must I display warning pictograms on my product page

Warnings must also appear on the product page, not only on the label

Yes: warning pictograms and the accompanying warning text must in most cases also appear on the product page, not only on the label or packaging. The background to this is that a consumer purchasing online does not have the product in hand at the moment of ordering — they only see the screen. For this reason, the regulation requires that safety information must be visible before purchase, not only upon arrival of the package.

Which pictograms and texts are precisely necessary varies by product and by risk — this is not a fixed list that is the same for every article. What does apply to every product with a warning: that warning must appear in the consumer's language on the page, so when selling in the Netherlands in Dutch. If you also sell to German or Belgian customers, in practice you will need multiple language versions of the same pictograms and text. More on this language requirement can be found at Can I use English warnings in a Dutch webshop?, and a complete overview of what else must appear on the page at What information must be on my product page under the GPSR?.

This follows from Article 19, and the role determines who handles it

This obligation is set out in Article 19 of Regulation (EU) 2023/988, which specifically concerns the information that must be visible before conclusion of the contract in distance sales — including an online shop. Who places that information on the page depends on the role in the supply chain: manufacturers have this obligation under Article 9, importers under Article 11. A distributor who merely resells without placing their own brand on it typically does not themselves have this specific information obligation of Article 19 — rather, they verify whether the information is already there, instead of drawing it up themselves. This distinction is less obvious than it might seem: if you sell a purchased product under your own name or logo, you are considered a manufacturer and do bear the full information obligation of Article 19 and Article 9. What your own role is in a specific case is set out in detail at Am I a manufacturer, importer or distributor under the GPSR? and at Am I a manufacturer if I put my own brand on a purchased product?.