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.
Category: | |
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: |
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:
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@ billon: Thanks ... and updated ;)
v2.4.1
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.
v2.3
This program is great for general PNG compression, but for web graphics that will see many downloads over time, I use RIOT (http://www.portablefreeware.com/index.php?id=1821)
V2.0
.. 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)
V2.0
Great program. Thanks tun for the ini config trick.
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
[Engine]
BackupOldPngFiles = 1
KeepInterlacing = 0
KeepBackgroundColor = 0
AvoidGreyWithSimpleTransparency = 1
[Screenshots]
UseDefaultDir = 1
CustomDir =
MaximizeCompression = 1
AskForFileName = 0
[Window]
X = 345
Y = 215
Width = 521
Height = 300
============== end =====================
If we don't create ini file, it is working fine.
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.
Agree, 65% processor time and start after 2 minutes on P4/2GHz? No way, this PngOptimizer must be optimized.
There is a v2.4.2 for x64 !
v2.4.1