If you are a flash developer you certainly came across a requirement to convert multiple png files into swfs. The swf file format has the advantage that you get a picture with jpg compression PLUS transparency channel - what is really nice.

There isn't much software online which could do this task but in the end I found out that this can be done using JSFL.

(If you don't know JSFL is - it is an JavaScript program to control Flash IDE - anything you do with mouse and keyboard can be done using JS commands.)

So inspired by a JSFL script by mrdoob which converts just a single file, I wrote a new script which takes all PNGs in a directory and converts them into SWFs. You can also choose the compression quality.

Script Image: