kostenloser
Kostenloser is the attributive form of the German adjective kostenlos, meaning free of charge. It is used before masculine singular nouns and follows standard German adjective declension, depending on whether a determiner precedes the noun and on the noun’s case. For example, ein kostenloser Download (nominative, masculine, indefinite) and der kostenlose Download (nominative, masculine, definite). In the accusative, einen kostenlosen Download and den kostenlosen Download are possible with a masculine noun.
In full form, the endings are as follows for common masculine nouns: nominative singular with no determiner
Usage and nuance: kostenloser is widely used in advertising, product descriptions, and service offers to indicate
Etymology: kostenlos derives from kosten (to cost) and los (without), literally “without costs.” Similar compounds exist