Why does Amazon require UTF-8 CSV instead of Excel files?

Amazon's bulk upload system is built to process plain text files, not Excel workbooks. UTF-8 CSV is encoding-explicit, which allows Amazon's systems to correctly interpret special characters in product titles, descriptions, and brand names across all marketplaces.

Will pricing formulas in my Excel file export as correct numeric values?

Yes. All formulas are resolved to their computed values before export. A cell containing a markup formula that evaluates to 24.99 will export as 24.99 in the CSV — the value Amazon's price feed expects.

Can I convert Amazon inventory reports I downloaded from Seller Central?

Yes. Reports downloaded from Seller Central as .xlsx files are standard Excel workbooks and convert normally. This is useful for bulk editing — download, modify in Excel, convert to CSV, re-upload.

Does this work for both .xlsx and older .xls files?

Yes. Both formats are supported. Some older repricing tools and third-party software still export .xls files, and these convert with the same behavior as modern .xlsx workbooks.

What if my product catalog is organized across multiple sheets by category?

Only the first worksheet is exported. Consolidate the listings you want to upload onto the first sheet before converting, or process each category sheet as a separate file.

Excel to CSV for Amazon Sellers: Prepare Flat Files and Inventory Feeds

Amazon Seller Central requires UTF-8 CSV for flat file uploads, inventory feeds, and bulk listing edits — not Excel workbooks. When your product data, pricing updates, or inventory counts live in .xlsx files, you need to convert before you can upload. Deliteful converts Excel files to UTF-8 CSV in one step, producing output Amazon's bulk upload tools will actually accept.

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Amazon sellers working with flat files know the format requirements are strict. Inventory Loader, Add Products via Upload, and Price & Quantity feeds all require tab-delimited or comma-delimited UTF-8 CSV. Suppliers and prep centers frequently deliver inventory data as Excel workbooks. When you download your own inventory report from Seller Central and reformat it for a bulk edit, you are working with Excel. Each conversion through Excel's native Save As dialog risks encoding errors that cause Amazon to reject the upload or silently corrupt ASIN data containing special characters.

Deliteful converts each uploaded .xlsx or .xls file to UTF-8 CSV with formulas resolved to values. For Amazon workflows, this means calculated pricing — cost-plus markup formulas, reprice adjustments — export as the actual price values Amazon expects to see, not formula strings. The UTF-8 encoding ensures product titles with trademark symbols, accented brand names, or international characters pass Amazon's validation without substitution errors.

How it works

1
Upload your Excel inventory or product file
Upload the .xlsx or .xls file containing your product listings, pricing data, or inventory counts.
2
First sheet exports as UTF-8 CSV
Deliteful resolves all formula cells to values and exports the first worksheet with UTF-8 encoding applied.
3
Download and upload to Seller Central
Retrieve the CSV and upload it to the appropriate Amazon flat file template or inventory feed in Seller Central.

Frequently asked questions

Why does Amazon require UTF-8 CSV instead of Excel files?: Amazon's bulk upload system is built to process plain text files, not Excel workbooks. UTF-8 CSV is encoding-explicit, which allows Amazon's systems to correctly interpret special characters in product titles, descriptions, and brand names across all marketplaces.
Will pricing formulas in my Excel file export as correct numeric values?: Yes. All formulas are resolved to their computed values before export. A cell containing a markup formula that evaluates to 24.99 will export as 24.99 in the CSV — the value Amazon's price feed expects.
Can I convert Amazon inventory reports I downloaded from Seller Central?: Yes. Reports downloaded from Seller Central as .xlsx files are standard Excel workbooks and convert normally. This is useful for bulk editing — download, modify in Excel, convert to CSV, re-upload.
Does this work for both .xlsx and older .xls files?: Yes. Both formats are supported. Some older repricing tools and third-party software still export .xls files, and these convert with the same behavior as modern .xlsx workbooks.
What if my product catalog is organized across multiple sheets by category?: Only the first worksheet is exported. Consolidate the listings you want to upload onto the first sheet before converting, or process each category sheet as a separate file.

Create your free Deliteful account with Google and convert your Excel product and inventory files to Amazon-ready UTF-8 CSV before your next bulk upload.