Tokyo Leads Asia in Scrubbing Duplicate Images From Public Records, But Lags Behind Seoul and Singapore

Tokyo's municipal government acknowledged this spring that duplicate imagery — identical or near-identical photos appearing multiple times across official city databases, tourism portals, and public housing registers — had become a measurable administrative problem. The Metropolitan Government's Digital Services Bureau, based in the Nishi-Shinjuku high-rise district, confirmed it had begun a systematic audit of visual records held across 23 ward offices, targeting an estimated several hundred thousand redundant image files accumulated since the city's digitisation push accelerated after the 2021 Olympics.

The timing matters. Tourism arrivals into Tokyo have surged to record levels through 2025 and into 2026, with Shinjuku, Asakusa, and the waterfront Odaiba district generating enormous volumes of photographed content submitted to official platforms — hotel registration systems, event permit databases, and the Tokyo Convention and Visitors Bureau's promotional archive. Each submission point creates new opportunities for duplication. Separately, the city's housing market pressure in central wards like Minato and Chiyoda has pushed local governments to update property listing imagery more frequently, compounding the problem.

How Tokyo Compares Internationally

Seoul tackled a similar issue three years earlier. The Seoul Metropolitan Government ran a dedicated de-duplication programme through its Smart City division starting in 2023, applying perceptual hashing — a technique that flags visually similar images even when file names differ — across its public data portals. Singapore's Government Technology Agency, GovTech, embedded automated duplicate-detection into its Whole-of-Government data platform by 2022, meaning new image uploads are screened before they enter the system rather than cleaned up retroactively.

Tokyo's approach, by contrast, has been largely reactive. The Digital Services Bureau is running its audit manually in several wards and using semi-automated tools in others, with no city-wide standard tool confirmed as of July 2026. That inconsistency has drawn attention from digital governance researchers at institutions including Waseda University's e-Government unit in Shinjuku. London and Amsterdam have faced comparable challenges: London's Datastore portal underwent an image audit in 2024 tied to its updated open data policy, while Amsterdam completed a full media library overhaul for its city tourism platform, I Amsterdam, in late 2025.

The scale of Tokyo's problem is tied directly to money. Japan's yen has remained weak through 2025 and into 2026, making Tokyo one of the world's most price-competitive major cities for foreign visitors. The Japan Tourism Agency reported that inbound visitors to Japan exceeded 36 million in 2025, a national record. A significant share of that traffic concentrates in Tokyo, and every hotel, short-term rental, and event venue submitting images to city-linked platforms adds to the duplicate load. Storage costs are not trivial: enterprise-grade cloud image storage in Japan runs roughly ¥3 to ¥5 per gigabyte per month depending on the provider, and unchecked duplication inflates those costs over time across dozens of city departments.

What Comes Next for Ward Offices and Residents

The Minato Ward office, which manages property and tourism records for one of Tokyo's highest-footfall districts, confirmed it is piloting an automated image-review step within its building permit documentation workflow — one of the first wards to trial a preventive rather than remedial system. Shibuya Ward has separately updated its public event submission portal to reject file uploads that are exact binary duplicates, a basic but useful filter.

For residents and businesses submitting images to official city systems — from housing benefit applications to small-business grant platforms — the practical advice from the Digital Services Bureau is straightforward: use standardised file naming tied to application reference numbers, avoid resubmitting previously uploaded files, and check portal guidance before uploading event or property photography. Several ward portals now display a notification if an uploaded image matches one already on file.

The broader audit is expected to conclude by the end of Tokyo's 2026 fiscal year in March 2027. Whether the results prompt a city-wide standard protocol — the kind Seoul and Singapore built from the top down — is the live question inside the Nishi-Shinjuku offices of the Digital Services Bureau right now.