Selling on Amazon means barcodes everywhere: FNSKU labels on every unit sent to FBA, GTINs for your listings, and carton labels for your inbound shipments. A free barcode generator for Amazon sellers lets you print all of these in bulk — no expensive label software, no per-label fees, no waiting on a print shop. Paste your codes, generate up to 500 barcodes per batch, and stick them on the same day.
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Why Amazon Sellers Need Barcodes
Amazon’s fulfillment system runs on barcodes. Get them right and your inventory flows; get them wrong and shipments get delayed, mis-sorted, or rejected at the warehouse dock.
FBA requires scannable unit labels. Every unit you send to a fulfillment center needs an FNSKU barcode (unless you are approved for manufacturer-barcode commingling). Amazon scans these on receipt — a label that will not scan holds up your entire shipment.
Listings need valid GTINs. Most product listings require a GTIN (usually a UPC or EAN) to create or match a listing. Printing the matching barcode for your packaging keeps your physical product consistent with your catalog data.
Carton labels speed up check-in. Properly labeled cartons move through Amazon’s receiving process faster. The right carton barcode, printed clearly, means fewer receiving delays and fewer “problem shipment” emails.
Reprints cost nothing. Labels get damaged in transit, printers jam, and quantities change. Generating replacements instantly — for free — beats reordering from a label vendor every time.
Which Barcode Type Should You Use?
Amazon uses different barcode types for different jobs. Match the symbology to the label:
Code 128 — for FNSKU labels. Amazon issues FNSKU codes (typically starting with X0) as alphanumeric strings, and Code 128 is the standard symbology for printing them. It encodes the full FNSKU compactly on a small unit label. Generate them with our bulk Code 128 barcode generator — and see the complete Code 128 guide if you are new to the format.
UPC-A / EAN-13 — for GTINs on packaging. If your product packaging carries the retail barcode matching your listing’s GTIN, use UPC-A (US listings) or EAN-13 (most other marketplaces). Print them with the bulk UPC barcode generator or bulk EAN-13 barcode generator. Not sure which your listing needs? Our UPC-A vs UPC-E vs EAN-13 comparison sorts it out.
ITF-14 — for outer cartons. Multi-unit cartons heading to the fulfillment center scan best with ITF-14, the standard for corrugated packaging. Use the bulk ITF-14 barcode generator for your shipping cartons.
How to Generate Barcodes in Bulk (Step by Step)
Step 1 — Export your codes from Seller Central. Download your FNSKU list from your FBA shipment workflow, or collect the GTINs for your listings. Put one code per row in a spreadsheet — no spaces, no extra characters. Our Excel/CSV bulk barcode guide covers the exact formatting Amazon codes need.
Step 2 — Paste or import into the tool. Copy the code column into the input panel or upload your CSV. The entry counter confirms the count — up to 500 barcodes per batch, free, no signup. A typical FBA shipment’s labels fit in one or two batches.
Step 3 — Select the right symbology. Choose Code 128 for FNSKU unit labels, UPC-A/EAN-13 for GTIN packaging barcodes, ITF-14 for cartons. Set the size to match Amazon’s label requirements — FNSKU labels are usually small (around 1″ × 2″), so keep bars compact but scannable.
Step 4 — Generate and test-scan. Preview the batch and scan a sample with your phone. Amazon’s warehouse scanners are industrial-grade, but a quick self-check catches formatting mistakes before you print hundreds of labels.
Step 5 — Download and print. Export as PDF for label sheets, or download a ZIP of PNG files for your thermal printer software. All processing happens in your browser — your FNSKU list is never uploaded anywhere.
Tips for Amazon Seller Barcodes
Cover old barcodes completely. Amazon requires each unit to show only one scannable barcode. If the manufacturer’s barcode is still visible, your FNSKU sticker must cover it fully — a partial cover causes mis-scans and receiving errors.
Print FNSKU labels at the right size. Too small and the warehouse scanner struggles; too large and the sticker wraps around curved packaging. Test one label on your actual product before printing the batch.
If you pack at home, read how to print barcode labels at home before your first shipment.
Use white, matte label stock. Glossy labels reflect scanner light and cause failed reads. Plain white matte stickers give the most reliable scans at Amazon’s receiving docks.
Keep a label archive per shipment. Save the code list and the generated PDF for every FBA shipment. If Amazon flags a receiving problem weeks later, you can prove exactly which labels went on which units.
Frequently Asked Questions
What barcode format does Amazon FBA require for unit labels?
Amazon FNSKU labels are printed as Code 128 barcodes. Each unit in an FBA shipment needs its own scannable FNSKU label (unless you use stickerless commingled inventory, which requires approval).
Can I print FNSKU labels for free?
Yes. Export your FNSKU codes from Seller Central, paste them into the free tool above, and print up to 500 labels per batch. Amazon also offers label printing inside Seller Central, but generating them yourself is faster for large shipments and gives you more size control.
What is the difference between FNSKU, UPC, and GTIN?
The FNSKU is Amazon’s internal identifier for your specific seller listing — it goes on the unit label for FBA. The UPC/EAN (a type of GTIN) is the global retail identifier tied to the product itself and printed on packaging. You often need both: GTIN for the listing, FNSKU for the FBA unit.
Will these barcodes scan at Amazon fulfillment centers?
Yes — the tool generates standard, spec-compliant Code 128, UPC, EAN-13, and ITF-14 symbols that industrial scanners read. Print on matte white stock and test-scan before your full print run.
Is my FNSKU list uploaded or stored anywhere?
No. Barcode generation runs entirely in your browser. Your seller data never leaves your device, and nothing is stored on our servers.