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warning 100403

Error 100403 — Title format violation

What this means

Your product title violates Amazon's title formatting rules — common violations include excessive capitalization, special characters, promotional phrases, brand stuffing, or character limit exceedance.

Why this happens

Amazon enforces title rules across categories: maximum 200 characters (most categories), no all-caps, no promotional language ('Best Seller', 'Sale!'), no special characters that aren't standard ASCII, no brand spam.

How to fix it

  1. Trim title to under 200 characters (some categories cap at 80 or 150).
  2. Use Title Case — capitalize first letters of major words only, not entire words.
  3. Remove promotional language: '100% Pure', 'Best Quality', 'Free Shipping', 'Sale', etc.
  4. Format: Brand + Model + Key Specs + Color/Size + Pack — concise and informative.
  5. Resubmit; titles update within 1-4 hours.

Common pitfalls