A publishing user identifies a product offered by the user to an online system by providing multiple images of a product viewed at different angles to the online system. The online system applies an identification model to content items obtained from other users to identify the product. From images of the product from the publishing user and content items from other users having at least a threshold confidence of including the product, the online system generates a three-dimensional reconstruction of the product. The online system may subsequently use the three-dimensional reconstruction of the product to display the product to users or to allow other users to identify the product from the online system.