I work in the printing industry where having vector artwork for a job is paramount when it comes to the best production output. Often times clients will send me a PDF file that contains a raster image rather than the vector format I need.
The first thing I do when I open an image file in Adobe Illustrator is I view it in Outline move to examine what is vector and what is not. You can see the difference below
View → Preview:
View → Outline:
Since you can see all the "lines" of the artwork, it's easy to confirm that this artwork is 100% vector.
I don't always have Illustrator available to me, so I'm looking for a PDF viewer (either browser based or stand-alone is fine) that can replicate this functionality. Is there any such software that can help with this workflow?