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There are many types of different image formats and some of those most commonly
found on the Internet are JPEG, GIF, BMP, TIFF and PNG. Each image format has its own
purpose such as GIF is used for animated images, JPEG for high quality photos which
automatically gets degraded after each save or even a resize, while our favorite PNG is
best used on small and transparent pictures. Another huge advantage in PNG files is
they’re lossless meaning you can compress PNG’s without losing quality.
You can easily find many tools on the Internet to compress PNG files but most, if not all
of them produce different file sizes due to the algorithm unless they are using the same
library/technology. Reducing the image file size to the maximum helps to save
bandwidth cost, time to download and even achieving a higher Google PageSpeed
score because “optimize images” is one of the priorities. In this article we’ve put 13 free
PNG compressor tools (online, command line, desktop) to the test to find the one that
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13 Free Tools to Optimize and Compress PNG
to Reduce Image Size
 Raymond  Updated 3 years ago   Graphics  14 Comments
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produces the smallest file size.
Two 8-bit and 24-bit PNG files are compressed using the 13 free image compression
tools listed below. The list consists of command line tools, desktop programs and online
services. Command line tools are more flexible for automation in batch files but require
you to type in the full command including option switches and path. A desktop tool is an
easier to use program with a graphical user interface that normally requires a few
mouse clicks to work. Finally online services are applications hosted on remote servers
where the processing is done on the server and the user doesn’t need to install any
third party software.
To view the compression test results and summary, they can be found on page 2.
Command Line Tools
1. advpng
advpng is part of AdvanceCOMP that contains multiple free utilities to recompress PNG,
ZIP, MNG and GZ files. advpng hasn’t been updated since 2005 but the compression
speed and results will surprise you. Older machines with slower hardware specifications
takes slightly longer to process while the newer multi-core CPU takes only a second to
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produce amazing results.
advpng maximum compression command:
Download AdvanceCOMP 
2. OptiPNG
OptiPNG is another open source command line PNG compressor that supports
Windows and Linux operating system. Both stable and development versions are
available to download. Do take note that the maximum command line compression for
the stable and development versions are slightly different. The highest level of
compression for the OptiPNG stable is -o7 while the development is only -o6. If you try
to force -o7 on the development build, you will still get the same file size as -o6.
OptiPNG stable maximum compression command:
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advpng.exe -z4 file.png

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OptiPNG development maximum compression command:
Download OptiPNG 
3. Pngcrush
Pngcrush is also a commandline application that attempts to optimize PNG images by
trying out different compression levels and PNG filter methods. If you use the -brute
switch, Pngcrush will test the image with 148 methods to find the one that gives the
best compression.
Pngcrush maximum compression command:
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optipng.exe -o7 file.png

optipng-hg-latest-win32 -o6 file.png

Pngcrush.exe -brute file.png output.png

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Download Pngcrush 
4. PngOptimizerCL
PngOptimizer comes with a simple graphical user interface program and all you need to
do is drag the images that you want to compress to the program’s window, and also a
command line application that runs in command prompt. Other than cleaning up
wrong/useless information on PNG to reduce the file size, it can also support animated
PNG format (apng) which is still uncommon today. You can either specify the exact file
name to optimize or can even use the asterisk character as a wildcard.
PngOptimizerCL maximum compression command:
Download PngOptimizerCL 
5. PNGOUT
PngOptimizerCL.exe -file:”file.png”

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Unlike most of the command line PNG optimizers, PNGOUT is not open source because
the compression algorithm is incorporated into their commercial GUI version called
PNGOUTWin that has batch processing and multi-core CPU support. Although it is not
open source, you can find pre-compiled binaries for Windows, Linux, BSD and Mac OS X.
PNGOUT is one of the easiest to use because by default it uses the highest Xtreme
compression algorithm for optimization without specifying an additional command line
switch.
PNGOUT maximum compression command:
Download PNGOUT 
6. ScriptPNG
pngout.exe file.png

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ScriptPNG is actually a batch file that is capable of running up to 10 PNG compressors
to optimize an image file. Selecting the ultra brute option number 9 will use the
maximum compression options to produce the smallest file size but taking more time to
complete the optimization process. All you need to do is drag and drop your PNG files to
the program from Explorer and followed by selecting one of the 9 available options.
Download ScriptPNG 
7. TruePNG
TruePNG only supports PNG files unlike some of the PNG compressors above that can
attempt to convert other image formats such as JPEG and GIF into PNG if it is able to
achieve a smaller file size.
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TruePNG maximum compression command:
Download TruePNG 
Desktop Software
8. PNGGauntlet
PNGGauntlet is actually a front-end tool that uses 3 different PNG optimizers (PNGOUT,
OptiPNG, and DeflOpt) to further compress PNG files instead of normally using just 1.
The usage of 3 compressors does increase the time taken to compress the PNG files
but definitely yields a smaller file size. A nice feature found in PNGGauntlet is the ability
to automatically queue multiple files for batch processing. The default options from the
TruePNG.exe input.png /o max

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Tools menu are already best (maximum) settings unless you want to preserve the PNG
metadata, use grayscale color type and etc. Microsoft .NET Framework 4 is required to
run.
Download PNGGauntlet 