SVG — the SVG format — is completely separate from JPG. Whereas JPG saves photos as a grid of pixels, SVG stores illustrations as mathematical definitions of shapes, lines and colors. Which means SVG graphics can be displayed at every size — from a 16x16 pixel favicon to a billboard — without pixelation.
Transforming JPG to SVG is a technique known as image vectorization, and it is especially useful for logos and simple graphics.
Before converting JPG to SVG, it is necessary to realize more info what happens. A JPG is a raster image — a fixed grid of image pixels. SVG files are a mathematical image — a collection of paths that a browser displays as the graphic.
The conversion works great for simple images with distinct shapes and few colors — logos, icons, silhouettes and flat artwork. Results are poor for photographic images with thousands of colors.
For best output, Adobe Illustrator's Image Trace tool offers the most control. Load the image in Illustrator, select the graphic, open the Image Trace dialog and choose an relevant setting.
Try alljpgconverters.com offering a totally free online JPG to SVG converter without software needed.