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nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images.

nomacs features semi-transparent widgets that display additional information such as thumbnails, metadata or histogram. It is able to browse images in zip or MS Office files which can be extracted to a directory. Metadata stored with the image can be displayed and you can add notes to images. A thumbnail preview of the current folder is included as well as a file explorer panel which allows switching between folders. Within a directory you can apply a file filter, so that only images are displayed whose filenames have a certain string or match a regular expression. Activating the cacher allows for instantly switching between images.

nomacs includes image manipulation methods for adjusting brightness, contrast, saturation, hue, gamma, exposure. It has a pseudo color function which allows creating false color images. A unique feature of nomacs is the synchronization of multiple instances. With this feature you can easily compare images by zooming and/or panning at the exactly same position or even by overlaying them with different opacities.
nomacs is licensed under the GNU General Public License v3 and available for Windows, Linux, FreeBSD, Mac, and OS/2. If you want to report any bugs or request new features please use our tracker.

nomacs 2.4.4

this version is mainly a response to all your suggestions and bug reports – thank you for supporting us in increasing nomacs’ performance and usability. New features include:

  • Improved batch processing (you can now add images from multiple folders)
  • New Metadata HUD panel (you can dynamically choose entries)
  • nomacs respects your default proxy settings (e.g. when [manually] updating)
  • The portable version ships with a qss file (so you can customize almost everything)

the most important fixes are:

  • Default strings are now translated
  • Linux file sorting is (hopefully) fixed by now
  • Gamma correction for rescaling is now 16 bit (smooth gradients)
  • Zoom to Fit added (replaces ‘Reset Zoom’)
  • Saving of multiple tabs
  • UTF-8 encoding for image notes
  • General stability improvements

[EDIT] thanks to R3gi we have noticed that nomacs 2.4.4 has slow loading times on Windows 7. That is why we updated only these versions to nomacs 2.4.5. Sorry for any inconveniences caused!

— the nomacs team

nomacs 2.4.4 written by markus average rating 5/5 - 2 user ratings