Convert .png image to .gif image

In my project, I have so many .png images. They are working properly in Firefox but when I run my project on Internet Explorer, i get white background in tha开发者_开发问答t images. I have used some Image converters but they are also not giving the proper result. After converting, the resolution gets changed.

So can any one suggest me some good Converter that will not change the resolution of image and will also convert the .png images to .gif images?

This is one of the most annoying bugs in IE6 - it doesn't support transparent PNGs.

Note that if you convert your PNG files to GIF images, they are likely to look uglier, as GIF files can only have 256 colors and do not support alpha-transparency.

IE6 features an AlphaImageLoader filter that can be used to render transparent PNGs correctly; this is a much better solution than converting to GIF. (Unless you need transparent repeating backgrounds)
See here.

Did you try Paint.NET? It has the ability to convert to several formats.

But keep in mind that the gif color palette is way smaller than PNG. Gif images can have up to 256 colors.

Which version of IE are you using? I thought that IE7 and 8 (8 for sure) support png images with transparency.