None of the methods aren't for free. The apps I've suggested are subscription-based. You can however use certain functions for free with the application. There are a few online converters that are free, however I don't recommend them because there's no term as "free" in the world. They'll have access to your information and sell it to third parties to earn a profits. Paid-for tools are more secure and trustworthy. Therefore, I would recommend using paid tools to protect your security.