
kostenfrei
free of charge
Without having to pay for it; free.
Der Versand ist bei Bestellungen über 50 Euro kostenfrei.
Shipping is free of charge for orders over 50 euros.
free of charge
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free of charge
Without having to pay for it; free.
Der Versand ist bei Bestellungen über 50 Euro kostenfrei.
Shipping is free of charge for orders over 50 euros.
The word is a clear compound of 'Kosten' (costs) and 'frei' (free). It literally means 'free of costs' and is therefore easy to understand.
Die Teilnahme am Webinar ist für alle Mitglieder kostenfrei.
Participation in the webinar is free of charge for all members.
'Kostenfrei' (free of charge) is very often used as an adverb to describe a verb. In this case, it remains unchanged in the sentence.
Sie können die Software kostenfrei herunterladen und testen.
You can download and test the software free of charge.
This word tends to belong in a formal or commercial context. It is often found in offers, on websites, or in official notices.
Wir bieten Ihnen eine kostenfreie Beratung an.
We offer you a free consultation.
free
Gratis and kostenfrei both mean that you do not have to pay for something. Gratis sounds particularly casual and promotional in advertising and offers, while kostenfrei sounds more factual and neutral. Gratis works well in an advertisement, while kostenfrei is often more suitable for straightforward information.

Bei dieser Aktion erhalten Sie eine kostenfreie Tasse Kaffee.
As part of this promotion, you will receive a cup of coffee free of charge.
Bei unserer Aktion erhalten Sie eine gratis Tasse Kaffee.
As part of our promotion, you will receive a free cup of coffee.