Kleinanzeigen.com is an online classifieds marketplace that helps people find, buy, sell, give away, and exchange new and second-hand goods and services. Described as a virtual flea market, the platform lets users browse listings or place an advertisement for free, with listings available immediately. It serves both private individuals and commercial users and features advertisements from cities across Germany, including Berlin, Hamburg, Munich, Cologne, Leipzig, and Stuttgart.

The site covers a broad range of categories, including cars and motor vehicles, real estate, jobs, services and courses, clothing, household appliances, contacts and leisure activities, vouchers, tickets, food and drinks, and rentals. Users can search by location and category, save listings to a watchlist, and access help and account sign-in or registration options. Kleinanzeigen.com presents its service as free and without commissions, supporting local buying and selling as well as giving items away or trading them. The website also provides contact information, safety guidance, terms, payment details, and a newsletter option.