APNG Optimizer

APNG Optimizer is a straightforward piece of software that you can use to optimize your animated PNG files using predefined settings. It uses a compression algorithm based on APNG Assembler, a command-line tool designed to create animated PNG files from PNG and TGA image sequences.

No setup necessary

There is no installation involved, which makes the program portable. It means that you can drop the downloaded .exe file anywhere on the disk or copy it to a removable storage unit, in order to run APNG Optimizer on any machine effortlessly, without having to install anything.
It doesn't need DLLs to run, integrate new entries in the system registry, or create files on the HDD without your approval

Simple interface and options

As far as the GUI is concerned, it opts for a small window with a simple design and intuitive layout, enabling you to pick an animated PNG image with the aid of the file browser.
After pointing out the output directory and filename, you can start the optimization operation with one click. This process shouldn't take long, depending on the size of the graphic file. Once it's over, you can open the new image to verify quality results as well as compare its size with the original photo.

Evaluation and conclusion

As we expected, it didn't hog system resources in our tests, thanks to the fact that it needed a low amount of CPU and RAM to work properly. There were no stability issues, as it didn't freeze, crash or indicate errors.
On the other hand, APNG Optimizer has a light set of options and doesn't make room for customization. For example, batch processing is unsupported, so you're restricted to optimizing only one image at a time. However, it gets the job done and be used by anyone who wants to optimize their APNG files with minimum effort.