Marketplace Description Generator
A marketplace description generator is a tool that assembles a compliant product description formatted to a specific marketplace's field structure and character limits. This one builds descriptions for Amazon, eBay, Etsy, Shopify, Walmart and TikTok Shop, with SEO, AEO and GEO layers. It is rule-based assembly, not AI writing — it arranges the facts you supply and never invents details.
Product details
Tone changes sentence templates and adjectives only, never facts.
Images local only
Files never leave your browser. The tool reads pixel size, aspect ratio and file size, then checks them against the selected marketplace's rules. It cannot see what is in the photo, so it will not describe the image.
Output also regenerates live as you type.
Rules for Amazon
Verified against official seller documentation, mid-2026. Values marked verify vary by category or seller type — confirm in Seller Center before publishing.
| Description limit | 2,000 chars |
| Description HTML | none — plain text + line breaks (HTML deprecated 2021) |
| Bullets (Key Product Features) | 5 bullets |
| Per bullet | ~255 chars (up to 500 Brand Registry) verify |
| Backend search terms | under 250 bytes (not chars) |
| Prohibited | medical claims, superlatives, guarantees, price/promo, contact info, URLs, competitor brands |
| Main image | 1000px+ longest side (zoom), pure white background, 85% fill |
| Mobile truncation | title ~70–80 chars visible |
Output — Amazon
Similarity —Description limits & image requirements across marketplaces
Verified against official seller documentation, mid-2026. Category-specific style guides can override the general figures below.
| Marketplace | Description limit | Bullets / tags | HTML allowed | Main image |
|---|---|---|---|---|
| Amazon | 2,000 chars | 5 bullets, ~255 ch each | None (plain + line breaks) | 1000px+ longest, white bg |
| eBay | 500,000 chars | free-form; item specifics | Static HTML/CSS (no active content) | 500px+ (1600px zoom) |
| Etsy | ~10,000 chars (160 in search) | 13 tags, 20 ch each | Plain text | 2000px shortest recommended |
| Shopify | No strict cap (rich HTML) | free-form | Full rich text | 2048×2048 square |
| Walmart | 4,000 chars | up to 10 key features | Limited / plain | 1000×1000 min, white bg |
| TikTok Shop | 10,000 chars | free-form bullets | p, ul, li, br, b, i, em, u | 600×600 min, 1:1, 5+ images |
Backend search terms on Amazon are measured in bytes (under 250), not characters — the single most common tooling mistake. Emoji and accented characters cost multiple bytes each.
Why use this marketplace description generator
Most free product description generators write one block of AI copy and send your data to a server. This one is built for multi-channel sellers who care about compliance, search ranking and privacy.
Enter your product facts once and get field-correct listings for Amazon, eBay, Etsy, Shopify, Walmart and TikTok Shop, each formatted to that platform's structure and character limits.
Product details and images never leave your device. No upload, no API call, no account, no tracking — everything runs client-side.
A live similarity score across all six listings, so copied text does not trigger duplicate-content penalties on Google or Walmart.
Keyword placement for search, a self-contained Q&A block for answer engines, and Product JSON-LD so AI assistants can cite your listing.
Backend search terms are counted in bytes under 250 — the limit most description tools miss because they count characters instead.
Flags medical claims, superlatives, guarantees, price wording, contact details and competitor names, with a suggested rewrite for each.