How this converter works
An SVG is not a picture; it is a set of drawing instructions. Your browser is the best SVG renderer there is, so this tool simply has it draw the vector onto a canvas and export the pixels as a JPG at the quality you pick. Small icons are automatically rendered at 800 pixels wide or more, which vectors handle with zero blur. Nothing is uploaded; everything happens locally.
What to expect from the output
Two things change in the vector-to-pixels jump. First, transparency becomes white: JPG has no alpha channel, so the usually-transparent SVG background is filled with white. Second, the image gains a fixed size: it will no longer scale infinitely like the vector did. Both are usually exactly what the destination wants, because the places that reject SVG (marketplaces, forms, office documents, most CMS uploads) want a plain raster photo format.
Why so many uploads reject SVG
SVG files can contain scripts, which makes them a security risk for any site that displays user uploads, so most platforms simply ban the extension. That is why the logo your designer sent you as a crisp little .svg cannot be uploaded to the marketplace, the invoice tool or the slide deck. Converting a JPG copy at a generous size keeps the sharpness where it matters and satisfies the upload form.