conformer

Conformer means to shape or adapt something to match a model or standard, but it's overwhelmingly used reflexively — se conformer à (to comply with, to abide by): se conformer aux règles, se conformer à la loi. Outside the reflexive form it's rare and formal.

• Il faut se conformer au règlement intérieur. — You have to comply with the internal rules.
• Cette entreprise s'est conformée aux nouvelles normes environnementales. — This company has complied with the new environmental standards.
• Le format du document a été conformé aux exigences du client. — The document's format was adapted to the client's requirements.

Learners often reach for suivre or respecter for 'comply with a rule,' when se conformer à is the more formal, precise register match — especially in legal, administrative, or corporate French; don't drop the à after se conformer, since it always takes an indirect object with à.