OnTheMarket photo specs for UK agent feeds (2026)
OnTheMarket's practical photo envelope is landscape-biased and feed-driven. Standard listings carry 10–20 photos, landscape orientation, 1200×800 minimum at a 3:2 aspect ratio (matching Rightmove), JPG accepted across every CRM integration. OTM inherits from the same RMV3 BLM feed that Rightmove and Zoopla ingest, so the CRM step (Reapit, Jupix, Alto, Acquaint, Arthur, EstatesIT, WP Property Hive) is where the spec actually gets enforced — HEIC is rejected upstream, files over ~10 MB are capped, vertical phone shots are flipped or cropped. The Primary Image is the single highest-leverage slot: it anchors the search card, the Only With Us countdown tile, and the Spotlight slot when an agent pays to boost. A 4K 3:2 master is the only clean way to feed all three major UK portals from one export.

