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OptiPNG 0.7.7

Compress PNG files without losing image quality

by Mike Williams

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Based on 0 ratings
License: Open Source
Operating Systems: Windows 10, 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: 28 December 2017
Watchlist: Add download to my watchlist
Downloads To Date: 937
Developer: Cosmin Truta
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Compress PNG files without losing image quality

OptiPNG is a tiny command line tool which optimises PNG files, often reducing their size but without affecting image quality.

Our tests showed varying results. OptiPNG barely made any difference at all with some files, occasionally cutting others by 20% or more, but on average saved around 5%.

Using the program can be as simple as entering something like:

optipng image.png

OptiPNG then tries various parameters to find which delivers the smallest file size. But beware, if there are savings to be made then it overwrites the original file.

If you'd prefer to keep the source file, use:

optipng -keep image.png

It'll be preserved as image.png.bak.

Multiple images may be specified on the same command line:

optipng -keep image1.png image2.png image3.png

There are various other options to control the compression strategy, how and where any saved files are written. Enter optipng -h to find out more.

If you'd prefer a GUI, note that PNGGauntlet provides a shell for OptiPNG, and adds a couple of other tools to deliver even greater savings.

What's new?

 * Upgraded libpng to version 1.6.34.
 * Upgraded zlib to version 1.2.11-optipng.
 * Upgraded minitiff to version 0.2.
!! Fixed a buffer overflow vulnerability in the GIF decoder.
   [Reported by Joonun Jang]
!! Fixed an integer overflow vulnerability in the TIFF decoder.
   [Reported by Jaeseung Choi]
 ! Fixed the build on macOS High Sierra.
   [Reported by various users]
   [Fixed by Yuen Ho Wong and Friedrich Preuss]
 ! Fixed the build on DJGPP.
 * Disallowed out-of-bounds values in rangeset options.


A powerful PNG optimizer, easy to use (by command line standards) but with plenty of low-level control for experts.

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WhatsApp Messenger 2.18.51

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).

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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 2.18.51

• When you receive a link to an Instagram or Facebook video, you can now play it right within WhatsApp. With picture-in-picture, you can also keep watching the video while you navigate to another chat.
• If you're a group admin, you can now remove admin rights from other participants. Select the admin in "Group Info" and tap "Dismiss As Admin."
• Group admins can now choose who can change a group's subject, icon and description by going to "Group Info" and tapping "Group Settings."