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PngOptimizer 2.4.1

Shrink PNG files without losing image quality

by Mike Williams

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Based on 0 ratings
License: Freeware
Operating Systems: Windows 7 (32 bit), Windows 7 (64 bit), Windows 8, Windows Server, Windows Vista (32 bit), Windows Vista (64 bit), Windows XP
Languages: English
Software Cost: Free
Date Updated: 12 June 2014
Watchlist: Add download to my watchlist
Downloads To Date: 512
Developer: Hadrien Nilsson
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PngOptimizer 2.4.1
Shrink PNG files without losing image quality

PngOptimizer rewrites PNG files in an efficient way, stripping out any redundant information, hopefully reducing their size without any loss of image quality.

The program really couldn't be much easier to use. Drag and drop your target images onto PngOptimizer and it compresses each one in turn. The new files are saved using the same name and location as the source, while the original files are renamed as a backup (file.png becomes _file.png).

As a bonus, PngOptimizer also supports the import of BMP, TGA and GIF files, also converting these to PNG in much the same way.

Does it work? We gave PNGOptimizer a really tough test, pointing the program at 25 high resolution photos - an average of 8MB each - in PNG format. These took a little while to process, unsurprisingly, but the results weren't bad at all, with our files losing an average of 4% each.

While that may not sound very much, it's still around 320KB per image, certainly enough to be useful. And if you're compressing very small PNGs then the percentage drop can seem much more impressive. We pointed the program at our 50 test PNG web graphics, and it cut their size by 40%, which could noticeably improve web page download times.

If you do have any problems with the compression, or would like the program to work a little differently, then there are some options available. Right-click the PngOptimizer window, select PNG Settings, and you can decide which parts of a PNG file are kept, and which get removed (textual data, background colour, physical pixel dimensions, more).


We would like more control over the output folder and file names (or any control at all, in fact), but otherwise PngOptimizer provides a quick and easy way to reduce the size of most PNG files.

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Spotlight: Free Full Software

Spektrel Art 1.0.0

Free Full Commercial Software

Spektrel Art is a stand-alone program and Photoshop plugin which transforms digital photos into "magical art that glimmers and gleams with intersecting lines of tapered light".

What does that mean? Essentially it applies a configurable mix of effects, enhancing edges, smoothing backgrounds and emphasizing colours. Take a look at the thumbnail for one example, and the official product page has more.

Spektral Art works much like any similar tool. Open an image, click one of the thumbnails to apply a particular preset, or click a few buttons and drag some sliders to fine-tune the results.

There's surprising scope for variation, too. For example, just switching from the "Light" to "Dark" theme can transform a bright and friendly image into something dark and sinister, at least in some cases (results vary depending on the source image).

Please note, the demo version doesn't allow images to be saved.

SPECIAL OFFER: as we write, the developer is offering Spektral Art for free. The offer expires August 29th. Please note that you must provide your name, address and phone number to receive your free license.