ImageAlpha

ImageAlpha is a powerful tool that significantly reduces the file sizes of 24-bit PNG files. This is achieved by applying lossy compression and converting the files to a more efficient PNG8+alpha format.

These images are compatible with iOS, all browsers, and even degrade gracefully in IE6. ImageAlpha can achieve better quality than similar functions in Adobe Fireworks. This is due to its use of the latest pngquant and pngnq-s9, as well as an alpha-channel-aware posterizer.

How to use ImageAlpha

1. Drag a true-color PNG image into the main part of the window.
2. Small images should be converted instantly.
3. If the image is large, a progress spinner may be visible for a few seconds.

Batch Processing

Batch processing is available from the command line. ImageAlpha is based on pngquant. You can find the compiled pngquant executable in the ImageAlpha.app/Contents/Resources directory.

Open Source

ImageAlpha is free, open-source software under the terms of the GPL v2. We welcome your contributions! Please check out or fork the source code (Python) and make improvements. If you need assistance, feel free to contact us.