Pixels versus vectors
Normal pictures are made of pixels and become blurry or blocky when enlarged. SVG is a vector format: it describes shapes with mathematical outlines, so it stays perfectly sharp at any size — from a tiny website icon to a large banner, T-shirt print or vinyl sticker.
What happens when you convert
Your picture is reduced to at most 1600 pixels wide, its colours are grouped into the number you choose — 2, 8, 16, 32 or 64 — and the outline of every colour area is traced into vector shapes. The result is a standard SVG file that opens in browsers, Inkscape, Illustrator, Figma, Canva and cutting-machine software.
Which pictures trace well
Logos, icons, signatures, stamps, cartoons, clip art and simple illustrations with flat colours and clear edges trace beautifully. Photographs do not: they turn into thousands of tiny shapes, giving a huge SVG that looks like a painting rather than the original photo.
Common problems and how to fix them
Edges look jagged: start from a larger, sharper picture. Too many small specks appear: choose fewer colours, or remove the background first. The file is very large: use 2–16 colours for logos. Thin lines disappear: very thin lines may be lost — thicken them in the original before tracing.
Good habits
Use the cleanest original you have, choose the lowest number of colours that still looks right, and tidy the result in a vector editor before printing or cutting.