Inkscape opens Illustrator files, which are based on PDF, fine, so not sure about this.
Just use SVG as the file format, then any browser can open it.
Just use SVG as the file format, then any browser can open it.
Sites that just need to put a brand logo up as part of a content update are just going to resize the logo from available PNGs.
I imagine in any more complicated cases someone with Illustrator is doing the job.