SVG — the SVG format — is completely separate from JPG. JPG encodes pictures as a raster of pixels, SVG stores images as mathematical descriptions of shapes, lines and colors. This means SVG files work at every size — from a 16x16 pixel favicon to a billboard — without quality loss.
Converting JPG to SVG is a process referred to as image vectorization, and it is especially useful for logos and flat artwork.
Prior to converting JPG to SVG, it is important to realize how the process works. A JPG is a bitmap image — a static grid of pixels. SVG files are a mathematical image — a set of mathematical instructions that applications renders as the image.
Results are excellent for simple images with distinct shapes and few colors — icons, logos, symbols and line art. It works less well for complex photos with complex gradients.
For quality conversion, Adobe Illustrator's Image Trace function provides the most flexibility. Load the image in Illustrator, click the graphic, open the Image Trace dialog and choose an suitable option.
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