Amazon Listing Error 99040: Missing Main Image URL and How to Fix It
Error 99040 occurs when the required main_image_url field is empty, malformed, or inaccessible, causing Amazon to reject the feed and hide the product. In a recent bulk upload, 250 SKUs were blocked until compliant URLs (e.g., https://images.example.com/56789_main.jpg) were added, restoring visibility within hours.
Overview
Error 99040 appears when Amazon rejects a product feed because the required main_image_url field is empty or invalid. The issue stops the listing from becoming active, meaning customers cannot see the product until a proper primary image URL is supplied. Sellers must address the error promptly to keep listings searchable and avoid lost sales.
Key Points
- Missing main_image_url triggers the error — Submissions that omit the primary image field in flat files, API feeds, or the “Add a Product” wizard generate error 99040.
- Primary image is mandatory for visibility — Amazon will not display a product in search results or on its detail page without a main image that meets the platform’s standards.
- Fix requires a valid URL — Adding a publicly reachable link to a compliant image in the main_image_url column and re‑uploading the file resolves the issue.
- Image quality affects discoverability — Listings lacking a main image are effectively invisible, causing potential revenue loss especially during launches or promotions.
- Bulk updates increase risk — Large catalog uploads often unintentionally clear the image column, making many ASINs fail validation simultaneously.
- Hosting reliability matters — Even when a URL is present, a broken link or restricted access will still raise error 99040.
How Error 99040 Occurs
- Empty image column in bulk file — During a spreadsheet upload, a seller deletes the content of the main_image_url cell for SKU 12345, resulting in the error when the file is processed.
- Third‑party tool mapping failure — An inventory management software fails to map the image field, sending a feed where the URL for ASIN B07XYZ is omitted, which triggers the validation check.
- Removed or expired image URL — A seller replaces the host of their images, causing the previous URL for product ABC‑001 to return a 404 error; Amazon flags the listing with error 99040.
- Invalid URL format — A feed includes a URL containing spaces (“http://example.com/image 1.jpg”), which Amazon cannot parse, leading to the same error.
Analysis & Recommendations
Why This Matters
Without a valid main image, listings disappear from search results, leading to revenue loss—e.g., a smartwatch launch could lose days of sales. The error can affect hundreds of SKUs at once, as seen with 250 products blocked, and may also waste ad spend on invisible items.
Key Takeaways
- Error 99040 is triggered by an empty, broken, or non‑public main_image_url field.
- A bulk upload that left main_image_url blank for 250 SKUs caused those listings to vanish from search.
- Amazon requires a white background, 85% frame coverage, and a minimum side length of 1,000 px for the main image.
- Valid URL formats include JPEG, PNG, GIF, and TIFF; URLs with spaces or restricted access are rejected.
Recommended Actions
- →In Seller Central, go to Inventory → Upload Reports, locate rows with error 99040 and add a compliant URL (e.g., https://images.example.com/SKU_mai...
- →Verify each URL loads publicly by opening it in a browser; replace any 4xx or forbidden links.
- →Re‑upload the corrected spreadsheet and monitor the Upload Reports until error 99040 is cleared.
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