Stop getting rejected.
Start selling on Amazon, Google & Walmart.

Assign real, GS1-verified UPC and EAN barcodes to your Shopify products, without leaving your store. No fake codes, no spreadsheet chaos. Valid GTINs that actually get your listings approved.

Install on Shopify, Free Trial Watch the Demo

★★★★★ 4.9/5 on Shopify App Store · 10 reviews · Free plan available

✓ GS1 Verified 200+ GS1 Orgs Auto-Assign

Direct GS1 connections

GS1 US GS1 Germany GS1 Sweden GS1 Netherlands GS1 Brazil

Sell Everywhere

One of the few barcode apps that meets Shopify’s Built for Shopify quality standard.

4.9/5 App Store rating

100,000+ Products & variants per store

200+ GS1 member organizations

5 Direct API connections

Why Merchants Switch

There’s a better way to manage your barcodes

Spreadsheets, GS1 portals, manual data entry. It costs you time and it costs you listings. Manage everything inside Shopify instead.

The Old Way

✕ Copy-paste from GS1 portal into Shopify, one at a time
✕ Manually cross-reference codes on GS1 websites
✕ Eyeball your spreadsheet and hope for the best
✕ Get rejected, then guess what went wrong
✕ Log into your GS1 portal separately
✕ Remember to assign a barcode every time

With GS1 Assistant

✓ Select products, click Assign. Done in seconds.
✓ Real-time GTIN validation built into the dashboard
✓ Automatic duplicate detection across your entire catalogue
✓ See how Amazon and Google view your barcodes before you list
✓ Your full prefix block visible inside Shopify
✓ Shopify Flow auto-assigns GTINs to new products (Pro plan)

Capabilities

The tools your barcodes actually need

Assign, validate, and export. All inside Shopify, all from your own GS1 prefix.

GTIN Manager Dashboard

See every product’s barcode status at a glance: Assigned/Unassigned, Valid/Invalid, and Duplicates. Find problems before marketplaces do.

Bulk & Auto Assign

Assign GTINs to your entire catalogue in batches. Connect Shopify Flow to auto-assign when new products are created (Pro plan).

Real-Time GS1 Verification

Every barcode is validated against GS1’s official registry before assignment, correct before Amazon or Google see it.

Marketplace Export Files

Download spreadsheets formatted for Amazon Seller Central, Google Merchant Center, GS1 portals, and wholesale buyers.

Duplicate & Error Detection

Catch duplicate GTINs, invalid check digits, and barcodes that don’t belong to you, before they cause rejections.

GS1 Registry Connection & Export

Connect via API (GS1 Germany, Sweden, Netherlands, Brazil) or export ready-to-upload spreadsheets for any region.

Get Started

Three steps. That’s it.

You don’t need technical knowledge. If you have a GS1 Company Prefix, you’re ready.

Enter your GS1 Company Prefix. The app auto-detects your region and shows available barcodes.

Select products and click Assign. One product or hundreds. The app pulls the next codes from your prefix.

List on Amazon, Google Shopping, Walmart, or wholesale, with valid, GS1-verified barcodes.

Social Proof

What merchants actually say

Rated 4.9/5 on the Shopify App Store with 10 reviews.

UCHÈ Fashion BrandUSA
★★★★★

“The best thing available for GS1 code management. We have no prior knowledge and the app makes it extremely easy to navigate the complex world of EANs, GTINs etc. Support is also 5 stars.”

Grunt Style, LLCUSA
★★★★★

“An incredibly helpful and time-saving tool! It takes the guesswork out of product identification and helps ensure everything is formatted and validated correctly.”

JESSICA RICHUSA
★★★★★

“GS1 Assistant has made managing UPC codes effortless. Assigning GTINs is simple, and products appear in Verified by GS1 shortly after.”

Infantium VictoriaGermany
★★★★★

“I needed urgently to create GTIN codes for our older stock (600 SKUs). This app saved me 2 days of work!”

UniqfindCanada
★★★★★

“A must-have for any Shopify store managing UPC, EAN, or GTIN barcodes. Accurate assignments without duplicates. Great sync with my GS1 prefix.”

Product Demo

See GS1 Assistant in action

Watch how merchants assign and verify barcodes inside Shopify in minutes.

Start free. Upgrade when you need to.

No hidden fees. Cancel anytime.

Monthly Annual Save up to 24%

Free

$0 /mo

Up to 20 GTIN assignments

✓ GTIN Validation (Format & Check Digit)
✓ GTIN Status Visibility (OK/Discontinued)
✓ Duplicate GTIN Detection
✓ Verified by GS1 Status & Details
✓ Manage Your Company Prefixes
✓ Multiple Region Export Format Support
✓ API Access (where supported)

Get Started

Basic

$4.99 /mo $49.99 /yr

$49.99/yr (save 17%) $4.17/mo equivalent

Up to 500 GTIN assignments

✓ GTIN Validation (Format & Check Digit)
✓ GTIN Status Visibility (OK/Discontinued)
✓ Duplicate GTIN Detection
✓ Verified by GS1 Status & Details
✓ Manage Your Company Prefixes
✓ Multiple Region Export Format Support
✓ API Access (where supported)

Start Free Trial

Common questions before you install

Do I need a GS1 Company Prefix before I install?

Yes. GS1 Assistant uses your GS1 Company Prefix to assign valid barcodes. The app doesn’t sell or generate its own codes. If you don’t have a prefix yet, purchase one from your local GS1 member organization. US merchants can also purchase directly through the app.

Will this fix my Amazon or Google Shopping GTIN rejections?

If rejections are caused by invalid, mismatched, or missing GTINs, yes. Amazon and Google validate barcodes against GS1’s global registry. GS1 Assistant assigns codes from your own prefix and checks them in real time.

What’s the difference between UPC, EAN, and GTIN?

They’re the same numbering system at different lengths. UPC is 12-digit (North America). EAN is 13-digit (Europe and global). GTIN is the umbrella term. GS1 Assistant handles all of them.

Does it work with GS1 organizations outside the US?

Yes. Direct API integration is available for GS1 Germany, Sweden, Netherlands, and Brazil. All other regions are supported via export files.

What happens to my barcodes if I uninstall the app?

GTINs already assigned stay in Shopify’s barcode fields. Uninstalling doesn’t remove or change your product data.

My products already have barcodes. Can I still use GS1 Assistant?

Yes. The app scans existing barcodes and shows validity status. You can bulk-unassign invalid ones and assign GTINs from your own prefix.

Is this different from buying cheap barcodes online?

Yes. Reseller barcodes aren’t registered to your company. Marketplaces check ownership. Mismatched GTINs get rejected. GS1 Assistant only uses codes from your own GS1 Company Prefix.

How many products can the app handle?

GS1 Assistant supports catalogues of 20,000+ variants. One merchant assigned GTINs to 600 SKUs and saved two days of manual work.

Your barcodes should work. Let’s make sure they do.

Every invalid GTIN is a rejected listing waiting to happen. GS1 Assistant gets your barcodes right so you can focus on selling.
Questions? Real humans answer them, usually the developer himself.

Install on Shopify, Free Trial Watch the Demo

Free plan available · Built for Shopify certified · Cancel anytime

Stop getting rejected.
Start selling on Amazon, Google & Walmart.

There’s a better way to manage your barcodes