Formal:
* Votre dévoué (m), Votre dévouée (f): This is the most formal way to sign off a letter and is often used by professionals. It means "Your devoted servant" and expresses respect.
* Avec mes salutations distinguées: This translates to "With my distinguished greetings" and is a polite and formal way to end a letter or email.
* Sincèrement: This means "Sincerely" and is a neutral but polite option.
Informal:
* Cordialement: This translates to "Warmly" and is a friendly and informal way to sign off.
* Affectueusement: This means "Affectionately" and is a very friendly and informal way to sign off.
* Amitiés: This means "Best regards" and is a good option for friends and close acquaintances.
Other options:
* Bien à vous: This literally translates to "Well to you" and is a general way to sign off.
* Meilleures salutations: This means "Best regards" and is a good neutral option.
The best choice will depend on your relationship with the person you are writing to and the formality of the situation.