weltweit
worldwide
Spread, valid, or taking place all over the world.
Das Unternehmen agiert weltweit und hat Büros auf allen Kontinenten.
The company operates worldwide and has offices on every continent.

worldwide
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worldwide
Spread, valid, or taking place all over the world.
Das Unternehmen agiert weltweit und hat Büros auf allen Kontinenten.
The company operates worldwide and has offices on every continent.

The word is a simple and logical compound of 'die Welt' (the world) and 'weit' (wide/far). It literally means 'as far as the world.'
Diese Probleme gibt es nicht nur hier, sondern auf der ganzen Welt.
These problems exist not only here, but all over the world.
'Weltweit' (worldwide) can be used as an adverb (describing a verb) or as an adjective (describing a noun). As an adjective before a noun, it must be declined.
Das Internet ermöglicht weltweite Kommunikation.
The internet enables worldwide communication.
Common combinations are 'weltweit bekannt' (known worldwide), 'weltweit führend' (a worldwide leader), or 'weltweit verfügbar' (available worldwide). It is often used in the context of business, technology, and globalization.
Dieses Produkt ist jetzt weltweit verfügbar.
This product is now available worldwide.
international
'international' and 'weltweit' both have to do with more than one country. Use 'international' when several countries are involved or something takes place between countries, for example a team, an agreement, or a conference. 'weltweit' is stronger: it means all over the world or almost everywhere in the world. Learners can easily confuse the words because both refer to more than just one country. As a practical rule: when several countries are involved, 'international' often fits; when something is spread across the whole world, 'weltweit' is usually better.

Diese Firma verkauft ihre Produkte weltweit.
This company sells its products worldwide.
An der internationalen Schule lernen Kinder aus vielen Ländern zusammen.
At the international school, children from many countries learn together.