TL;DR: This service is provided for your convenience, without any warranty of any kind. In an ideal world, if you use common sense, it will convert your document securely and privately, and this site will try it's best, but make no guarantees whatsoever.
Like any other website, your use of this service is subject to these terms, meaning if you use the service, you agree to be bound by these terms. That also means, that if you do not agree with all of the terms here, you may not use the service.
Assuming, "You" are the person uploading a document to be converted (your "Content"), and "the Service" is the website you are currently on to convert your Content, specifically:
This Service is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, or non-infringement. In no event shall the owners, maintainers, or copyright holders be liable for any claim, damages, or other liability, whether in action of tort, contract, or otherwise, arising from, out of, or in connection with the service or its use.