
zwingend
mandatory
Absolutely necessary, obligatory, or unavoidable.
Für diese Position ist ein Hochschulabschluss zwingend erforderlich.
For this position, a university degree is mandatory.
mandatory / compelling
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mandatory
Absolutely necessary, obligatory, or unavoidable.
Für diese Position ist ein Hochschulabschluss zwingend erforderlich.
For this position, a university degree is mandatory.

compelling
Describes an argument or proof that is logical, conclusive, and impossible to refute.
Die vorgelegten Beweise waren so zwingend, dass der Angeklagte verurteilt wurde.
The evidence presented was so compelling that the defendant was convicted.
The adjective 'zwingend' (mandatory/compelling) is derived from the verb 'zwingen' (to force, to compel). It describes something that has such strong logical or necessary 'force' that you cannot ignore it.
Aus familiären Gründen musste er die Reise zwingend absagen.
For family reasons, he absolutely had to cancel the trip.
In the meaning 'notwendig' (necessary), 'zwingend' (mandatory) is often combined emphatically with other adjectives. Common phrases are 'zwingend erforderlich' (mandatory/absolutely required), 'zwingend notwendig' (absolutely necessary), or 'zwingend vorgeschrieben' (strictly required by law/rules).
Eine Anmeldung für den Kurs ist zwingend erforderlich.
Registration for the course is mandatory.
When it comes to logic, 'zwingend' (compelling) often appears with nouns related to argumentation. Typical examples are 'ein zwingender Grund' (a compelling reason), 'ein zwingendes Argument' (a compelling argument), or 'ein zwingender Beweis' (compelling proof).
Das ist kein zwingendes Argument für eine Gesetzesänderung.
That is not a compelling argument for a change in the law.
necessary
Notwendig and zwingend can both say that something is needed for a goal. Zwingend is stronger and leaves no other option or exception, while notwendig can also describe indispensability based on practical considerations. Use notwendig for a general prerequisite and zwingend when it is absolutely unavoidable.

Für das Gelingen des Projekts ist eine gute Planung zwingend.
Good planning is absolutely essential for the project to succeed.
Für das Gelingen des Projekts ist eine gute Planung notwendig.
Good planning is necessary for the project to succeed.