Question about after using trial version

This is K. Jo

I am using MP3TAG trial version right now.
I write this letter as I have a question.

If I do not use this application after the trial version, will I not be charged?
Or is it automatically renewed and charged?

Your prompt response would be highly appreciated.

Best regards,
K. Jo

It would then automatically ask you to either buy a license or it will stop working. You'll not automatically charged.