to oblige / commit
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to oblige someone to do something
To force someone to do something through a law, contract, or moral rule.
Der Vertrag verpflichtet den Mieter, die Wohnung am Ende zu renovieren.
The contract obliges the tenant to renovate the apartment at the end.
to commit oneself to something
To voluntarily promise or agree to take on a specific task or responsibility.
Er hat sich verpflichtet, einmal pro Woche ehrenamtlich zu arbeiten.
He has committed himself to doing volunteer work once a week.
to sign someone
To bind someone, usually an athlete or artist, to a club or theater through a contract.
Der Fußballverein konnte einen international bekannten Stürmer verpflichten.
The football club was able to sign an internationally known striker.
The word contains 'die Pflicht' (duty). To 'verpflichten' (to oblige) someone literally means to give them a duty or bind them to a duty. This origin helps you understand the core meaning.
Das Gesetz verpflichtet alle Bürger, Steuern zu zahlen.
The law obliges all citizens to pay taxes.
The verb can be used reflexively or non-reflexively. 'Sich verpflichten' (to commit oneself) means that you voluntarily give yourself a task. 'Jemanden verpflichten' (to oblige someone) means that another person or a law imposes the duty.
Ich habe mich verpflichtet, bei dem Projekt zu helfen.
I have committed myself to helping with the project.
The obligation is always expressed with the preposition 'zu' and the dative. The structure is '(sich) zu etwas verpflichten' (to commit/oblige oneself to something).
Die Firma verpflichtete sich zur Lieferung bis Ende des Monats.
The company committed itself to delivery by the end of the month.
When 'verpflichten' (to sign) is used without the preposition 'zu', it usually means to put a professional under contract. This usage is typical for sports clubs, theaters, or orchestras.
Der Verein hat eine neue Spielerin für die nächste Saison verpflichtet.
The club has signed a new player for next season.
to force
Both words can express that someone has to do something. Verpflichten usually refers to a duty imposed by law, contract, or rule, without necessarily implying immediate force. Zwingen, by contrast, emphasizes pressure, violence, or authority against the affected person's will.
Das neue Gesetz verpflichtet die Vermieter, die Heizungen regelmäßig zu prüfen.
The new law obliges landlords to inspect the heating systems regularly.
Der starke Rauch zwang die Bewohner, das Gebäude sofort zu verlassen.
The heavy smoke forced the residents to leave the building immediately.
