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PngOptimizer 2.4.1

Shrink PNG files without losing image quality

by Mike Williams

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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: 617
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

WhatsApp Messenger 2.18.102

Free Full Commercial Software

WhatsApp Messenger is the world's most popular instant messaging app for smartphones.

You can use it to send and receive text and voice messages, photos, videos, even call your friends in other countries, and because it uses your phone's internet connection it might not cost you anything at all (depending on whether you'll pay data charges).

It's easy to set up and use. There's no need to create and remember new account names or pins because it works with your phone number, and uses your regular address book to find and connect you with friends who use WhatsApp already.

You can talk one-to-one or in group chats, and because you're always logged in there's no way to miss messages. Even if your phone is turned off, WhatsApp will save your messages and display them as soon as you're back online.

There's plenty more (location sharing, contact exchange, message broadcasting) and the app is free for a year, currently $0.99/ year afterwards.

What's New in Version 2.18.102 

• Introducing stickers! You can now download and send expressive stickers in chats. Tap the new "sticker" icon while in a chat to get started. You can also tap the "+" icon to download more sticker packs. If you'd like to create your own stickers for WhatsApp, visit to get started.
• You can now easily search for GIFs right from within a chat. Just tap the "sticker" icon in a chat and then tap the "GIF" icon at the bottom.
• Consecutive Voice Messages will now play in sequence, so you don't have to press play on each message.