Windows

http://shareware.cnet.com/shareware/0-13628-500-1516431.html?tag=st.sw.16165_501_1.lst.titledetail


Copy th eabove link COMPLETELY and there is a link to download this file, I beleive its 1.5MB or so, it will do a whole folder at a time, many other features and extensions available. Hope this helps.

Eric

JASC Software makes a product called Paint Shop Pro that will allow you to do entire batch conversions from one image type to another really quickly. For example, if you have a directory of jpegs and you want them to be gifs, then it will do this for you saving a lot of time. You can even opt to keep both formats if you want.

I use it a lot for this. It also has a cool feature that lets you view as thumbnails the entire contents of a directory of images and just double-click on the one that you want to enlarge.

You can download and evaluate for 30 days at http://www.jasc.com/product.asp?pf%5Fid=001&mscssid=8Q6EQ8UC84SR2PMR00SPN10L3DCT9QC5

Just copy and paste that link exactly as it is to the address field of your browser to go to their site.

Your question is the very reason why I have invested the small funds to purchase and keep upgrading this very powerful and versatile program called Paint Shop Pro. I was quite tired of trying to figure out how to take one type of image and convert to another for different effects. Now I find I have little problems in this area. Image conversion is not the ONLY advantage to Paint Shop Pro, but it's the main reason I bought it.

Try http://www.dadaware.com/ I don't remember if batch conversion works even under Windows (the products was born as OS/2 software).

Get Visua95 (you might find it at nonags.com)
it is freeware and will convert many image types, the nice thing is that you can select as many files as you want and it will convert them all.