You know that moment? Cursor blinking in the description field, fingers hovering over the keyboard, brain stuck in a loop: Write more? They might need details. Write less? They‘ll just scroll past.
I’ve been there. For my first three months selling, this question ate up way too much mental bandwidth. Eventually, I got tired of “going with my gut” and decided to actually figure it out. I dug through every piece of industry data I could find and ran my own A/B tests across a few ASINs.
What I found was honestly pretty revealing: length matters, but not in the “more is better” or “shorter wins” way people talk about. Here‘s the real deal—so you can stop guessing and start writing.
First, a Counterintuitive Fact: Longer ≠ Better
An independent site seller once decided their yoga apparel page was too short—only 198 words. So they beefed it up to 815 words, thinking more content meant more trust.
Result? Bounce rate shot from 68% to 89%. Conversion rate went to zero.[reference:17]
Surprising, right? Most of us assume “more info = more credibility.” But here’s the thing: every sentence you add is a tax on the reader‘s attention. If that sentence doesn’t deliver value, they‘re gone.
But writing too short is just as bad. Research shows that among pages with under 300 words, 73% lose significant traffic due to keyword density below 0.8%. Users spend an average of only 40 seconds on those pages, versus the industry benchmark of 2 minutes and 10 seconds.[reference:18]
The takeaway: Length isn’t the goal. Precision is. You don‘t need “how long.” You need “how long for each section.”
Titles: The First 80 Characters Decide Everything
Since January 21, 2025, Amazon enforces a 200-character maximum for titles in most categories. Apparel is even stricter at 125 characters.[reference:19]
But here’s the real killer: mobile search results truncate after about 70-80 characters.[reference:20] So even if you use all 200, mobile shoppers only see the first chunk.
Golden rule for titles: Core keyword and primary benefit must land within the first 80 characters. Use the remaining space for long-tail terms and attributes.
Also, 2026 has a new trap: you can‘t repeat the same word more than twice in a title (prepositions and articles excluded). Amazon’s crawler will flag it and auto-correct it if you don‘t.[reference:21] So stop writing “bag carrying bag.”
Bullet Points: ~200 Characters Each, Under 1,000 Total
Bullet points are the first thing shoppers actually read after the title. In 2026, the limit is still five bullets, but Amazon recommends keeping all five combined under 1,000 characters—roughly 200 per bullet—so nothing gets cut off on mobile.[reference:22]
The first two bullets carry the most weight, both for algorithms and for human eyeballs.[reference:23] Put your strongest benefits and secondary keywords there.
Also, don’t just copy your bullets into the description. Bullets are the verdict (“why buy”). The description is the evidence (“why believe”).
Product Description Body: 300-500 Words Is the Sweet Spot
This is where the debate gets heated. Amazon‘s official limit is 2,000 characters (including HTML tags), but almost no one actually writes that much.[reference:24] Amazon’s own Seller Central forum suggests something more practical: 150 to 2,000 characters, roughly 3 to 5 sentences.[reference:25]
Industry best practices for ecommerce copy generally recommend 300-400 English words (about 1,800-2,400 characters). This length balances SEO coverage with mobile readability.[reference:26] Beyond that, every extra 50 words on mobile increases the chance a shopper bounces.
More important than exact word count: your description should complement the bullets, not repeat them[reference:27]. Bullets say what the product does. The description says how it does it.
Different Products Need Different Lengths
Sortlist analyzed 11,000 best-selling products and found a clear pattern:[reference:28]
| Product Type | Recommended Length | Why |
|---|---|---|
| Low-cost commodities (e.g., phone cases) | 100-200 words | Decisions are fast; price and images do the work |
| Mid-range functional items (e.g., yoga mats) | 300-400 words | Need to explain features, but keep it tight |
| High-ticket items (e.g., espresso machines) | 300-400+ words | Higher decision cost demands more reassurance |
The logic is simple: the higher the price, the more “reasons to buy” shoppers need. You buy a phone case in seconds. You research a coffee machine for days. Match your description length to the decision complexity.[reference:29]
If you‘re optimizing Amazon product descriptions , you can also use Amazon’s Manage Your Experiments tool to A/B test different lengths and let real data decide.[reference:30]
FAQ
Q: Should I prioritize the standard description or A+ Content?
A: Both. And don‘t just copy-paste one into the other. Here’s the critical detail most sellers miss: A+ Content is NOT indexed by Amazon‘s search algorithm. Only the text in the standard description field contributes to keyword rankings.[reference:31] So write a solid standard description first for SEO, then use A+ Content for visual conversion. They work together, not as substitutes.
Q: Mobile shoppers barely scroll to the description. Why bother writing it long?
A: Fair point. Most shoppers don‘t scroll. But two things are happening that you can’t see. First, Amazon‘s A10 algorithm still indexes every word in your description for search ranking. Second—and this is bigger—Rufus, Amazon’s AI shopping assistant, now pulls information from your description to answer shopper questions. Over 250 million users have used Rufus, and shoppers who engage with it are over 60% more likely to purchase.[reference:32] Your description may not be “read” by humans, but it‘s absolutely being “read” by AI.
Q: How do I actually decide the right length for my product?
A: Three steps. One, check your price point: under $50 lean shorter (200-300 words), over $50 go longer (400-500 words). Two, audit competitors: search your main keyword, take the top 10 listings, average their description length—that’s what shoppers in your category expect. Three, preview on mobile: if the description takes more than one full screen to get to the point, cut it. If you don‘t want to spend hours figuring this out, use an AI copywriting tool that generates drafts tailored to your category and length requirements. No more trial and error.
Q: How does the 2026 A10 algorithm change the game for description length?
A: The big shift in 2026 is that A10 no longer just looks for keywords—it looks for intent. The COSMO framework gives Amazon reasoning ability: it understands who the product is for, what scenario it’s used in, and what specific problem it solves.[reference:33] Your description isn‘t written for a search engine anymore. It’s written for an AI that‘s trying to understand human needs. Answer precisely, and you rank. Length doesn’t matter as much as relevance does.
The Bottom Line
Three numbers to remember:
| Section | Recommended Length | One-Liner Reason |
|---|---|---|
| Title | Core keyword in first 80 chars, total ≤200 | That‘s all mobile shows |
| Bullet Points | 5 bullets, ≤1,000 characters total | Avoid mobile truncation |
| Product Description | 300-500 words (shorter for low-cost) | Match length to decision complexity |
Next time you’re stuck on “how long,” stop guessing. Pick a range based on your category, publish, check the data in two weeks, and tweak. Numbers beat intuition every time.
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📝 Originally published on AI Trade Pal Blog
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