Autotracer is a free online image vectorizer. It can convert raster images like JPEGs, GIFs and PNGs to scalable vector graphics (EPS, SVG, AI and PDF). No registration or email required.

Max. file size for upload is 6 MB.
Supported file types: jpg, png, pdf, jpeg.
Max. dimension: 5000x5000
Number of colors the image will be reduced to before it is vectorized.
Range: 1-256.