Product descriptions die two ways: a feature dump that lists specs nobody asked for, or a hero paragraph that buries “what is it” under five sentences of brand voice. Good descriptions answer the buyer’s actual sequence of questions in the order they ask them: what is it, will it fit me, how is it different, what happens if it doesn’t work out. And they survive a 1.5-second mobile glance, where over 60% of marketplace shopping now happens. These 12 prompts force that shape, plus a fit-qualifier (“not great for…”) that builds trust, a returns-objection handler, and a competitor-differentiator rewrite for a description that converts but reads identical to three other brands.
TL;DR
- Lead with the benefit in the first 70–80 characters. On Amazon mobile, that is roughly all a shopper sees of a bullet before it crops.
- Mind the limits (as of June 2026): Amazon bullets cap at 255 characters each (keep under ~200 to dodge mobile truncation), Amazon descriptions cap at 2,000 characters, Etsy descriptions allow tens of thousands of characters (but only the first ~160 show in search), Shopify meta descriptions render best at 120–160 characters.
- The model rarely fails you; thin context does. Paste a real spec sheet, your return window, and one competitor’s copy before asking, not a one-line product name.
- Never ship the same description across size/color variants, and always include a “not great for” line so buyers self-select correctly and you eat fewer returns.
Which model to use (June 2026)
Most paid copy tools run on the same foundation models you can prompt directly, so the lever is context, not the brand on the box. For description work:
- Claude Sonnet 4.6 (Claude writing workflow) holds brand voice across a full catalog and resists superlative drift. Free tier covers light use; Pro is $20/month.
- GPT-5.5 in ChatGPT (ChatGPT writing assistant) is fast for first drafts and bulk variant suffixes; Free $0, Plus $20/month.
- Gemini 3.1 Pro (Google AI Pro, $19.99/month) is handy when you want to paste a product image plus the spec sheet and have one model read both.
Paste the spec sheet, target keywords, and your actual return window into the prompt. Replace each [bracketed placeholder] below with your own details.
Platform limits cheat-sheet (June 2026)
| Field | Limit | Practical target |
|---|---|---|
| Amazon bullet (each) | 255 chars | ≤200 chars; main benefit in first 70–80 |
| Amazon description | 2,000 chars | Front-load “what is it” + fit |
| Etsy description | very high (tens of thousands) | First ~160 chars carry search/meta weight |
| Shopify meta description | up to ~320 chars | 120–160 chars stays visible on mobile |
Best for
- Amazon detail page (above and below the fold)
- Etsy listing description (story-led)
- Shopify product page
- Cross-marketplace consistency
- DTC website hero descriptions
1. 5-bullet feature → benefit
Product: [name + spec sheet]. Write 5 bullet points. Each: emoji or symbol + benefit (what buyer gets) + 1 supporting feature. Keep each bullet under 200 characters with the main benefit in the first 70-80, so it survives Amazon mobile cropping.2. Mobile-first description (first 3 lines)
For [product], write the first 3 lines (what shows on mobile before "Read more"). Must include: what it is, who it is for, key benefit. Hook the reader to expand.3. Q&A-style description
For [product], write a description in Q&A format: 5 questions a buyer would ask in their head, then short answers. Voice: helpful, not salesy.4. “Is this for me?” qualifier
Write a "Best for / Not great for" section for [product]. Best for: 3 scenarios. Not great for: 2 honest scenarios. Builds trust and cuts wrong-fit returns.5. Story-style description
For [handmade / artisanal / heritage product], write a 150-word story description: origin, materials, maker, why this exists. Voice: warm, no marketing-grade superlatives.6. Tech-spec product description
For [tech product], write a description that separates: marketing hook (50 words), spec table (model, dimensions, materials, compatibility), in-the-box.7. Cross-sell + bundle description
Product: [item]. Suggest 3 complementary products buyers should consider. Write 2-line cross-sell copy for each.8. SEO description from scratch
Product: [name]. Primary keyword: [kw]. Secondary keywords: [list]. Write a 250-word description that ranks but reads natural. Use each keyword once or twice in natural phrasing, no stuffing. Mark where each keyword lands.9. Gift-context description
For [product], write a 120-word gift-context version: who would buy this as a gift, for whom, for what occasion. Add 1 line on packaging / unboxing experience. Include the 1 thing the gift-giver wants reassurance on (size, fit, return policy).10. Returns-objection handler
For [product], write a short reassurance block (60-80 words) that addresses the top 2 returns objections (fit unclear, color uncertain, fragile shipping). Be specific: link to the size guide, name the photo lighting, state our exact return window. Honest, not sales-y.11. Competitor-differentiator rewrite
Below is my current description, then my top 3 competitor descriptions for the same product category. Rewrite mine to lead with the 1 attribute that genuinely differentiates, not a generic claim. Mark the sentence that pulls weight the others cannot copy.
[paste mine]
[paste competitors]12. Variant-specific description (size / color / material)
My product has [N] variants. Write a parent description (200 words) plus a 30-word variant-specific suffix for each. The suffix must add a real difference the buyer cares about (fit nuance, use-case, color photography note), not just restate the variant name.Common mistakes
- Feature dump with no translation into buyer benefit
- “What is it” buried in paragraph 3, so mobile readers bounce before they reach it
- Same description across all size / color variants
- No “not great for” line, so buyers self-select wrong and you eat the return
- Brand-voice paragraph above the bullets where bullets should be the first scannable signal
- Keyword stuffing that ranks but reads like robot copy and tanks conversion
FAQ
How long should an Amazon bullet point be? Amazon allows up to 255 characters per bullet, but aim for under 200 so it does not truncate on mobile. Put your main benefit and primary keyword in the first 70–80 characters, since that is roughly what a phone shows before cropping (figures as of June 2026).
Does AI-written product copy hurt SEO? Search engines and Amazon’s A9 rank for relevance and buyer signals, not for who typed the words. The risk is generic, near-duplicate copy. Feed the model a real spec sheet plus your differentiator and one competitor’s text (prompt 11), then edit, and you get original copy that ranks.
Which AI model writes the best product descriptions? There is no single winner. Claude Sonnet 4.6 holds brand voice across a catalog, GPT-5.5 is fastest for bulk variant suffixes, and Gemini 3.1 Pro can read a product photo and spec sheet together. The bigger lever is the context you paste in, not the model.
How do I keep descriptions consistent across Amazon, Etsy, and Shopify? Write one parent description, then ask the model for platform-trimmed versions: a 2,000-character Amazon version, a story-led Etsy version with the hook in the first ~160 characters, and a 160-character Shopify meta. Prompts 1, 5, and 8 cover those shapes.
Should every variant get its own description? Yes for the parts buyers actually compare (fit, use-case, color rendering), no for the rest. Prompt 12 gives you a shared parent plus a short variant suffix so you avoid both duplicate copy and a full rewrite per SKU.
If the packaging is also still TBD, run brainstorming packaging concepts with AI in 10 minutes first; packaging vibe should feed the description’s tone. For field-by-field marketplace caps, Amazon publishes current limits in Seller Central; cross-check against the cheat-sheet above.
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