Kleinanzeigen.com is an online classifieds marketplace described as a virtual flea market, where individuals and businesses can advertise items and connect with potential buyers or other interested users. The platform lets visitors search listings or post their own advertisements for free, with listings presented as going online immediately. Users can buy, sell, give away, or exchange new and used goods, and the site states that transactions are offered without commissions.

Its categories cover a broad range of needs, including cars and motor vehicles, property, rentals, jobs, services and courses, leisure and personal contacts, vouchers, tickets, food and drinks, and general marketplace items such as clothing and household appliances. The service also promotes local searching across German cities, helping people find or offer goods and services in their area. Visitors can create an account, sign in, save listings to a watchlist, and access help and safety information. Kleinanzeigen.com presents itself as a straightforward platform for local classifieds, bringing together private and commercial users for buying, selling, sharing, and swapping.