Overview

Amazon Seller Central allows merchants to manage their product listings in bulk by uploading inventory files, also known as flat files. This process is essential for sellers who need to create, update, or delete large numbers of listings efficiently rather than editing them one at a time. Understanding the correct upload workflow helps prevent listing errors, processing delays, and potential account issues.

Key Points / What Sellers Need to Know

• Supported file formats — Amazon accepts inventory files saved as tab-delimited text (.txt) or Excel (.xls) format. Tab-delimited text is generally the more reliable option to avoid encoding issues.
• FBA-specific requirements — Sellers using Fulfillment by Amazon must follow additional instructions when uploading inventory, including specifying FBA-related fields such as fulfillment channel and shipping template.
• Template accuracy matters — Always download the most current inventory file template from Seller Central before building your file, as Amazon periodically updates required fields and valid values.
• Processing is not instant — After uploading, Amazon processes the file in the background. Sellers should check the processing report to confirm all rows were accepted.
• Error reports are essential — Every upload generates a processing report that identifies rows with errors. Reviewing this report is the only reliable way to confirm your listings were created or updated successfully.

How the Upload Process Works

To upload an inventory file, sellers navigate to the "Add Products via Upload" section within Seller Central, typically found under the Inventory or Catalog menu. From there, you select your file and submit it for processing. Amazon validates each row against its product catalog requirements, checking fields like product identifiers (UPC, EAN, ASIN), pricing, quantity, and condition. Rows that pass validation are applied to your catalog, while rows with issues are flagged in the processing report. The entire process can take anywhere from a few minutes to several hours depending on file size and system load.

File Preparation Best Practices