Vector image with fixed line width

I would like to create/export a vector image with fixed line widths, independent of the zoom level.
I’ve already found the possibility to use vector-effect="non-scaling-stroke" in an SVG image, which makes the line width independent of my transformations.
But that is not what I want. I need to create an image file that I can send to someone else, while he/she can open it in web/pdf/image browser, zoom in, while keeping the line width fixed.