Convert SVG to PDF

Each SVG becomes a page, rendered at the detail you choose. Being honest about the trade: SVG is vector and this renders it to pixels, so the result will not stay sharp when enlarged the way the original does. Drawing SVG paths into PDF vectors properly needs a full SVG renderer, which this is not — so raise the detail setting if the result will be printed large.

Will it stay sharp when I zoom in?

Not the way the SVG does. It is rendered at a fixed detail. Choose a higher one for print.

Why not keep it as vector?

That needs a full SVG renderer. Rendering to pixels is honest about what it is rather than approximating paths badly.

Can I convert several at once?

Yes. Each becomes its own page.