SVG — the SVG format — is completely separate from JPG. JPG encodes pictures as a grid of pixels, SVG encodes illustrations as mathematical descriptions of paths and colors. This means SVG images scale to any size — from a small icon to a massive print — without quality loss.
Changing JPG to SVG is a operation called vectorization, and it is very beneficial for illustrations and flat artwork.
Prior to converting JPG to SVG, it is essential to understand what the conversion actually does. JPG files are a pixel-based image — a static grid of pixels. more info SVG files are a mathematical image — a collection of paths that a browser displays as the artwork.
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, Illustrator's Image Trace function provides the most flexibility. Open your JPG in Illustrator, click the image, access the Image Trace panel and select an appropriate preset.
Use alljpgconverters.com offering a completely free online JPG to SVG converter without software needed.