Pdf to image converter without ghostscript

I am looking for a dotnet / nodejs library to convert pdf to image (to be used as a thumbnail). I know there are loads of disucssion already been done on this topic but most of them use ghost script which I can not use as because it's license terms (GNU GPL).

there are some online services as well but the pdfs are confidencial, so I have no liberty to use them.

I am looking for MIT or Apache license Or do not mind paid version of API. does any one used or know such library/API ?