How Paris's Public Image Archives Ended Up Riddled With Duplicate Photos — And What the City Is Doing About It

Paris's city government is moving to formally audit and clean its official photographic archives after years of duplicated images accumulated across dozens of municipal departments, creating a storage and cataloguing crisis that archivists say has been building since at least the early 2010s. The effort, overseen by the Direction des Affaires Culturelles de la Ville de Paris, is the first coordinated attempt to establish a single, deduplicated image repository for the capital's public communications.

The timing matters. With the post-Paris 2024 Olympics legacy period in full swing — the city has committed to repurposing infrastructure from the Stade de France corridor to the Seine-Saint-Denis riverbank — the municipal communications machine has produced an unprecedented volume of photographic material. Event documentation, urban regeneration progress shots, Grand Paris Express construction updates: each stream fed into separate departmental servers, often with no cross-referencing. The result was a digital archive that, by internal estimates circulating among heritage officials this spring, contained significant volumes of near-identical imagery stored under different filenames across incompatible systems.

A Fragmented History

The root of the problem stretches back to the mid-2000s, when individual mairies d'arrondissement and large agencies such as Apur — the Paris Urban Planning Agency — began digitising their own photographic collections independently. There was no common metadata standard. A photograph of the Canal Saint-Martin taken in 2009 might exist in three separate databases: one held by the 10th arrondissement's communications office, one in the central archives on the Rue des Francs-Bourgeois, and another on the server of whichever urban planning contractor handled that year's Seine regeneration documentation.

That fragmentation deepened after 2015, when the Métropole du Grand Paris was established, absorbing functions from 131 surrounding communes and generating its own parallel documentation streams. The Grand Paris Express project alone — now covering 200 kilometres of new metro lines scheduled for phased opening through 2030 — has produced tens of thousands of construction photographs, filed under different naming conventions depending on which of the four SVP project managers logged them. Société du Grand Paris, the public body overseeing the metro expansion, has its own digital asset system that does not automatically sync with the city's central Système d'Information Géographique.

Archivists at the Bibliothèque historique de la Ville de Paris, located on the Rue de Rivoli, flagged the duplication problem formally in a 2023 working paper circulated to the Direction Générale des Systèmes d'Information. The paper noted that a sample audit of imagery from the 2024 Olympic torch relay route — running from the Trocadéro through the 16th arrondissement toward the Périphérique — found duplication rates above 30 percent in certain event folders.

The Deduplication Push

The current remediation plan centres on deploying perceptual hashing software across the city's primary image repositories, beginning with the archives held by Paris Musées — the network of 14 municipal museums — and the communications servers of Paris La Défense, the business district authority across the Seine to the west. Perceptual hashing identifies visually identical or near-identical images regardless of filename or format, flagging them for human review before any deletion is authorised.

Heritage officials have been careful to insist that no image will be permanently deleted without a sign-off protocol, citing the legal obligations under French public archives law — specifically the 1979 loi sur les archives, updated by the Code du patrimoine — which governs the retention of public records. The process is expected to run through the end of 2026, with a consolidated archive portal intended to go live in early 2027.

For Parisians and researchers who rely on the city's image banks — journalists, urban historians, architects working on the Seine rive gauche regeneration zone in the 13th arrondissement — the practical upshot should be a searchable, deduplicated catalogue replacing the current patchwork. Departments have been advised to freeze new additions to legacy systems by September 2026 and migrate to a single upload platform. Whether that deadline holds across all 20 arrondissements, given the competing pressures of housing policy debates and the ongoing Grand Paris Express works, will be the test of whether this particular administrative overhaul actually lands.