São Paulo Races to Purge Duplicate Images From Its Digital Infrastructure — and the Gap With Rivals Is Closing

São Paulo's city hall announced last month that its Secretaria Municipal de Inovação e Tecnologia had flagged more than 340,000 duplicate image files clogging the municipal document management system — a backlog that had accumulated across at least a decade of fragmented digital record-keeping. The announcement, made in a June technical bulletin distributed to department heads, set a 90-day deadline for all secretariats to run automated deduplication protocols across their internal servers.

The problem is not trivial. Duplicate images — redundant copies of the same photograph, scanned document, or infographic sitting in multiple folders or databases — inflate storage costs, slow down search systems, and create version-control nightmares for public servants trying to retrieve accurate records. In a city of more than 12 million residents generating daily administrative volume across 31 subprefeituras, the scale of the issue is hard to overstate.

What São Paulo Is Actually Doing

The deduplication drive sits under a broader program called SP Digital 2025–2028, the current technology roadmap published by the Nunes administration. The Secretaria de Inovação e Tecnologia, headquartered near Avenida Paulista, has contracted a local company to run perceptual hashing tools — software that identifies visually identical or near-identical images even when file names differ. The pilot ran first on the Arquivo Histórico Municipal, based in the Liberdade neighbourhood, where staff had long complained about redundant digitised photographs of the city's late-19th and early-20th century infrastructure.

A secondary rollout is under way at the Empresa de Tecnologia da Informação e Comunicação do Município de São Paulo, known as PRODAM, which manages the back-end of dozens of city-facing digital services. PRODAM's systems handle everything from property tax records to health-post appointment portals — platforms where a miscategorised or duplicated image attached to the wrong citizen file can have real administrative consequences.

The city has not yet published a full cost figure for the exercise, but municipal technology officers have said publicly that cloud storage expenditures across city secretariats exceeded R$18 million in 2025, and that eliminating redundant files is expected to reduce that figure by a meaningful margin before the end of the current fiscal year.

How São Paulo Stacks Up Globally

London's Government Digital Service began a similar exercise in 2023, targeting duplicate assets inside the GOV.UK content management system. The British effort was largely automated and handled roughly 2 million redundant files over 18 months, with results published in a transparency report the following year. Seoul's Smart City Division, part of the Seoul Digital Foundation, launched a deduplication initiative in early 2024 focused on its urban surveillance and public-space photography archives — a politically sensitive category given privacy law constraints.

New York City's Department of Information Technology and Telecommunications has been running incremental deduplication across borough-level databases since at least 2022, though a comprehensive citywide audit has not been publicly confirmed.

Where São Paulo differs from all three cities is in the degree to which the effort is being driven from the centre rather than left to individual departments. The 90-day mandate from the Secretaria de Inovação e Tecnologia is compulsory, not advisory — which is either an advantage or a recipe for corner-cutting, depending on how much technical capacity each secretariat actually has. Several smaller subprefeituras, particularly in the Zona Leste, are understood to lack dedicated IT staff capable of running even basic file audits without external support.

São Paulo's tech ecosystem does offer one structural advantage: the city sits inside Latin America's densest concentration of software companies, many of them clustered around Vila Olímpia and the Faria Lima corridor, and local procurement rules make it faster to engage Brazilian vendors than would be the case in more bureaucratically rigid environments. That proximity to talent has helped the PRODAM pilot move at a pace that surprised some observers inside city government.

The 90-day window closes in late September. Departments that miss the deadline face an internal compliance review under SP Digital's governance framework, though the consequences beyond that review have not been spelled out publicly. Citizens who use city digital services — particularly those accessing health records or property documentation through the SP156 portal — may notice faster load times and fewer broken image links as the clearout progresses. The harder test will come when city hall publishes its storage cost figures for the fourth quarter and has to show whether the work actually moved the needle.