Berlin's Digital Archives Are Full of Duplicate Images — Officials and Experts Say the Problem Is Bigger Than Anyone Admitted

Berlin's public sector is sitting on millions of duplicate image files scattered across departmental servers, archival databases, and urban planning portals — and technologists working inside the system say the cleanup bill is rising faster than the budget set aside to pay it. The Senatsverwaltung für Stadtentwicklung, Bauen und Wohnen acknowledged earlier this year that its FIS-Broker geoportal alone had identified thousands of redundant raster files during a January 2026 audit, some of them triplicated across legacy systems dating to the early 2000s.

The timing matters. Berlin is mid-way through its Digital Strategy 2030, a framework the SPD-led coalition endorsed to modernise the city's administrative backbone. Bloated image libraries slow down the geospatial tools that planners in Mitte, Friedrichshain-Kreuzberg, and a dozen other Bezirke rely on daily to process building permits, rezoning applications, and housing assessments — exactly the tools under pressure as the city tries to accelerate construction amid a rental-market crisis that has pushed average asking rents in Prenzlauer Berg above €18 per square metre.

What the Officials and Technologists Are Actually Saying

Experts at the Zuse Institute Berlin on Takustraße in Dahlem have been vocal about the problem's structural roots. Researchers there have pointed to a lack of unified metadata standards across Senate departments as the core driver of duplication: when separate offices digitised physical archives independently — often between 2005 and 2015 — no central deduplication protocol existed to flag when identical images landed in multiple repositories under different filenames. The result is redundancy at scale.

The Berlin-Brandenburg office of the open-data advocacy group Wikimedia Deutschland has pushed for the city to adopt open image standards that would make automated deduplication easier, arguing that the current proprietary formats used by several Bezirk portals create what practitioners in the field call a "vendor lock-in trap" — a situation where switching to efficient replacement tools requires renegotiating expensive licensing contracts. Those contracts, according to budget documents presented to the Abgeordnetenhaus in March 2026, run into the low seven-figure range annually across all affected departments.

Staff at the Landesarchiv Berlin on Eichborndamm in Reinickendorf describe the practical consequence bluntly: archivists spend measurable portions of their working week manually verifying whether an image flagged for upload already exists somewhere in the system. One internal workflow review, completed in February 2026 and cited in a Senatsverwaltung für Kultur briefing paper, estimated that duplicate-checking consumed roughly 12 percent of digitisation staff hours — time that would otherwise go toward cataloguing the backlog of uncatalogued physical records.

Proposed Solutions and What Comes Next

The city's IT service authority, ITDZ Berlin, has been tasked with rolling out a centralised digital asset management system by the fourth quarter of 2027. The system is intended to give every Senate department a single searchable image repository with automated hash-based deduplication — meaning the software compares the actual pixel data of each file, not just the filename, before allowing a new upload. A pilot covering the Stadtentwicklung department and two Bezirk offices is scheduled to begin in September 2026.

Critics of that timeline, including technology policy voices inside the Abgeordnetenhaus, argue that 2027 is too far off given the strain on planning systems right now, particularly as the housing debate accelerates. The Koalitionsvertrag signed in 2023 committed the SPD-led government to measurable improvements in permit-processing speed, and duplicate-image bottlenecks are a concrete, if unglamorous, obstacle to that goal.

For Berliners interacting with public planning tools — checking a zoning map on the FIS-Broker portal, browsing the Landesarchiv's digital collections, or submitting documentation for a building project in Neukölln — the practical advice from experts is straightforward: use the official portals but expect inconsistencies, and when filing documents that include images, submit files in formats explicitly listed on the relevant Bezirk's portal guidelines to avoid contributing to the duplication problem yourself. The cleanup, officials concede, will take years. But the conversation, at least, is now happening in the open.