A product description converts when it answers what the images could not. Shoppers scan rather than read, so structure it as highlights, not prose. Then write it twice more. The Google Shopping feed bans the urgency, social proof and brand voice that work on the page, and marketplaces cap each bullet at roughly 200 characters. One product, three versions.
Most advice on this topic assumes you are writing one description. You are not. The paragraph on your product page, the description in your Google Merchant Center feed, and the five bullets on your Amazon listing are three separate assets with three separate rulebooks, and following the standard advice on all three gets two of them rejected.
That is the expensive part. A brand writes one lovely description full of urgency and brand personality, pushes it everywhere, and then wonders why Merchant Center throws warnings and the Amazon listing gets auto-edited.
This covers what each surface accepts, how to write the on-page version so people actually read it, and how to stop writing the same sentence three times.
Key Takeaways
- Shoppers scan, they do not read. Nielsen Norman Group’s page-reading research found 79% of test users scanned any new page rather than reading word by word (nngroup.com). Write for the scan.
- Highlights beat paragraphs. Baymard Institute found descriptions structured by feature highlights cause deeper exploration, yet only 22% of benchmarked sites do it (baymard.com, August 2026).
- Google bans most copywriting advice. The Merchant Center description attribute disallows price, sale dates, shipping, your company name, links, all-caps emphasis and comparisons to other products (support.google.com, August 2026).
- Front-load the feed. Google caps the description at 5,000 characters but asks for the important details in the first 160 to 500 (support.google.com, August 2026).
- Marketplaces cap you hard. Amazon shows five bullets on a standard listing, with per-bullet limits commonly between 200 and 255 characters and lower in some categories.
- The description answers what the gallery could not. Fix the image set first and the description gets shorter and works harder.
What makes a product description convert
A description converts when it removes the specific doubt stopping the purchase. That doubt is almost never “what is this product”. It is size, fit, material, compatibility, what is in the box, or what happens if it is wrong. Shoppers arrive at the description after the images, carrying one unanswered question. The description that converts answers that question in the first two lines.
Baymard Institute’s benchmarking found that 10% of ecommerce sites carry product descriptions insufficient for users’ needs, and that users routinely describe prose descriptions as bland or boring, which cuts the time they spend on products they were otherwise suited to (baymard.com, August 2026).
So the job is narrow. Not “describe the product”. Answer the objection the pictures left open.
Why shoppers never read the description you wrote
They scan it. Nielsen Norman Group’s research on how people read web pages found that 79% of test users always scanned a new page and only 16% read word by word, with users consuming roughly 20 to 28% of the words on an average page (nngroup.com).
Apply that to a 180-word product description and the reader takes in about 40 words, chosen by where their eye lands. If your differentiator sits in the middle of the third sentence of a paragraph, it was never read.
This is why the feature-versus-benefit debate matters less than people think. A benefit buried in prose and a feature buried in prose both go unread. Position beats phrasing.
Structure the page description as highlights, not paragraphs
Break the description into labelled highlights instead of a block of text. Baymard’s testing found users given highlight-structured descriptions performed more in-depth exploration than users given conventional text blocks, and that only 22% of benchmarked sites structure descriptions this way even on their top-selling products (baymard.com, August 2026).
A highlight is a short bolded label plus one line. Not a bullet list of adjectives.
| Weak | Highlight-structured |
|---|---|
| ”Crafted from premium stoneware with a durable glaze, this mug is perfect for your morning routine.” | Material: Stoneware, 320ml, 0.4kg |
| ”Available in a range of beautiful colours to suit any kitchen.” | Finish: Reactive glaze, so no two are identical |
| ”Dishwasher safe for your convenience.” | Care: Dishwasher and microwave safe |
The right column is shorter, less charming, and answers more questions per second of attention. That is the trade the scan forces on you.
Keep the page description between roughly 60 and 200 words of actual highlight content. Longer is fine below the fold for the minority who expand it, but everything load-bearing goes above.
Write the description against your images, not a blank page
Open your gallery before you open the text field. Every question the images already answer is a sentence you do not need to write, and every question they leave open is a line the description owes the shopper.
A gallery that shows scale, texture, the product in use and one frame per variant retires most of the description’s workload. A gallery of five near-identical front-on shots pushes all of it back onto the text, where 79% of readers will skim past it. We covered the sequence that works in what to show in a PDP gallery and in what order.
For most catalogues that is the higher-return fix. Adding a scale shot and a detail crop does more for conversion than another rewrite of the same paragraph, because it moves the answer from a surface people scan to a surface people look at. DesignerBox’s Photo Studio builds that full set from one photo of the real product, and Photo Angles covers the multi-view part specifically. For a whole catalogue, the bulk catalog processor workflow runs the same set across every SKU.
Before you commit a generated image to a listing, run the accuracy checks in our guide on what to verify in an AI product photo. A description that contradicts the picture costs more than a weak one.
The Google Shopping feed bans most product description advice
The description you submit to Google Merchant Center follows different rules to the one on your page, and the standard copywriting checklist violates several of them.
Google’s product data specification disallows promotional text in the description attribute, naming price, sale price, sale dates, shipping, delivery date, other time-related information and your company’s name. It also disallows links to your store, capital letters used for emphasis, and comparisons or details about other products. Descriptions must cover the product itself, not accessories, business history or store policies (support.google.com, August 2026).
Read that against the usual advice. “Create urgency” is time-related information. “Use social proof” tends to arrive as review counts and superlatives. “Show your brand personality” is where the company name and the all-caps emphasis creep in. “Add a call to action” is a link or a store reference. Four common tips, four ways to trip the spec.
The length rules also differ from the page. Google accepts up to 5,000 characters but asks you to put the most important details in the first 160 to 500 characters, because shoppers see only the opening before expanding (support.google.com, August 2026).
What the feed version looks like: plain, factual, front-loaded, no brand voice. Size, material, fit, contents, compatibility, in that order. It reads like a spec sheet because that is what it is.
Marketplace listings run on hard character caps
Amazon is a third rulebook again. A standard listing shows five bullet points, and seller documentation puts the per-bullet cap commonly between 200 and 255 characters, with some categories including apparel set lower. The long description field runs to around 2,000 characters. Bullets take no HTML and no all-caps emphasis, and Amazon may auto-edit or remove content that breaks the guidelines. Check Seller Central for your specific category before writing to a number, because the caps vary and move.
The practical effect of a 200-character bullet is that you get one claim per bullet, stated plainly. There is no room for a setup sentence. Lead each bullet with the attribute, then the detail.
Marketplaces also have their own rules on AI-generated imagery and on what a listing photo may show, which is a separate compliance question from the copy. Our breakdown of what each marketplace requires for AI product images covers Amazon, Etsy, Walmart, eBay and TikTok Shop.
What AI shopping surfaces read
AI shopping assistants and Google’s shopping surfaces do not parse your on-page prose the way a shopper does. They read the structured product data: the feed attributes, the schema markup, the price, availability and return policy. A well-written paragraph on the page contributes little if the feed behind it is thin or non-compliant.
That reinforces the same conclusion from a different direction. The feed version of the description is not a downgraded copy of the page version. It is the version that machines read, and it is increasingly the one that decides whether your product appears at all.
Keep both accurate and keep them consistent on the facts. A size stated one way on the page and another way in the feed is the kind of mismatch that produces returns.
One product, three versions: the working checklist
Write the facts once, then cut three versions from them.
- Build the fact block. Dimensions, weight, material, fit, contents, compatibility, care, country of origin. Plain values, no sentences. This is the source for all three versions.
- Audit the gallery. Mark every fact the images already answer. Those drop down the priority list for the page version.
- Write the page version. Bolded highlight labels plus one line each. Lead with the fact that answers the most common objection. Keep the load-bearing content above the fold.
- Write the feed version. Strip brand voice, urgency, company name, links, all-caps and comparisons. Front-load the first 160 to 500 characters with size, material and fit.
- Write the marketplace version. Five bullets, one claim each, attribute first, inside your category’s character cap.
- Check them against each other. Same numbers, same names, same variant labels in all three.
Steps 1 and 2 take the time. Steps 3 to 5 are twenty minutes once the fact block exists, which is the whole argument for building it first.
If you want to know whether the changes worked, run the traffic math before you run the test. Most stores cannot detect a real lift at their session volume, which we cover in ecommerce image testing.
FAQ
How long should a product description be?
There is no single answer because there are three descriptions. On the page, aim for 60 to 200 words of highlight-structured content, with the load-bearing facts above the fold. In the Google Merchant Center feed, the cap is 5,000 characters but Google asks for the important details in the first 160 to 500 (support.google.com, August 2026). On Amazon, five bullets at roughly 200 to 255 characters each, depending on category.
Should product descriptions focus on features or benefits?
Both matter less than position. Nielsen Norman Group found 79% of users scan rather than read (nngroup.com), so a benefit buried in a paragraph is as invisible as a feature buried in a paragraph. Put the fact that resolves the shopper’s main doubt in the first highlight, then decide how to phrase it.
Can I use the same product description on my site and in Google Shopping?
Only if the page version already follows Google’s rules, which most do not. The Merchant Center description attribute disallows price, sale dates, shipping information, your company name, links, all-caps emphasis and comparisons to other products (support.google.com, August 2026). Urgency, social proof and CTAs typically fall foul of at least one of those.
Do I need a different product description for Amazon?
Yes. Amazon’s format is five bullets with hard per-bullet character caps and no HTML, so a paragraph written for your own site does not fit the field. Write one claim per bullet with the attribute first, and check Seller Central for your category’s specific limit.
Does the product description need to repeat what the images show?
No, and repeating them wastes the attention you have. Audit the gallery first, then write the description to cover what the images left open. If the gallery answers scale, texture and use, the description gets shorter and converts harder.
Does AI-written listing copy hurt SEO?
Search engines judge the description on whether it answers the query and matches the product, not on how it was produced. Thin, duplicated or inaccurate copy is the risk, whoever wrote it. Accuracy against the actual product is the thing to check.
How many bullet points should a product listing have?
On your own site, three to six highlights covers most products without pushing the important ones below the fold. On Amazon, five is the standard slot count. Adding more highlights past that point tends to dilute the first ones rather than add information.
Fix the images and the description gets easier
Every question your gallery answers is a line the description does not have to carry, and images get read where text gets skimmed. Build the full set from one photo of the real product, then write the three versions against what is left.
Try the free AI product photo generator, or see what the plans cost.
Product description requirements verified from Google Merchant Center product data specification, Amazon seller documentation, Baymard Institute and Nielsen Norman Group as of August 2026. Amazon character caps vary by category and change; confirm in Seller Central before writing to a number. Individual results vary.
