I am using Percona's xtrabackup to take backup of my online databases. Is there a way to convert the backup database files into a SQL dump similar to a backup created using mysqldump ?
Do you mean it's taking a file level copy of
If that's the case, restore the files somewhere and change the MySQL data directory to where you have restored
Then restart MySQL and you'll be using your recovered databases which you can use
If you're using InnoDB tables you may need to read through this.