How do you say in French I speak but read French?

Here are a few ways to say "I speak but read French" in French, with different levels of formality and nuance:

Formal:

* Je parle français, mais je le lis aussi. (I speak French, but I also read it.)

* Je comprends le français, mais je ne le parle pas couramment. (I understand French, but I don't speak it fluently.)

Informal:

* Je comprends le français, mais je ne parle pas beaucoup. (I understand French, but I don't speak much.)

* Je peux lire le français, mais je n'arrive pas à parler. (I can read French, but I can't speak it.)

* J'ai un niveau de français correct à l'écrit, mais je ne suis pas très à l'aise à l'oral. (I have a decent level of French in writing, but I'm not very comfortable speaking.)

More nuanced:

* Je parle un peu français, mais je suis plus à l'aise à la lecture. (I speak a little French, but I'm more comfortable reading.)

* J'ai appris le français par la lecture, mais je n'ai pas eu l'occasion de beaucoup le parler. (I learned French through reading, but I haven't had the opportunity to speak it much.)

You can choose the phrase that best suits your situation and the level of formality you want to convey.