How Do You Reply to Merci?

The usual response to merci is de rien (You're welcome – literally, It's nothing) or il n'y a pas de quoi. In a more formal context, you could say Je vous en prie or Je t'en prie.

How do you respond to you're welcome in French?

The default way to say “you're welcome” in French – De rien. “De rien” is by far the easiest way to reply to “thank you”. You can't go wrong really, no matter who you're talking to or the level of formality.

How do you say you're welcome in French informal?

The informal “you're welcome”: je t'en prie. Like 'de rien', which is certainly the most casual way to say you're welcome in French, 'je t'en prie' is another informal way to respond to someone who expressed their gratitude towards you. It is most common amongst very close friends and family members.