nomacs is a free 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 ourĀ tracker.

nomacs 2.2

you know we like numbers… so we release nomacs 2.2 on 11.11. This version fixes a few issues you reported and adds cool features such as reading images from zip (docx, xlsx, pptx) archives, or a full metadata panel. The full changelog is:

  • Reading images from ZIP (+ Office Documents e.g. docx, xlsx, pptx)
  • Metadata panel (displays all metadata of an image)
  • Thumbnail panel layout (Vertical or Undock)
  • Notes (you can now take and display notes which are written to the image metadata)
  • Private mode which does not save any settings including recent files
  • Option which disables check for updates
  • Option which disables logging of recent files/folders
  • Additional RAW files added (including Pentax [PEF], Samsung [SRW], Hasselblad [3FR] and Sigma [X3F])
  • JPG2000 read/write fixed for large files (windows with setup only)
  • Resize dialog fixes
  • File order fixed for Linux/Unix
  • Segfault fixed if ‘fast thumbnail preview’ is checked
  • Saving images without extension (linux only) fixed

– the nomacs team