How to Optimize Product Descriptions for Google Shopping

The product title is the strongest signal in your Shopping feed, but it’s short. The product description is where you describe the product with all the context a short title can’t hold.

In this post, I’ll show you what belongs in a good description, how to use product highlights, and which detail fields many shops forget.

What does the product description do for Google Shopping?

The product description is the description attribute in your product feed. It’s a longer free-text field where you describe the product in detail, with attributes, technical specs, and benefits.

Unlike the title, the shopper only sees the description after clicking through to the product details. It doesn’t sit prominently in the ad. Here too you write mainly for the machine, but you have far more room to provide the full context.

And the context is what this is about. The more Google and AI-driven systems decide which product they match to a search or a question, the more it matters how completely you describe your product in the feed. The title carries the most weight, the description provides the depth behind it.

Two of Google’s rules are worth knowing. The description can be up to 5,000 characters long. And the most important information belongs in the first 160 to 500 characters, because the shopper has to expand the rest. (Source: Google Merchant Center, description attribute.)

What belongs in a good product description?

Google recommends including the product’s attributes, technical specs, and visible features: size, material, suitable age group, special functions, design, and variants. Describe the product itself, not your shop.

Beyond these required blocks, it pays to describe the benefits and the intended use. What is the product good for, what problem does it solve, in what situation is it used. The description is the place for everything the short title has no room for.

Think about what your shoppers search for, but don’t make it more complicated than it needs to be. As long as you can say a lot that’s true about the product, it can go in.

Order matters. The first 160 to 500 characters are the part the shopper sees without a click and that the systems read first. The core belongs there: what the product is, the key benefit, and the central attributes. The detailed specifics follow after.

As a rule of thumb: use the first 500 characters for sure if you have the room. If you have more relevant things to say, keep writing, as long as every sentence says something real about the product. Padding with fluff does nothing, but for a product you can say a lot about, a description that’s too short is wasted context.

You want more results with Google Ads?

Get a free Google Ads Reality Check: a compact video (about 10 minutes) showing where budget is slipping away in your account and what to change.

Get your Google Ads Reality Check →

How do you build a description step by step?

When you write a description from scratch, this order helps:

1. Core first: In the first sentence or two, what the product is and its main benefit.
2. Central attributes: The key technical specs and features that drive the buying decision.
3. Intended use and benefits: What the product is good for and what problem it solves.
4. Details and variants: Material, dimensions, care notes, variants, and everything else in the back.
5. Check it against the rules: No prices, no shipping, no links, no competitor comparisons, normal capitalization.

Write in full, readable sentences. A description is allowed to be thorough, as long as every sentence carries real information about the product.

How do you use product highlights right?

Alongside the free-text description, there’s a dedicated attribute for the key benefits: product_highlight. These are short bullet points that capture a product’s most important features.

Google gives clear specs for them: up to 150 characters per highlight, 4 to 6 recommended, a minimum of 2 and a maximum of 100. The focus is on selling benefits that answer typical shopper questions, not pure technical specs. Don’t just repeat the title or description, bring your own complementary points. (Source: Google Merchant Center, product_highlight attribute.)

These highlights are worth a closer look for one reason: per Google, they’re served across AI-driven surfaces, like AI Mode in Google Search, and they also improve the classic search experience. Maintaining clean highlights now gives these new search surfaces the context they build their answers from.

Which detail fields get forgotten most often?

The description is free text, but a large part of the context sits in the structured detail fields next to it. Google uses these fields to filter products and match them to relevant searches, and many shops leave them empty.

The most commonly forgotten fields are the product attributes: material, color, size, age_group, gender, and pattern. On top of that come category-specific attributes, like the energy label for electrical appliances. Every filled field is an extra signal that can surface your product in a filtered search.

My advice here is the same as for the title: fill out everything in the feed that you can fill cleanly. An empty field is wasted context, and context is the currency you pay the systems with in e-commerce.

Both product highlights and the individual detail fields have more depth that deserves its own post. For a strong product description, the principle is enough: as much relevant context as possible, in the free text and in the fields.

This field work pays off in the campaign. With a feed-only PMax campaign, the feed carries practically the whole campaign, and the same feed also powers dynamic remarketing. Where the feed data gets served and when standard Shopping is worth it, you’ll find in the comparison PMax vs. standard Shopping.

Which mistakes cost you visibility?

As with the title: the biggest mistake is not taking the description seriously. When it’s just a thin sentence or copied manufacturer text, you give away all the depth context. The concrete mistakes below usually come on top.

Advertising in the description. Prices, discounts, shipping, or delivery info don’t belong in the text, per Google, that’s what dedicated fields are for. Promotional claims can get the product disapproved.

Links in the text. References to your shop or other sites aren’t allowed in the description.

Comparisons to competitors. Phrases like “better than brand X” aren’t permitted, per Google. Describe your product on its own terms.

Capitalization and symbols for emphasis. All-caps words or special characters meant to force attention violate the rules. Write normally.

Highlights that just repeat the title. When your product highlights come word for word from the title, they add no extra context. Use them for benefits that aren’t anywhere else in the feed.

The important part too late. When the core of your description only comes after 500 characters, shoppers and systems see nothing but side details on first contact. Put the decisive part up front.

FAQ: Common questions about product descriptions

Conclusion

The product description is the depth layer of your feed. The title decides whether your product fits the search at all, the description provides the full context behind it, with attributes, benefits, and the intended use. On top come the product highlights, one of the few fields that feed directly into AI surfaces, and the structured detail fields that many shops leave empty.

The next step is concrete: take your best-selling products and check whether the description is more than a copied manufacturer sentence, whether the first 500 characters carry the most important parts, and whether the detail fields are filled. It’s grunt work, but it gives the systems the context they use to match your product to the right search.

Thanks for reading this far. Good luck putting it into practice!

Work smart with Clicks in Mind