How is the vector conversion service works?

I have lots of designs to be converted to vector file. And i was wondering whether


i can get vector sample file before i pay and how is the vector conversion service works?|||If you have a lot of designs to be converted, I would suggest learning Adobe Illustrator, and converting them yourself, it would save you a ton of money over paying someone to do it.





And you usually can't see a sample of the vector conversion, because it takes a while to do it, so nobody is going to waste their time to convert it just to see if you'll like it. However most services have portfolios, so you can see their prior work.