Error 99003 — Invalid feed encoding

Amazon couldn't parse your feed because the character encoding is not UTF-8 or contains a BOM that breaks the parser.

Excel and many CSV exporters default to Windows-1252 or include a UTF-8 BOM. Amazon expects clean UTF-8 without BOM.

1. Save the file as 'UTF-8 (without BOM)' in your editor.
2. If using Excel, export via: File → Save As → CSV UTF-8 (Comma-delimited).
3. Use a hex viewer to verify there's no EF BB BF prefix.
4. Resubmit.

• Excel adding BOM to every CSV save — strip explicitly with iconv
• Mixed encodings within a single file — re-encode the whole file