gratis
free
Without having to pay for it; free of charge.
Zu jeder Bestellung über 50 Euro erhalten Sie den Versand gratis.
With every order over 50 euros, you receive shipping for free.

free
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free
Without having to pay for it; free of charge.
Zu jeder Bestellung über 50 Euro erhalten Sie den Versand gratis.
With every order over 50 euros, you receive shipping for free.

The word 'gratis' (free) is a special adjective that does not change its form. It is not declined and does not take endings, even when it comes directly before a noun.
Im Museum gibt es heute gratis Eintritt für alle.
At the museum today, there is free admission for everyone.
Unlike most adjectives, 'gratis' (free) can also stand directly after the noun it refers to. It also often appears at the end of a sentence.
Wir haben zwei Kinokarten gratis bekommen.
We got two movie tickets for free.
The word 'gratis' (free) is used very frequently in advertising and special offers. It always signals that something costs nothing and is meant to attract customers.
Kaufen Sie zwei, erhalten Sie das dritte Produkt gratis.
Buy two and get the third product free.
free
'frei' and 'gratis' can both mean that you do not have to pay anything. In this meaning, they are synonyms. 'gratis' is very clear and is often used in advertising, offers, or everyday language. 'frei' has many other meanings, for example available or unrestricted. That is why confusion can occur without clear context. If the topic is only the price, 'gratis' is especially clear; however, 'Eintritt frei' (free admission) is a fixed and natural expression.

Beim Termin haben die Eltern ein Heft gratis bekommen.
At the appointment, the parents received a booklet for free.
Heute ist der Eintritt ins Schwimmbad für Kinder frei.
Today admission to the swimming pool is free for children.