Mastiff

Nothing ships unless it scans

Generate barcode and SKU labels with valid check digits, scan-check the exact PDF, then print. Presets for Dymo, Brother, Zebra and Avery.

Install free on ShopifySee how it works

200 labels a month free. No card needed. Unlimited $8.99/mo, 7-day trial.

A barcode reader scan-checking a printed label before it goes to the printerWe scan it before you print it
Scan-checked before printThe exact PDF is read back by a scanner. If it does not scan, printing stops.
Valid check digits, no duplicatesBarcodes are generated with valid check digits, and duplicates are blocked catalog-wide.
Presets for real printersDymo, Brother, Zebra and Avery, plus custom label sizes.

What it does

Four things, all of them about labels that scan.

GenerateBarcode and SKU labels with valid check digits. Duplicates are blocked catalog-wide.
Scan-checkScan-check the exact PDF before printing. Previews, test prints and reprints never count against your plan.
Purchase ordersPrint straight from a purchase-order CSV with column mapping.
Print previewPreview the exact label sheet. Presets for Dymo, Brother, Zebra, Avery plus custom sizes.

Install free on Shopify

How it works

Three steps, from catalog to printer.

Picking products and generating barcode labels in the Mastiff Barcode Labels admin

1Pick products

Choose products or variants from your catalog. Missing barcodes are generated with valid check digits.

A barcode reader scan-checking the generated label PDF

2Scan-check

The exact PDF is read back by a scanner. If a label does not scan, printing stops and the app tells you which one.

A print preview showing the label sheet with the scan check passed

3Print

Preview the exact sheet, pick your printer preset, print. Previews and reprints do not count against your plan.

Print from a purchase order

Receiving stock? Skip the catalog step.

Printing labels straight from a purchase order CSV with column mappingPurchase-order CSV with column mapping

Pricing

Start free. Upgrade when you print more.

Free

$0

200 labels a month. Enough for a small catalog and regular restocks.

  • 200 labels a month
  • Scan check on every print
  • Previews and reprints are free
Install free
Most stores

Unlimited

$8.99/mo

Unlimited labels for stores that print every week.

  • Unlimited labels
  • Everything in Free
  • 7-day free trial
Start free trial

Founders rate: first 100 stores on any Mastiff app

A permanent discount on the top plan, applied as an automatic monthly credit. We would like to hear from you: email [email protected] with your .myshopify.com domain. The credit is applied to paid plans either way.

Install free

Straight answers

Which printers does it support?

Presets cover Dymo, Brother, Zebra and Avery, plus custom label sizes. The print preview shows the exact sheet before it goes to the printer.

What if a label does not scan?

Printing stops and the app tells you which label failed, before you spend the label stock.

Do previews count against the free 200?

No. Previews, test prints and reprints are never counted against your plan.

I use Shopify's Retail Barcode Labels app. What changes?

Nothing moves: barcodes and SKUs live on your products in Shopify. Read the switching guide for the three things merchants say broke there and how this app handles each.

What if I get stuck?

Email [email protected]. We will get back to you within the same day.

Switching from Shopify's Retail Barcode Labels app

Print your first sheet today

200 labels a month free. No card.

Install free on Shopify