How do you convert png to svg?

PNG images are compressed bitmapped, raster images, where the picture is defined by co-ordinate pairs of colours for every pixels.

SVGs, on the other hand, don't use pixels; instead, they use primitives. This means that scaling doesn't negatively affect quality.

Try checking out Inkscape. It's free and comes with a built-in vectorizer. Here's a list of steps (adapted from http://wiki.inkscape.org/wiki/index.php/Potrace):

1. Import your PNG, using .
2. Ensure that the imported image is selected.
3. Under the menu, click . (Hotkey is Alt+Shift+B.)
4. Click "Update" on the right-hand side.
   • Brightness cutoff: at 1.0, generates a black box. Basically, the higher, the more is included.
   • Multiple scans→Colors: Change the number of scans. At 2 scans, it's nearly grayscale; 16 is enough to show relatively accurate colour. (Note that the more scans, the more objects, causing higher filesize!)
5. Modify settings until you feel the conversion is good. (I've played with the following settings; they should be good for normal use:)
6. Press "OK." Wait until "OK" is re-enabled.
7. You're done!