Understanding Error 99012: Invalid Characters in Seller Central Listings
Error 99012 occurs when Amazon’s validation engine finds characters outside the allowed whitelist in titles, bullet points or other fields. It appears in flat‑file import reports, SP‑API responses, or inline warnings in Seller Central. Stripping emojis (e.g., ☕), smart quotes (“ ”) and em‑dashes (—) resolves the rejection.
Overview
Sellers encounter error 99012 when Amazon’s validation engine detects characters in a listing field that fall outside the permitted set. The issue appears during product creation or updates, whether through flat‑file uploads, API calls, or the Seller Central web interface. Resolving it quickly prevents delays in getting new ASINs live and keeps bulk‑upload workflows running smoothly.
Key Points
- Error trigger — The system flags any field that contains characters it deems invalid, inserting the offending value into the error message in place of the placeholder.
- Typical offenders — Emojis, smart quotes, en‑dashes, hidden Unicode symbols, HTML tags, and some accented letters frequently cause the rejection.
- Where it shows up — You can see 99012 in flat‑file import reports, SP‑API responses, or as an inline warning while editing a product directly in Seller Central.
- Immediate fix — Identify the highlighted value, strip out non‑standard characters, and resend the submission.
- Prevention tip — Use plain‑text editors or paste‑through‑a‑text‑only step before entering data into Amazon’s tools.
How Error 99012 Works
- Data submission — When a seller uploads a spreadsheet, sends an API payload, or saves a listing edit, Amazon receives the raw text for each attribute. Example: a title field receives “Cozy Café Mug – 12 oz ☕”.
- Character‑level validation — Amazon compares every character against a whitelist defined for that attribute. Numeric fields allow only digits and punctuation; title fields permit letters, numbers, and a limited set of symbols. Example: the coffee‑cup emoji (☕) is not on the title whitelist, so the check fails.
- Error generation — If any character falls outside the allowed range, the platform rejects the entire row or request and returns error 99012, embedding the exact offending string in the response. Example: the system returns “Error 99012 – Invalid characters: ☕”.
- — The offending row or API call is not processed further, meaning the product remains unpublished or unchanged until the seller corrects the data.
Analysis & Recommendations
Why This Matters
Each 99012 rejection forces manual correction, delaying ASIN activation and potentially missing high‑traffic windows. Bulk uploads can halt entirely, adding hours of work to locate and replace offending characters such as emojis, curly quotes, or hidden Unicode symbols.
Key Takeaways
- Error 99012 flags any field containing characters not on Amazon’s whitelist, e.g., the coffee‑cup emoji (☕) in a title.
- Flat‑file uploads, SP‑API payloads, and the Seller Central web editor all surface the same 99012 message with the offending string embedded.
- Using a plain‑text editor like Notepad or disabling smart‑quote auto‑formatting in Excel prevents invalid characters from entering the upload.
Recommended Actions
- →In Seller Central, go to Inventory > Add Products via Upload, download the template, open the CSV in Notepad, replace smart quotes (“ ”) and em‑das...
- →If using SP‑API, add a preprocessing step in your middleware to force UTF‑8 encoding and strip characters outside the ASCII range before sending th...
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