Barcelona's Digital Archives Push to Fix Thousands of Duplicate Images This Week

Barcelona's network of public digital archives crossed a significant internal threshold this week, with municipal technicians at the Arxiu Municipal de Barcelona confirming they are mid-way through a project to identify and remove tens of thousands of duplicate image files that have accumulated across the city's fragmented content management systems since at least 2019. The cleanup is part of a broader digital governance initiative tied to the city's Pla de Transformació Digital, the multi-year roadmap being administered through the Ajuntament's own technology directorate on Carrer Tànger in the 22@ district.

The timing matters. Barcelona has been digitising at an accelerating pace since the post-pandemic push to put municipal services online, and that speed created a secondary problem: the same image — a heritage photograph, a public infrastructure shot, a promotional graphic — often exists in three, four or even five separate repository folders, tagged inconsistently and sometimes licensed differently. For institutions that share assets with regional partners or with the Generalitat de Catalunya's own digital platforms, those inconsistencies create legal and logistical headaches that go well beyond cosmetic tidying.

What happened this week

On Tuesday, the Consorci de Serveis Universitaris de Catalunya (CSUC), which manages shared digital infrastructure for Catalan universities including the Universitat de Barcelona and the Universitat Pompeu Fabra, circulated a technical notice to member institutions flagging that its federated image repository had flagged approximately 14,000 potentially duplicated asset pairs during a routine hash-comparison sweep run at the end of June 2026. Institutions have until 31 July 2026 to review flagged files and confirm whether items should be merged, archived or permanently deleted. The CSUC's repository currently holds assets contributed by more than 40 partner organisations across Catalonia.

Separately, the Museu Nacional d'Art de Catalunya (MNAC) on Montjuïc confirmed this week that it completed the first phase of its own image deduplication review on 30 June, covering its publicly accessible digital collection portal. The museum's digitisation team has been working with open-source perceptual hashing tools to flag near-duplicate scans — cases where the same artwork was photographed twice under slightly different lighting conditions and both versions were published online without cross-referencing. Phase two, covering internal archive files not yet published publicly, begins in September 2026.

The practical stakes are not trivial. Under Spain's Ley de Propiedad Intelectual, institutions that publish duplicate images with conflicting attribution data risk creating ambiguity about rights ownership — an issue that has already generated administrative disputes in at least two Catalan cultural bodies in the past 18 months, according to publicly available reports from the Institut Català de les Empreses Culturals (ICEC). Storage costs are also a factor: cloud hosting for municipal image archives in Barcelona is billed per gigabyte, and early estimates from the Ajuntament's 2025 digital audit, published on the open-data portal Open Data BCN, suggested that redundant files were consuming somewhere between 8 and 12 percent of total allocated storage across municipal departments — a figure officials want to reduce before the next budget cycle.

What organisations and individuals should do now

For smaller cultural venues and neighbourhood associations — particularly those operating in Gràcia, Poblenou and the Eixample, where a high concentration of creative and civic organisations manage their own digital assets independently — the message from city technicians is to audit before the summer slowdown. The Ajuntament's Barcelona Cultura office has published a step-by-step guidance document on its website directing smaller entities toward free deduplication tools compatible with the city's preferred open-source stack. A drop-in technical session is scheduled for 15 July 2026 at the Fab Lab Barcelona on Carrer Pallars in Poblenou, open to registered non-profit and civic organisations.

The mid-year checkpoint puts Barcelona roughly on track with the schedule laid out in the Pla de Transformació Digital, but technicians are candid that the hardest work lies ahead: reconciling image assets held by semi-autonomous bodies that do not fall neatly under municipal authority. How the city handles that jurisdictional complexity will determine whether the deduplication project delivers durable results or simply moves the problem to a different server.