I'm just kidding.

我只是在开玩笑。

《柯林斯英汉双解大词典》

I'm just kidding. Yes, you can.

好吧，如果我玩“三人行”你不能参加。

youdao

ALLEN: I'm just kidding. Don't be so nervous.

艾伦：开玩笑的，别那么紧张。

youdao

If there's no New Orleans left the - and I'm just kidding, Lord.

NPR: New Orleans Family Heads North

I'm sure there's -- gosh, people just pulled down their blog posts on -- no, I'm kidding.

WHITEHOUSE: Press Briefing