Gibson — PNG compression tool on Windows Gibson provides a robust PNG compression toolkit for Windows-based applications. It can decode and compress PNG or JPEG images to almost any format, and can save image files on-the-fly with support for compression algorithms like x-loss, lib, Lima and drama. Gibson is open source, and all source codes are publicly available 8 Free PNG Conversion Tools — Convert & Bulk Compress PNG images Image Converter — Convert Image File To PNG Images conversion tool is one of the most important tools for any web artist. It helps you convert between different image types such as images, text and graphics and other popular file formats like OGG, JPEG, GIF, and BMP. Tiny PNG — Compress/Decompress PNG Tiny PNG makes it super easy to compress and decompress PNG images. It also supports the decompression of both PNG and BMP images. It has a clean UI but still offers all the options and options to manipulate the output files. Use the tool on your site, in your browser or even on desktop computers. 7.1.1 7.1.1 adds some extra options for Windows users (in addition of the ones in 7.0.1): + Support for multiple resolutions per image A new command was added for Windows users where you can specify the maximum number of image resizable before an image will be considered as not fit for the source. If you set this on image resolution of 10M by default, and set the image resolution to 10M it will be displayed properly and in the browser. + Support for transparent PNG A “transparent” PNG is one where the alpha layer is not fully transparent. It is generally useful if you have some images, and some other and don't want to mess your PNG file up. 7.1.1 introduces support for transparent alpha layers which is a bit nicer. + New settings to improve image quality and reduce size A new settings panel has been added for those of you who really don't want the PNG file to be downloaded all the time when an image is visited. So you can configure your images better, or change the settings. + Fixed some bugs and changed some behavior 7.1.0 7.0.0 A new command for Windows users was added where you can choose the minimum/maximum value of an image dimension.