describing what kind of resource it is, such as product information, instructions, safety information, certification, recycling guidance or a passport endpoint. A requester may ask for a specific link type; where none is requested, the resolver returns a default. Four consequences matter in practice. **Destinations become configuration, not manufacturing.** Adding a repair guide to two million units already in the field is a resolver entry, not a production change. **Access differentiation becomes possible.** Because the resolver evaluates each request, entitlement can be applied before a destination is returned. This is the mechanism by which one symbol satisfies a legal expectation that the general public, authorities and actors with a legitimate interest see different things. **Continuity survives system replacement.** When a passport platform, content management system or domain changes, the resolver entries are repointed. Products in the field keep working. **It becomes operationally critical.** A resolver stands between every scanned product and every piece of information about it. Availability, latency, change control and long-term custody are genuine obligations, not implementation details, particularly where products remain in service for decades. #### Design the resolver as long-lived infrastructure Treat the resolver with the same seriousness as the identifier it serves. Register destinations by link type rather than hard-coding one default. Keep resolver entries under change control with an audit trail, because a wrong entry silently misdirects every scan of an entire production run. Plan explicitly for custody: decide now who operates it in ten years, what happens on divestment or insolvency, and how entries would be migrated to another operator without reprinting products. Finally, monitor it as a public service, a resolver that is down is a product with no information, and for a regulated passport that may be a compliance failure rather than an outage. ## GS1 Digital Link and Digital Product Passports Passport legislation asks for a set of properties that map unusually cleanly onto what Digital Link provides, which is why adoption is growing, and also why the relationship is frequently misdescribed as a mandate. | Regulatory expectation | What Digital Link contributes | | ------------------------------------------------------------ | ------------------------------------------------------------------------- | | A data carrier linked to a unique product identifier | The carrier holds the identifier itself rather than an opaque destination | | Access differentiated by audience | The resolver decides per request, so one symbol serves several audiences | | Based on open standards, interoperable and machine readable | The syntax is public and parseable by any conforming system | | Data available for a defined period after placing on market | Destinations can be repointed as systems change, without reprinting | | Information reachable by the general public without barriers | Web native and openable by any phone camera, with no application required | What Digital Link does **not** do is equally important. It does not determine what a passport must contain, does not create or validate the content, does not assign legal responsibility for accuracy, and does not itself constitute compliance. Those are set by the legislation applying to the product group and by product law generally. See [What Information Does a Digital Product Passport Contain?](/docs/knowledge-base/digital-product-passports/what-information-does-a-digital-product-passport-contain) and [How Does a Digital Product Passport Work?](/docs/knowledge-base/digital-product-passports/how-does-a-digital-product-passport-work). On legal status, stated once more because it is regularly overstated in the market: EU legislation expresses requirements as outcomes and open standards rather than by naming a standards body or a particular specification. Digital Link is a voluntary, globally recognised interoperability standard that is widely used to meet those outcomes. Whether it is required for your products depends on the [delegated act](/docs/knowledge-base/glossary/delegated-act) or sector instrument that applies, and that document is the only authority on the point. See [What is ESPR?](/docs/knowledge-base/regulations/what-is-the-ecodesign-for-sustainable-products-regulation-espr) and [How Will Digital Product Passports Change Product Compliance?](/docs/knowledge-base/standards-and-technology/how-will-digital-product-passports-change-product-compliance). Organisations adopt it for reasons that hold regardless of legal status: the identity layer often already exists, the approach is documented and neutral, trading partners and retail systems increasingly recognise it, and the alternative, a private scheme, must recreate parsing rules, resolution behaviour and partner agreements from scratch while offering no interoperability in return. ## Benefits for Manufacturers * **One symbol serves every audience**, removing the pressure to add a second or third code to packaging for repair, recycling or compliance information. * **Destinations become editable after production**, so content restructuring, platform migration and new information services no longer require artwork changes. * **Batch and serial level routing**, allowing information that genuinely varies by production run or by unit to be delivered accurately rather than approximated at model level. * **Field actions become precise**, because a serialised identity allows affected units to be addressed specifically rather than by broad model recall. * **Identity outlives systems**, which matters when [product lifecycles](/docs/knowledge-base/glossary/product-lifecycle) run to fifteen or twenty years and platform lifecycles run to five. * **A single integration pattern** replaces per-partner arrangements for connecting products to information. ## Benefits for Retailers * **Consistent product identity across channels**, since the same key underpins shelf, warehouse, online listing and consumer scan. * **Richer consumer experience without extra packaging**, as one symbol can lead to more than a price lookup. * **Faster supplier onboarding**, because a standard structure removes the negotiation over link formats. * **Support for withdrawal and recall precision**, where serialised or batch-qualified scans identify affected stock instead of clearing a whole line. * **Reduced dead links in store estates**, since destinations are managed centrally rather than frozen on printed materials. * **Automated verification at goods-in**, using the same symbol operationally that consumers use informationally. ## Benefits for Consumers * **A scan that works with the phone they already have**, with no application to install and no account to create. * **Information about the item in hand**, including its batch or serial where relevant, rather than a generic model page. * **Access to repair, spare parts and disposal guidance**, which supports keeping a product rather than replacing it and feeds the [circular economy](/docs/knowledge-base/glossary/circular-economy). * **Links that keep working years later**, because the resolver can be updated as content moves. * **Claims that can be checked**, since a maintained record from an identified responsible party is materially different from a statement printed on a box. * **A route to authenticity checking** where the manufacturer offers it, which matters for products with a counterfeit problem. ## Benefits for Regulators * **A consistent, machine readable route from a physical product to its record**, without needing a relationship with each manufacturer first. * **Entitlement-aware access**, so authority-only material such as conformity documentation can be delivered through the same symbol the public uses. * **Support for [market surveillance](/docs/knowledge-base/glossary/market-surveillance) at the point of inspection**, where an officer with a phone can reach the responsible [economic operator](/docs/knowledge-base/glossary/economic-operator) and the relevant [conformity assessment](/docs/knowledge-base/glossary/conformity-assessment) evidence. * **Comparability across manufacturers**, because a shared structure means the retrieval method does not vary by brand. * **Traceability of what was published when**, supporting the evidentiary needs of enforcement. * **Lower burden on legitimate operators**, since a standard route reduces the volume of ad hoc information requests. ## GS1 Digital Link vs Traditional URLs Both are web addresses. That is where the similarity ends. | Property | Traditional printed URL | GS1 Digital Link | | ---------------------------- | --------------------------------------------- | -------------------------------------------------------- | | What it encodes | A destination | An identifier, expressed as an address | | Machine interpretability | Opaque; structure is private to the publisher | Structured; any conforming system extracts the key | | Number of destinations | One, fixed at print | Many, selected by link type and context | | Audience differentiation | Not possible without separate printed codes | Native, through resolution | | Behaviour when content moves | Breaks, permanently, for units in the field | Continues, after a resolver entry update | | Batch or serial granularity | Requires a distinct URL per batch or unit | Expressed as qualifiers on the same identifier structure | | Cost of change | A print run | A configuration change | The practical summary: a traditional URL is a decision you can never revisit, and a Digital Link address is a decision you can revisit indefinitely. For a product with a two year commercial life this is an inconvenience. For a product that will be repaired in 2040, it is the difference between a working passport and a dead one. ## GS1 Digital Link vs QR Codes This comparison is the most common category error in the subject, so it is worth being blunt: these are not alternatives. They operate at different layers and are typically used together. A **QR code** is a symbology, a way of encoding characters into a printable two dimensional pattern. It says nothing about what those characters mean. **GS1 Digital Link** is a specification for what the characters should be and how a request for them should be answered. It says nothing about how they are printed. | Question | QR code | GS1 Digital Link | | ------------------------------- | ----------------------------------------- | --------------------------------------------- | | What kind of thing is it? | A data carrier symbology | A URI syntax and resolution behaviour | | What does it define? | How characters are encoded into a pattern | What the characters mean and how they resolve | | Can it exist without the other? | Yes, a QR code can hold any text | Yes, it can be carried in DataMatrix or RFID | | Where is it fixed? | At printing | Resolution is changeable at any time | A QR code containing an ordinary marketing URL is a QR code and nothing more. A QR code containing a Digital Link address is a QR code carrying a standardised, resolvable product identity. The symbol looks the same to a human and behaves completely differently. #### Saying 'we already use QR codes, so we have Digital Link' Having QR codes on packaging tells you the carrier decision is solved. It says nothing about what those codes contain. If they hold campaign URLs, they carry no extractable identifier, cannot be interpreted by a partner's system, cannot serve differentiated audiences and will break when the target moves. The carrier was never the hard part; what the carrier contains is. ## Common Misconceptions * **"A QR code is a Digital Product Passport."** A QR code is a carrier: a printed pattern that holds characters. GS1 Digital Link is the standard governing what those characters say, the GTIN is the identifier they carry, the resolver connects that identifier to digital resources, and the passport is the maintained record at the end of that chain. Four distinct things. * **"GS1 Digital Link is a type of QR code."** It is a URI syntax and resolution behaviour. It can be carried in a QR code, a DataMatrix or an RFID tag. * **"It is legally required for Digital Product Passports."** It is a voluntary standard. Legislation states outcomes; Digital Link is a widely used way of meeting them, unless a specific instrument names it. * **"It replaces the barcode."** Both can coexist on the same pack during transition, and the identifier inside a Digital Link address is typically the same number the barcode already carries. * **"It changes our product identifiers."** It changes how identifiers are expressed and resolved, not what they are. The number is unchanged. * **"GS1 hosts our resolver and controls our data."** Resolution can be operated by the brand owner, by a service provider or by a member organisation's service. GS1 is a standards body; it is not a hosting requirement and it does not own your content. * **"The resolver is a technical detail."** It is the component that makes differentiated access and long-term continuity possible. Treat it as infrastructure. * **"A Digital Link address is a passport."** It is the route to one. The [passport](/docs/knowledge-base/digital-product-passports/what-is-a-digital-product-passport) is the maintained record, which is separate work. * **"Adopting it locks us into one vendor."** The point of a public standard is the opposite: because the syntax and resolution behaviour are documented and neutral, a resolver operator can be replaced without touching products in the field. ## Frequently Asked Questions #### Is GS1 Digital Link mandatory for a Digital Product Passport? Not inherently. EU legislation expresses requirements as outcomes: a data carrier linked to a unique identifier, open standards, interoperability, machine readability and differentiated access. Digital Link is a globally recognised way of satisfying those outcomes and is widely adopted for that reason, but it is a voluntary standard. Whether it is required for your products depends on the delegated act or sector instrument that applies, and that document is the authority. #### Do we have to stop using our existing barcodes? No. Linear barcodes remain essential at retail point of sale, and transition periods assume both will coexist on packaging for some time. The identifier inside a Digital Link address is normally the same trade item number the existing barcode already carries, so this is an addition rather than a replacement. #### What exactly is a resolver, and must we operate one ourselves? A resolver is the service that receives a scanned identifier and returns the destination appropriate to the requester. You need resolution behaviour of some kind if you intend to serve different audiences from one symbol or to change destinations without reprinting. Whether you operate it, use a service provider or use a member organisation's service is a commercial and operational decision, not a standards one. #### Can one symbol really serve consumers, repairers, recyclers and regulators? Yes, and that is the primary reason organisations adopt it. The resolver registers several destinations against the same identifier, each labelled with a link type, and applies the operator's rules and the requester's entitlement to decide which is returned. The printed symbol is identical for all of them. #### What happens if the resolver goes down or the company ceases trading? Scans stop returning information, which for a regulated passport may be a compliance issue rather than an outage, so availability, monitoring and change control are genuine obligations. Long-term custody should be planned explicitly: decide who operates resolution in a decade, and how entries would transfer to another operator. Because the products carry identifiers rather than destinations, such a transfer is possible without reprinting anything. #### Does it work at batch or serial level, or only per model? It supports qualifiers, so a batch or a serial value can be expressed alongside the trade item number in the same structure. Which level you need is a business decision driven by whether the required information varies between production runs or between individual units. Compliance evidence and composition frequently vary by batch. #### Is it only relevant to consumer retail products? No. The pattern applies wherever a physical object needs to lead to information held elsewhere, including components, industrial equipment, construction products and spare parts. The consumer scan is the most visible use, not the only one. #### Where should we start if we want to adopt it? Establish which identification level each product family requires, confirm that identifiers are allocated and governed reliably at that level, then decide how resolution will be operated and which link types you will register. The identification work is almost always the longer task; see [How Should Organisations Prepare for Digital Product Passports?](/docs/knowledge-base/implementation/how-should-organisations-prepare-for-digital-product-passports). ## Key Takeaways * GS1 Digital Link expresses a product identifier as a structured web address, and defines how a resolver answers requests for it. - Keep four things separate: GS1 the organisation, Digital Link the standard, the QR code as a carrier, and the identifier as the number being carried. - The central idea is separating identity from destination: the number is permanent, the destinations are configuration. - One printed symbol can serve consumers, repairers, recyclers, retailers and authorities differently, because the resolver decides per request. - The resolver is infrastructure, not a detail. Availability, change control and long-term custody are real obligations. - A printed URL is a permanent commitment; a Digital Link address is a revisable one. Products outlive the systems that describe them. - It is a voluntary, globally recognised interoperability standard, not a legal requirement in itself. Read the instrument that applies to your products. - It is the route to a passport, not the passport. The content, its accuracy and the responsibility for it are separate work. ## Related Articles * [QR Codes vs GS1 Digital Link: What's the Difference?](/docs/knowledge-base/standards-and-technology/qr-codes-vs-gs1-digital-link) * [What is GS1?](/docs/knowledge-base/standards-and-technology/what-is-gs1) * [What is a GTIN?](/docs/knowledge-base/standards-and-technology/what-is-a-gtin) * [What is a Data Carrier?](/docs/knowledge-base/standards-and-technology/what-is-a-data-carrier) * [How Product Data Moves Through the Supply Chain](/docs/knowledge-base/standards-and-technology/how-product-data-moves-through-the-supply-chain) * [What is EPCIS?](/docs/knowledge-base/standards-and-technology/what-is-epcis) * [GS1 Digital Link](/docs/knowledge-base/glossary/gs1-digital-link) * [Resolver](/docs/knowledge-base/glossary/resolver) ## Related Glossary Terms Definitions of record for the terms used above live in the [glossary](/docs/knowledge-base/glossary/overview). * [GS1 Digital Link](/docs/knowledge-base/glossary/gs1-digital-link) * [GS1](/docs/knowledge-base/glossary/gs1) * [QR Code](/docs/knowledge-base/glossary/qr-code) * [Data Carrier](/docs/knowledge-base/glossary/data-carrier) * [Product Identifier](/docs/knowledge-base/glossary/product-identifier) * [Digital Product Passport](/docs/knowledge-base/glossary/digital-product-passport) * [ESPR](/docs/knowledge-base/glossary/espr) * [Delegated Act](/docs/knowledge-base/glossary/delegated-act) * [Economic Operator](/docs/knowledge-base/glossary/economic-operator) * [Market Surveillance](/docs/knowledge-base/glossary/market-surveillance) * [Conformity Assessment](/docs/knowledge-base/glossary/conformity-assessment) * [Product Data](/docs/knowledge-base/glossary/product-data) * [Product Traceability](/docs/knowledge-base/glossary/product-traceability) * [Product Lifecycle](/docs/knowledge-base/glossary/product-lifecycle) * [Sustainability Data](/docs/knowledge-base/glossary/sustainability-data) * [Circular Economy](/docs/knowledge-base/glossary/circular-economy) ## References * GS1 Digital Link standard, the primary specification for syntax and resolution: [https://www.gs1.org/standards/gs1-digital-link](https://www.gs1.org/standards/gs1-digital-link) * GS1, the global standards organisation: [https://www.gs1.org](https://www.gs1.org) * GS1 General Specifications, defining keys, carriers and application identifiers: [https://www.gs1.org/standards/barcodes-epcrfid-id-keys/gs1-general-specifications](https://www.gs1.org/standards/barcodes-epcrfid-id-keys/gs1-general-specifications) * GS1 identification keys, including GTIN and its qualifiers: [https://www.gs1.org/standards/id-keys](https://www.gs1.org/standards/id-keys) * GS1 two dimensional barcodes and the industry transition to 2D carriers: [https://www.gs1.org/standards/barcodes/2d](https://www.gs1.org/standards/barcodes/2d) * GS1 web vocabulary, including link types used in resolution: [https://www.gs1.org/voc/](https://www.gs1.org/voc/) * Regulation (EU) 2024/1781 establishing a framework for the setting of ecodesign requirements for sustainable products, including the Digital Product Passport and data carrier provisions, Official Journal of the European Union: [https://eur-lex.europa.eu/eli/reg/2024/1781/oj](https://eur-lex.europa.eu/eli/reg/2024/1781/oj) * Regulation (EU) 2023/1542 concerning batteries and waste batteries, including the battery passport and its identifier provisions, Official Journal of the European Union: [https://eur-lex.europa.eu/eli/reg/2023/1542/oj](https://eur-lex.europa.eu/eli/reg/2023/1542/oj) * European Commission, Ecodesign for Sustainable Products Regulation: [https://commission.europa.eu/energy-climate-change-environment/standards-tools-and-labels/products-labelling-rules-and-requirements/ecodesign-sustainable-products-regulation\_en](https://commission.europa.eu/energy-climate-change-environment/standards-tools-and-labels/products-labelling-rules-and-requirements/ecodesign-sustainable-products-regulation_en) * EUR-Lex, official portal for European Union law: [https://eur-lex.europa.eu](https://eur-lex.europa.eu) * World Wide Web Consortium, on URIs and web architecture: [https://www.w3.org](https://www.w3.org) ## About This Article About This Article
Last Reviewed
2026-08-07
Next Scheduled Review
2027-08-07
Article Version
1.0
tieback Knowledge is a continuously maintained reference library covering Digital Product Passports, product traceability, product compliance and related regulations. Articles are reviewed regularly as legislation, standards and implementation guidance evolve. ## Related Docs * [Standards & Technology](/docs/knowledge-base/standards-and-technology/overview) * [What is GS1?](/docs/knowledge-base/standards-and-technology/what-is-gs1) * [What is a Digital Product Passport?](/docs/knowledge-base/digital-product-passports/what-is-a-digital-product-passport) * [How Does a Digital Product Passport Work?](/docs/knowledge-base/digital-product-passports/how-does-a-digital-product-passport-work) * [How Will Digital Product Passports Change Product Compliance?](/docs/knowledge-base/standards-and-technology/how-will-digital-product-passports-change-product-compliance) * [What is the Ecodesign for Sustainable Products Regulation (ESPR)?](/docs/knowledge-base/regulations/what-is-the-ecodesign-for-sustainable-products-regulation-espr) * [Who Is Legally Responsible for a Digital Product Passport?](/docs/knowledge-base/regulations/who-is-legally-responsible-for-a-digital-product-passport) * [Building an Enterprise Digital Product Passport Architecture](/docs/knowledge-base/enterprise-systems-and-data-architecture/building-an-enterprise-digital-product-passport-architecture)