Mumbai Tackles Thousands of Corrupted Images Clogging Digital Records

Thousands of duplicate photographs, scanned property documents, Aadhaar-linked ID images, building permit files, are sitting in redundant clusters across the Brihanmumbai Municipal Corporation's digital storage infrastructure, slowing down public-facing portals and inflating server costs at a time when the BMC is simultaneously managing the digitisation push for Dharavi redevelopment records and the metro network's integrated ticketing rollout.

The problem is not new, but civic technology officials say the scale has grown sharply since 2023, when the BMC accelerated its migration of legacy paper records to cloud storage under the Smart City Mission. Duplicate image files, created when documents are scanned multiple times, uploaded across different departments, or pulled from vendor systems that don't cross-check existing entries, now account for a significant portion of redundant data sitting in municipal servers at the corporation's Mahapalika Marg headquarters and at the disaster recovery node maintained in Vashi, Navi Mumbai.

How Mumbai Compares to Other Cities Tackling the Same Problem

Singapore's Government Technology Agency, GovTech, addressed a comparable data-duplication challenge across its Singpass identity platform by deploying hash-based deduplication protocols as early as 2021, cutting redundant file volume by a reported 34 percent within eighteen months. São Paulo's municipal government ran a parallel exercise through its Secretaria Municipal de Inovação e Tecnologia in 2022, though that effort was complicated by inconsistent scanning standards across borough offices, a problem Mumbai administrators would recognise immediately.

London's Government Digital Service has been dealing with duplicate image records in its planning portal since at least 2020, when a parliamentary committee flagged that repeated uploads of building survey photographs were generating conflicting version histories in the national planning database. The fix there required not just software but a standardised upload protocol enforced across all thirty-three London boroughs, a governance challenge that maps closely onto Mumbai's situation, where Ward offices from Bandra to Borivali operate with different legacy software environments and scan equipment of widely varying vintage.

Mumbai has not yet published a comprehensive deduplication audit, but the BMC's IT department did acknowledge in its 2025-26 annual budget presentation, tabled in February 2026, that digital storage costs had risen by approximately 22 percent year-on-year, partly attributed to unstructured data growth. The corporation allocated ₹47 crore to IT infrastructure upgrades in that budget cycle, a figure that covers server expansion, cybersecurity, and data management tools collectively.

Dharavi Records and the Practical Stakes

The political sensitivity is sharpest around Dharavi. The Dharavi Redevelopment Project, overseen by a special purpose vehicle under the Maharashtra government, has been digitising survey records, household photographs, and eligibility documents for residents since 2023. Activists and legal aid organisations working in the settlement, including groups operating out of Sion and Kurla, have raised concerns about whether duplicate or corrupted images in the eligibility database could affect residents' claims to rehabilitation housing. A single mismatched photograph attached to the wrong survey entry can delay a family's case by months in the adjudication process.

The BMC is reportedly in discussions with at least two private technology vendors about deploying automated image-deduplication tools that use perceptual hashing, a technique that identifies visually identical or near-identical images even if the files themselves have different names or metadata. Similar tools are already in use at the Maharashtra Land Records department in Pune for cadastral map management.

For Mumbai residents dealing with the practical downstream effects, delayed property mutation certificates, stuck building plan approvals, stalled redevelopment eligibility decisions, the advice from civic technology observers is blunt: file duplicate complaints through the BMC's 1916 helpline if an online application shows your documents as missing or unverified, since the problem often traces back to a file that exists in the system under a conflicting image entry rather than being genuinely absent. The BMC's online citizen portal at mcgm.gov.in allows status tracking, though processing timelines remain erratic across wards. The broader fix, if Mumbai follows the path of Singapore and London, will require both the software and the political will to enforce uniform standards across every office that touches a scanner.