Posty-psc.cz provides an online directory and search tool for postal codes and post offices across the Czech Republic. Its database covers cities, municipalities, smaller localities, urban districts, and streets, helping visitors identify the correct postcode for a specific place or address. Users can search by location, selecting a region or district and then narrowing the results to a municipality or neighborhood, or search by entering a postcode digit by digit. A separate address-based search supports cases where different post offices serve different parts of the same street or district.

The site explains that Czech postcodes consist of five digits, commonly written with a space after the first three, and correspond to particular post offices and service areas. This is especially useful in larger towns, where the correct code may depend on the precise address. The database is updated every three months, according to the site. Posty-psc.cz also offers a directory of Czech Post collection points and links to a related postcode search for Slovakia.