nomacs toolbar

Image Viewing

  • supports the most common image formats including RAW (see table below)
  • fast thumbnail preview (Screenshot)
  • zoomable grid preview of thumbnails
  • display exif information (Screenshot)
  • framless view (Screenshot)
  • change transparency of windows (Screenshot)
  • display overview/histogram/file info (Screenshot)
  • file filtering/searching/sorting
  • improved anti-aliasing (cool for displaying highly textured images)
  • hide menubar and toolbar
  • slideshow
    • image information (e.g. date created)
    • play/pause with user defined time interval
    • adjustable background color

Image Editing

  • crop images (Screenshot)
  • resize images (Screenshot)
  • pseudo color function (Screenshot)
  • color adjustments (brightness/contrast/saturation …)
  • multi page TIFF export (Screenshot)
  • rotate images
  • drag and drop images
  • automatically save screenshots
  • delete/rename images
  • create mosaic image (Howto)
  • set wallpaper (windows only)

Viewer Synchronization

  • synchronize multiple instances (Screenshot) (Howto)
    • synchronized zooming
    • synchronized panning
    • synchronized next/previous file
    • overlay of two or more instances (with changing opacity)
    • arrange synchronized instances
  • synchronize multiple instances in the LAN (Howto)
    • synchronized zooming
    • synchronized panning
    • images can be sent over LAN connection
File Extension Read Write Comment
jpg x x
png x x
tif x x including Multi Page
bmp x x
ppm x x
xbm x x
xpm x x
jpeg2000 x x Windows only
webp x x
gif x
ico x no scales
pbm x
pgm x
nef x
crw x
cr2 x
arw x
mrw x
rw2 x
dng x
mpo x just main image is displayed
jps x
pns x
psd x
psb x
tga x

52 thoughts on “Features”

  1. HOW I GOT MY EX HUSBAND BACK WITH THE HELP OF REAL AND EFFECTIVE SPELL FROM DR Osasu My name is Olivia Jayden, I never thought I will smile again, My
    husband left me with two kids for one year, All effort to bring him back failed I thought I’m not going to see him again not until I met a lady called Jesse who told me about a spell caster called Dr. Osasu , She gave me his email address and mobile number and I contacted him and he assured me that within 48hours my husband will come back to me, In less than 48hours my husband came back started begging for forgiveness saying it is
    the devils work, so I’m still surprise till now about this miracle,i couldn’t conceive but as soon as the spell was cast,i became pregnant and gave birth to my third child,if you need any assistance from him you can contact him via:email: drosasu25@gmail.com Or WhatsApp or call him now: +2347064365391
    Dr.Osasu also cures:
    1. HIV / AIDS
    2. HERPES 1/2
    3. CANCER
    4. ALS (Lou Gehrig’s disease)
    5. Hepatitis B​

  2. I want to use this medium to thank Robinsonbuckler@ {{ hotmail. }} com because he brought back my Ex husband. my husband left me for his ex girlfriend he had before he married me it’s a difficult situation for me I called and beg him to come back he refused he said he don’t love me anymore I tried every possible way to get him back all was in vain I told my friend about it and she gave me Robinson buckler email and I emailed him and told him my problem and he told me what to do and I did it and he cast a love spell which brought back my husband within 24 hours.

  3. Hi, how do I make sure when deleting files they’re sent to Trash? Currently, it just permanently deletes them.

  4. Hi,
    I’ve just recently got Nomacs on board…………. I don’t know what the hell I’m doing most of the time I spend on a pc, but I’ve been able to use it thus far, to carry out the complex + involved applications I concern myself with, invoking no more than the usual amount of foul language + threats of violence, I’m reduced to when going about my business………
    So, all in all, I’m very pleased with your work + felt compelled to send you all some love + a big, wet, girlie kiss……… it was the least I could do, I thought……………
    BIG love,

    Si X (that’s that kiss I mentioned…….. it’s true value is as a mental image, I realise, now….. visually it’s very disappointing, isn’t it? I can only apologise for that being so……. mentally, though, that’s up to you…….. go wild!……. )

  5. I have – unsuccessfully – been trying to find a way to open nomacs using a default directory rather than the last used location.

    Tried various CLI options but no go – would a default directory option be possible please?

  6. Hi guys, great piece of software, though I have to admit I don’t understand the choice of some of the panels/floats/overlays around the main image area.

    Today I wanted to simply increase the contrast of a scanned image, but found no contrast slider anywhere. I was able to use the Exposure and Offset sliders (dragging them in opposite directions had a similar effect as increasing contrast), but it’s not quite as convenient as having a single slider (kinda advertised under Features above). If contrast is truly mathematically the same as sliding Exposure and Offset, may I suggest adding a Contrast slider that moves them simultaneously.

    Keep up the great work, and thanks again for my favourite image viewer!

  7. Hi,thanks for your greatapplication, I also love your cross-platform ability. I have a feature request, would you make non image files hidden in file explorer within nomacs

  8. First, thanks for creating nomacs, it is my viewer of choice on Linux.

    Just to confirm, nomacs is showing the embedded jpg from a raw (I have a Nikon, nef in my case), isn’t it? Can this be made somehow clear to the user? Any chance of displaying the raw with lens corrections applied. This is not easy task I presume.

    On Windows I use as well ACDSee – it has a button that toggles between showing the embedded jpg and proper decoding raw Alas, no support yet for Z 6 and its lenses. Can you do at least the same, have a button/menu to toggle between embedded and raw decode?

    Many thanks,


  9. Is there any way to shown only either raw or the jpg file of same filename? When browsing through my images, I often have CR2 and JPG files but for a first sighting, I’d rather only look at the JPG unless there is none.

  10. Hi! Great viewer, my default one now!

    Is there a feature, that when viewing images from a directory to show image count in a corner? Like image 12 of 123?


  11. Hi, can I move images from a directory to another and maybe create new directories? Can this feature be added or isn’t in the scope of the application?

  12. Any chance of supporting DDS files or game files anytime?
    I have a good viewer as it is for now. Should yours view more however I would change.

  13. Hi. great job Nomacs is an excellent software.
    my queation is it would be very nice if stars qualificatons were lightroom compatible. if you mark stars in nomacs could you see the same stars in lightromm?

  14. Hi,
    Is there support for sharing a picture 1 or more like via email from within the program (click on image and then either have an icon in the tool bar or menu entry to send via/by email ??

    1. if you have Thunderbird, you can add it to the Open With menu (File > Open With > Manage Applications). Nomacs then opens a new message with the currently displayed image attached.

    1. 1. Open the jpg file in nomacs.
      2. Click on Save As in the File menu.
      3. In the pop-up choose PNG as the save as type


  15. Hi, I am using a Mac OS X Mavericks and not so professional, so how can I get Nomacs running on a Mac. I have installed already MacPorts, but now I am searching to find the information how to get nomacs installed and running. Can you help

  16. Hi, does this program support lossless crop and rotation of JPEG images? Very few programs do and it’s really useful. Currently I use IrfanView for that purpose, but it would be nice if this one also had it.

  17. Hi,

    is it possible to overlay images and highlight the differences with another colour?
    I need this to compare tiff drawings.

  18. Hi Nomacs-Team,

    very nice work, i am just missing some things to be perfect and to switch completely to nomacs as number one viewer under linux:
    – copy and move to dialog
    – send various images to open with application (so i can write a python app for copying and moving by myself, see above)
    – right click “open in new tab” in the thumb panel, so i can easily compare images
    – rectangle zooming: select an rectangle with left mouse button and zoom to this selection then (so just another way to open overview mode)
    – find and filter just searches filenames, should be enhanced to the Notes, too.
    – command line options for the panels, menus, status bars, etc. to be shown at start up
    – define frame color and size of frameless view
    – rotating by any angle not just 90 *x
    – undo and redo icons in toolbar

    So thats all for the moment 🙂


    1. hi,

      thanks for the feedback… here are a few remarks:
      – rotating any angle can be either achieved with the crop tool or the transform plugin
      – undo/redo will be a new feature in 3.1
      – copy/move to can be either achieved with the batch tool or by drag&dropping from the thumbnail preview

      most other suggestions are pretty good and will be considered in the near future…

      1. Hello Everybody,

        Working with nomacs some days around now, and just some remarks on the image manipulations:
        – separate adjustments for red green blue etc. would be perfect
        – adjustments need a button (or right click, or double click) to set the value back to zero
        – inpainting plugin sounds great, looking forward to the gosc 2016!

        Makes fun using nomacs


  19. Hi – guter Ansatz, feine Arbeit. Ist es möglich über die CommandLineArgs Nomacs anzuweisen nur eine Instanz zu verwenden?

    danke und vg andi

    1. Thanks. It is possible to send an image to an external program via the File->”Open With” Function. Perhaps you have to add your application via the “Manage Applications” Dialog where you have to set the path for your program. Afterwards you can also assign a shortcut to a specific program using File -> “Keyboard Shortcuts”

  20. Hello. I love this program. <3
    But I use Ubuntu and, I think, many other users and, of course, I, would be very grateful and pleased if in the new versions appeared option "set wallpaper" for Ubuntu too, not just only for Windows.

    Sorry for my bad english and thank you for the great soft!

    1. Hi,
      thank you.
      It’s not easy to add this functionality for Linux so that it will work with all desktop managers. Thus we recommend using the set wallpaper function of the desktop manager.

  21. I really like this application. I searched a long time something like this with windows and linux support. Just one question is it possible to view Gimps xcf-Files?

    1. Hi,

      thanks for pointing this out. NRW is already supported. It is not added to the default extensions yet. You can add it File > Add Image Format – then drop an NRW file in the dialog. We will add it to the default extensions with the next release.
      if you want to set nomacs as default app for NRW files, you can open Edit > Settings > File Filters and then check the ‘register’ box there (after you have added the image extension).


Leave a Reply to Anonymous Cancel reply

Your email address will not be published.