11st photos for the Seoul open-marketplace grid

11st representative-image rules inside Seoul's open-marketplace tier

11st (11번가) is SK Telecom's open marketplace and sits in Korea's open-marketplace tier at roughly the same level as Gmarket, with Coupang dominating the national market above them. Its image spec follows the Korean open-marketplace looser convention rather than Coupang's strict transparency and pure-white enforcement. The recommended representative-image size is 1000×1000 pixels at a 1:1 square aspect, with 600×600 as the partner-consensus minimum. Accepted formats are JPG, JPEG, PNG, and GIF, and while the precise file-size cap is not explicitly published in the 11st 셀러오피스 documentation, the partner-consensus 2 MB cap applies in practice. The one rule 11st publishes with unusual precision is the frame prohibition — 테두리 사용 불가 (border usage prohibited) — which applies to decorative frames, double-borders, and coloured bands around the representative image. White background is recommended on the main, with a documented exception for high-quality editorial imagery (화보 이미지) that can carry a non-white background when the quality clearly justifies it. A separate 50–70% product-fill guideline exists for banner and display advertising surfaces — that rule does not apply to the catalogue main image and the preset routes the two cases correctly.

The practical reality for Korean sellers is that 11st clusters with Gmarket and the Marketplace tier of Coupang under one shared workflow. A single 1000×1000 white JPEG export serves all three. The only Korean marketplace that diverges is Coupang Rocket Grow (로켓그로스), which demands a transparent PNG main because Coupang re-composites every Rocket Grow product onto its own grid, and that path lives in the Coupang preset. For the 11st-and-friends cluster, this preset locks the square canvas to 1000×1000, keeps the file under the partner-consensus 2 MB cap, defaults to pure white, and strips decorative frames to clear the 테두리 사용 불가 rule at the export stage. The sRGB colour space kills the cream cast that Korean home-lightbox lighting introduces. Text overlays, price callouts, and promotional badges stay off the representative image — that matches 11st's published prohibition and keeps the same catalogue safe for cross-listing on Gmarket and Coupang Marketplace. SK Telecom's loyalty integration (T멤버십, OK캐쉬백) is 11st's distinctive commercial angle rather than an image-rule variable, so the same preset covers loyalty-tied promotional slots as well as standard listings.

Why 셀러오피스 compliance hinges on the 테두리 rule

11st's moderation at upload is lighter than Coupang's, but the 테두리 사용 불가 rule is the one that routinely trips sellers who have previously exported catalogues for Gmarket or Cafe24-based shops where decorative frames are tolerated. A preset that strips frames automatically at export closes the most common rejection path on 11st without any seller-side vigilance. Paired with the 1000×1000 square and the 2 MB cap, the output matches the 11st representative-image rulebook without requiring the seller to memorise the PDF guide from 셀러오피스. The same export then serves the broader Korean open-marketplace cluster — Gmarket on ESM Plus, Coupang Marketplace, and Qoo10 KR — at no additional effort.