Generate FNSKU barcodes and 2D Box Content Labels instantly. No login, nothing uploaded — everything runs locally in your browser.
Check your barcode route, create labels, print and test-scan.
Answer up to 5 quick questions to see which barcode route is likely to apply.
Open the checker →Generate FNSKU barcodes or 2D box content labels instantly.
Generate Amazon FNSKU BarcodePrint at 100% scale on thermal or A4, then test-scan a printed label.
Read the Print Guide →Check your Amazon FBA barcode route before creating a label. Up to 5 quick questions, no login.
Generate print-ready barcodes instantly in your browser. Nothing uploaded. No signup.
Print setup
Default setup: label printer 203 dpi, 57 × 32 mm. Choose the printer and label you actually use.
Partly used sheet with scattered gaps? Use the A4 Offset tool.
Need bulk labels? Use our Batch CSV Generator to create hundreds at once.
Not sure which type to use? Read our FNSKU vs UPC vs EAN guide.
Preview (proportional, not actual size on screen)
Your printer may not print this close to the paper edge. Print one test sheet on plain paper first.
SVG and PNG are a single label image, not a sheet. Use the PDF for a full sheet.
Build a PDF417 box content label. Runs locally in your browser. Nothing uploaded.
📖 Not sure what a 2D box label is? Read our FBA Label Size Guide.
No commas. Keep it clean and simple.
Format: PDF417 | 2D box content
freebarcodetools FBA is built by a UK-based FBA practitioner who got tired of overpriced label software that uploads your product data to third-party servers. Every tool on this site runs entirely in your browser — your SKUs, shipment IDs, and barcode data never leave your device.
I built these tools because I needed them myself. When you're prepping hundreds of units for FBA, the last thing you want is a slow web app that requires a login, stores your data, and charges per label. So I made it free, fast, and private.
Last updated October 2026 · freebarcodetools FBA team · Get in touch
Everything Amazon FBA sellers ask about barcodes and labels.
FNSKU stands for Fulfilment Network Stock Keeping Unit. It's an Amazon-assigned barcode that ties a product to your seller account. Amazon's guidance indicates you need one if you're a reseller sending new inventory to FBA (since 31 March 2026), or if the product has no manufacturer barcode. Brand Representatives may be able to use an eligible manufacturer barcode instead, if the product meets Amazon's eligibility conditions.
Yes, completely free. No account to create, no credit card, no usage limits. The tools run entirely in your browser — we don't process your data on any server. Everything happens on your own device.
UPC and EAN are global product barcodes — they identify a product universally. An FNSKU is Amazon-specific and links inventory to your seller account, letting Amazon track your stock separately from other sellers of the same product. See our FNSKU vs UPC vs EAN guide for a full breakdown with decision flow.
A 2D box content label (PDF417 barcode) tells Amazon what's inside a carton before they open it. 2D box content labels are one way to provide box content information for inbound shipments. Our 2D Box Content Builder generates them for free.
Common label problems include printing at the wrong scale (use 100% / Actual size), low print resolution (Amazon's guidance suggests a laser printer at 300 DPI for best results), original barcodes left uncovered, and labels placed over corners, edges or curves. Read our full guide: Why Amazon FBA Shipments Get Rejected.
Tools, walkthroughs, and references for Amazon FBA sellers.
Convert Amazon A4 PDFs to 4×6 thermal labels for Zebra and Rollo printers.
Generate hundreds of barcodes at once from a CSV file. Perfect for prep centres.
Which barcode do you actually need? Clear comparison and decision guide.
Fix print quality, scale, and DPI issues. Avoid Amazon rejection.
Amazon label sizes and spacing, with sources.
Understand common label problems that hold up shipments, and how to fix them.