Take a close look at what is being offered and perhaps download some tool or app that appears to meet your requirements. And will run on your OS provided that your system meets the recommended minimal specifications.
Be very sure that you have good backups of the original files.
Also place copies of the files in a test folder. Try out/test any conversion tools that seem applicable.
Be very careful with the downloads and installation process. Many 3rd party products attempt to download and install other apps as well. Or, if not, make some configuration changes to your system.
Download and test only one product at a time. If there is any sign of something amiss - Cancel is your friend.
I tried finding an app that can do that, but i can't find one, which
Is how i got here.
I only found apps/websites that offer converting one file at a time,
which is useless to me since i have approx. 1500 files.
I'm looking for batch convertion.
Thanks for your reply!