SVG is a drawing rather than a grid of pixels: shapes, paths and text described in XML, so it stays sharp at any size. That makes it right for logos and icons and useless for photographs. Converting it to a raster format fixes the size it will ever be.
Every conversion below runs in this page, on your own machine. Nothing is uploaded, there is no queue, and there is no account to make. Pick a target format, or just drop a SVG file above and choose afterwards.