4 viewer windows stitched together

nomacs is a free image viewer for windows, linux, and mac systems, which is licensed under the GNU General Public License v3. nomacs is small, fast and able to handle the most common image formats including RAW images. Additionally it is possible to synchronize multiple viewers. A synchronization of viewers running on the same computer or via LAN is possible. It allows to compare images and spot the differences (e.g. schemes of architects to show the progress).

Please use the Report Bug menu entry to report a bug or request a feature. We will appreciate your feedback!

I have been looking at all the image viewers I could find for Fedora 18 and Nomacs was easily the nicest!

nomacs 2.0 beta

April 1, 2014 : 16:02

since we have changed a lot of code in the loading and saving routines, we decided to release a beta version prior to the first 2.0 release. if you find any bugs, please let us know. new features of this beta are:

  • Threaded file loading/saving
  • UPnP support that allows for detecting nomacs in WLAN networks
  • Option for syncing all actions
  • Auto file updating (without locks)
  • Full exif support on linux (fixes issue #192)
  • White list to automatically connect with your computers
  • Gamma correction on down sampling (fixes #322)
  • New (improved) cacher
  • Improvements in the Thumbnail Preview

you can download and test the beta here.

– the nomacs team


nomacs 2 – announcement

March 14, 2014 : 18:07

we are currently working on nomacs 2.0. please let us know if you are missing any important feature.

– the nomacs team

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nomacs @ GSoC 2014

March 5, 2014 : 10:02


the CSE at Vienna UT has been accepted at GSoC. Hence, if you are a student and you enjoy C++ coding more than a beach in summer, you are welcome to apply for nomacs at GSoC.

– the nomacs team

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nomacs 1.6.4

February 20, 2014 : 11:56

so the news are always the same on this page – again we have updated nomacs.
this version contains a few new features:

  • Auto Adjustment/Auto Normalization/Invert Image functions added
  • Flip (Horizontally/Vertically) functions added
  • Recursive Folder Scan
  • Fast(er) RAW loading with embedded thumbnail extraction
  • save for web dialog – that allows for easy resizing and saving
  • the window position is remembered even if the window was snapped previously
  • a Run button is added to the new Open With dialog – hence it is similar to the old one

we hope you enjoy this version — even more — than the old nomacs versions

– the nomacs team

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Critical Bugfix

January 15, 2014 : 19:49

we have found a critical bug which – in some cases – prevents nomacs from starting correctly. If you experience this issue, we would recommend to update nomacs to version 1.6.3.┬áThe issue applies only to the Windows versions. Users of other OS can safely enjoy version 1.6.2. Sorry for any inconveniences caused.

For the Matlab users who do not enjoy the default image display behavior of Matlab: this script allows you to directly display images in nomacs.

– the nomacs team


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nomacs 1.6.2

December 20, 2013 : 16:10

the new nomacs is like the man in that video.
this is probably one of the last nomacs for Windows XP
the new version fixes issues mostly concerning the new thumbnail bar but also adds a new open with behavior and a random sort order.

– the nomacs team

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nomacs 1.6.0

October 15, 2013 : 15:51

thumb preview smallthumb preview large
sunny day in Vienna…
This is perfectly not related to the the release of nomacs 1.6.
New features are:

  • Grid View for Thumbnails
  • Image Mosaicing Tool
  • Gif Player (Pause Animated Images and View Frame by Frame)
  • WebP on all platforms
  • Customizable Mouse Wheel
  • French Translation

… and we fixed all bugs reported (except for 5 bugs).

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September 2, 2013 : 15:53

nomacs was down for the last two days – sorry

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features, features, features

July 11, 2013 : 16:07

since there were (hardly any) no bugs in the last release we focused on new features and skipped again at least one bug fix release. the highly praised features include:

  • Multi Page TIFF support – with export & convert to multiple files option
  • Explorer Panel – for navigation
  • Crop Toolbar – additional options for cropping
  • Sort Images – by date modified/created
  • …and some small features requested by you

– the nomacs team


Ask Toolbar

July 11, 2013 : 13:58


Shall we add Ask Toolbar to nomacs installer?

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