what size barcode labels for amazon fba are generally the same size as Amazon FBA labels, which is 4 inches by 6 inches. The barcode must be clear and scannable to ensure that Amazon’s system can track and manage inventory accurately. Barcode labels can be generated directly from Amazon Seller Central, and they need to be placed on each individual product in a manner that complies with Amazon’s labeling requirements. Proper labeling helps avoid potential issues during shipping and product storage.