PngOptimizer v2.7 Updated

webfork on 26 Nov 2021
  • 382KB (uncompressed)
  • Released on 26 Nov 2021
  • Suggested by Replika

PngOptimizer is an easy-to-use program to compress common graphics formats to PNG format with no quality difference. Files can be added one at a time or in batch to the program icon or window. Images can also come from the clipboard by pressing CTRL+V while the application is in focus.

Cross-platform with clients available for Linux. A CLI version is available.

Graphics formats supported include BMP, GIF, TGA, as well as further compressesing PNG files. Animated GIF and PNG files (APNG) are also supported. Size decrease for PNG files varies widely on the original editor, but GIF and BMP conversions can be as much as 40% and 95% respectively.

Alternatively, PngOptimizer Portable automatically switches between 32-bit and 64-bit and adjusts the screenshots path.

Runs on:WinXP / Vista / Win7 / Win8 / Win10
Writes settings to: Application folder
Stealth: ? Yes
Unicode support: Yes
Path portability: No
License: GPL
How to extract:
  1. Download the ZIP package and extract to a folder of your choice
  2. In the same folder, create a text file called PngOptimizer.ini
  3. Launch PngOptimizer.exe

Optionally, to save images from the clipboard to the PngOptimizer application folder, right-click on the window and select Custom for the target directory and enter a period (.) in the box below.
Similar/alternative apps: FileOptimizer
What's new? v2.7 Latest change:
  • ensure the window is fully visible on Windows
  • bad conversion of palette mode PNGs to grayscale

11 comments on PngOptimizer  The Portable Freeware Collection Latest Entries Feed

DarkShadow 2014-06-10 16:35

There is a v2.4.2 for x64 !


Checker 2014-05-30 09:29

@ billon: Thanks ... and updated ;)


webfork 2013-05-31 23:08

Note about the 2.3 update: definitely takes full advantage of multi-processor systems. I tested it on Win7x64 with an i7 quad core and it got very close to 90% (few programs can do that). Definitely a big speed bonus over time there and good to see those kind of optimizations in freeware.


webfork 2011-11-03 17:35

This program is great for general PNG compression, but for web graphics that will see many downloads over time, I use RIOT (


Paul 2011-05-10 01:01

.. with just a few random characters like the asdf example in 'PngOptimizer.ini' .. the new update works great on Win98 (or the whole ini template)


Webfork 2009-11-11 20:06

Great program. Thanks tun for the ini config trick.

tun 2009-02-21 09:15

Create the 'PngOptimizer.ini' with the following content and save in 'UTF-8' format

================ start ===============
; PngOptimizer configuration file
; This file is encoded in UTF-8

BackupOldPngFiles = 1
KeepInterlacing = 0
KeepBackgroundColor = 0
AvoidGreyWithSimpleTransparency = 1

UseDefaultDir = 1
CustomDir =
MaximizeCompression = 1
AskForFileName = 0

X = 345
Y = 215
Width = 521
Height = 300
============== end =====================

tun 2009-02-21 09:10

If we don't create ini file, it is working fine.

Jon Wright 2009-02-20 12:43

Just downloaded 1.8 - same problem. Nothing's appeared and processor is using 100% on one core. Three minutes now so it'll have to be killed.

Teo 2009-02-20 00:41

Agree, 65% processor time and start after 2 minutes on P4/2GHz? No way, this PngOptimizer must be optimized.

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