Duplicate content — getting out of the supplier description trap

Run the test now: copy a whole sentence from one of your product descriptions and paste it into Google inside quotation marks. If you use your supplier's text, you've probably just found ten, fifty, sometimes two hundred stores selling the same product with exactly the same words. Welcome to the most widespread duplicate content problem in e-commerce — and the most ignored.

What duplication actually costs

First, what does not happen: Google doesn't "penalise" your store in the sense of a manual action. External duplicate content raises no red flag. What happens is sneakier:

• Google picks a winner. Faced with two hundred pages of identical content, the algorithm selects one or two to show — usually the oldest, the strongest, or the supplier's own. The rest are filtered out of the results. Not penalised: ignored.
• Your page has no reason to win. If your store is newer or less linked than the competition, your version of the text will never be the one kept.
• You send no differentiating signal. A duplicated page teaches Google nothing about your expertise, your positioning, your audience. It makes you interchangeable — the exact opposite of ranking.

The result reads in Search Console: dozens of pages marked "Crawled, currently not indexed". Google came, recognised the text, and saw no point keeping your copy.

Why everyone stays stuck

If the problem is so well known, why does it persist? Because the merchant's arithmetic is rational in the short term. Rewriting one product description properly takes 15 to 20 minutes. On a 400-item catalog that's over 100 hours of work — two and a half months part-time, or a five-figure copywriting budget. Against that, keeping the supplier text "for now" is understandable. Except "for now" lasts years.

The other blocker is quieter: many imported catalogs don't even have a description to duplicate. Thousands of items with a name, a reference, a price — and an empty description field. That isn't duplication any more, it's a void, and Google doesn't index a void.

The way out, by priority

Don't try to rewrite everything at once. Prioritise by impact.

1. Your twenty best sellers (week 1)

They're the ones getting traffic and making revenue. A full rewrite — structured description, worked title tag and meta description, target keyword — pays back in weeks.

2. Products on winnable queries (weeks 2-4)

The precise references where competition is weak: the catalog's long tail. A unique, well-tagged page can reach the first page quickly, precisely because all your competitors kept the supplier text.

3. The rest of the catalog (ongoing)

The back catalog gets handled as you go, in batches. This is where AI changes the equation: what was blocking — the cost of those 100 hours — disappears.

Rewriting at scale without producing another duplicate

Watch for the circular trap: if you ask a generic AI to "rewrite this description", you get a paraphrase of the supplier's text — content that is technically unique but informationally identical, reproducing the problem in a subtler form.

To produce genuinely differentiated pages you have to inject data the supplier never sent:

• your structured specifications (compatibility, dimensions, materials) reworded as benefits;
• your commercial angle: who this product suits, and who it doesn't;
• the photo, when the text is missing: vision models describe material, shape and finish from the cover image — that's the answer to empty pages, and what Publium's description generator uses on silent catalogs;
• one target keyword per page, steering the text towards the query you want to win.

And keep the human review: ten pages reviewed and published a day means a 400-item catalog differentiated in two months, without hiring.

The edge cases that always come up

Variants (sizes, colours). Don't rewrite the same page fifty times: PrestaShop handles combinations on a single page, and that's the right model. Internal duplication between combinations is solved by structure, not by copywriting.

Marketplaces. Selling on Amazon with the same text as your store recreates the problem — and Amazon will win the arbitration. If you're on both, differentiate at least the pages of your strategic products.

The supplier who insists on their text. Rare, but it happens (approved claims, regulatory wording). Keep the mandatory block, and add your content around it: introduction, usage advice, product FAQ. The mix is enough to differentiate the page.

Where to start today

Redo the quotation-mark test on your ten flagship products. Count the copies. Then rewrite exactly one — the best seller — following the method for descriptions that sell, and compare its behaviour in Search Console at thirty days. It's the most convincing experiment there is: you'll watch one page go from "not indexed" to ranking while its duplicated siblings stay invisible. Frequent questions on the subject have their answers in our FAQ.