Stefan Fiel, Markus Diem and Florian Kleber
Computer Vision Lab
Vienna University of Technology


Fabian Hollaus (implemented the pseudo color function)
Petr Vanek (mac, openSUSE and Fedora ports)
Elbert Pol (OS2 port)

GSoC Students

Fedor Morzov (High Dynamic Range Imaging)
Tim Jerman (RAW Loader, Plugin System, ZIP Archives)

For feature requests and bug reports please use our bug tracking system

or write us an email:

82 thoughts on “Contact”

  1. Hello,

    Im tryid to replace 3.6.0 ver with 3.8.0. First I uninstall 3.6.0 and tried to install 3.8.0. When tried to run app keep telling me that VCOMP140.DLL is missing from my computer (Win 7 32b).
    Now I cannot install neither version, can you guys tell me what’s wrong? thanks.

    P.S. Love Nomacs, great software.

  2. sayın yetkili, merhaba. nomacs 3.8.0 9/11/2017 versiyonu yükledim.çalışmadı! işletim sistemim Windows 10 .

  3. Hi,
    – Is this software free for business (company) or not?
    – is it possible to change a theme (icons bigger and in colour, dark theme, …)?
    Thank you. Have a nice day.

    1. Hi,
      – nomacs is free for business too.
      – you can change the icon size in Edit > Settings > Display > Icon Size
      – the icon color can be adjusted in Edit > Settings > Icon Color
      – unfortunately, we do not have a dark theme yet (but you could change the stylesheet.css)


      1. Where can this stylesheet.css file be found?
        Can icons be in a separate folder, so I can change them?
        This software is the best free alternative to use. Thank you.

  4. Hello!
    Are there any exclusive advantages to using 64-Bit version of this App ? I have a 64-bit Win 10 OS but the PC configuration is not appropriate as per Standards!
    Can I install 32-Bit version of this App? Will there be any limitations to this approach?
    Inputs will be sincerely appreciated.
    Thank you, Regards from — New Delhi, India.

    1. Hi,

      using the 32-bit version has the typical limitation of 4GB RAM that can be used. Hence, if you want to load huge images or batch processing large images, the 32-bit version might be limiting. However, if you just want to view typically sized images (i.e. 12 megapixels) you might not experience any limitations…

  5. Sorry but crop command is function ? I press C then select and then ???? Enter or what ? I did not find hoe to crop.
    I use nomacs in Arch Linux.

  6. I tried many other image viewers for Linux (eog, xviewer, gthumb, Pix, PhotoQT, Ristretto, Mirage, etc. etc.) but yours is clearly the best – by far!! Congratulations for this outstanding achievement!

    I would have three small feature requests though based on version 3.6, in order to fix the only shortcomings which I could find compared to other image viewers:
    (1) A hot-key to “zoom to width” (especially for full screen view)
    (2) A hot-key for finer zooming control (e.g. fine zoom adjustments with e.g. CTRL+mouse wheel )
    (3) A crop selection rectangle which stops at the image edge (in order to quickly change the aspect ratio of photos to avoid fiddling on the edges not to loose pixels).

    Again, absolutely outstanding job, especially including the coding quality (not a single crash since I am using nomacs)! Wouw!

    1. Hi,

      (1) totally makes sense
      (2) I think a zoom table (as suggested by other users) would do the trick here (switching between fine & rough zooms). btw. you can already adjust the zoom to an exact level using the overview HUD
      (3) cropping snaps to the edges only with the first mouse move


  7. Hi! I’m looking for a viewer that I can start from command line, it overlays fullscreen over the mediaplayerclassic (playing in fullscreen) to show an image for some seconds, then close itself.
    It would be great to have some soft transparency/fade start, and soft close back to the video. I need it to advertise some events.
    Is it possibile to do it with Nomacs?
    Thank you

    1. Hi,

      this is possible: create a fully transparent image & open it in frameless & overlay mode with nomacs. then set the slideshow timer such that your image (which is placed in the same folder as the transparent image) appears at the correct time. setting the fade effect in the slideshow settings (preferences) should do the rest.


  8. Hi, can’t find any information about ICC color profiles, in files and of monitor/OS, and its support by your software. Sadly. Please, inform is your software/viewer fully color managed ?

  9. I’m so happy I found this program. It’s nearly PERFECT! Intuitive, does basically everything. Thank you so much for making it!

  10. Hey guys, do we have chances to have nomacs on Microsoft Store for Desktop? I have seen that UWP apps. They runs much better than win32 api.

  11. Any chance we’re ever gonna see good ol’ Windows Photo Viewer’s feature of snapping the edge of the pic to the edge of the monitor instead of dragging it all over the place in full zoom? That’s the only thing that irritates me when I open multiple images.

  12. How did I finally discover nomacs for the first time after about 15 years of using Linux? 🙂 It’s really a great little piece of software, does exactly what it’s supposed to, lightweight, and no frills. Very well done guys!

  13. I dont often make the effort to say thank-you, but nomacs is an exception.
    I’ve been looking for a fast and simple tool on Linux for ages, and nomacs does exactly what I want.
    crop, rotate, resize, rename.
    For me, simple is best. I just want to minimize the size of photos I take before sending to websites or on e-mails.
    Great work guys.

  14. Nomacs is a poor cousin of FastStone Image Viewer. Notice nomacs has no auto hide on the thumbnail preview or file transfer options like Fast Stone. FastStone Image Viewer is free and smaller portable size.


    1. Hi,
      this is the display of the crop region stored in the metadata of the image. You can turn this off in the settings -> display


  15. Hi,

    i am trying to deploy nomacs 3.4 to some of our clients. Unattended installation is fine but i did not get it how to add plugin installation to the js-script/install-script so the plugins will be installed together with nomacs.

    I tried to disable the “update questions” within the program for all users because if they havent admin rights its not useful to display an update possibility because they cant update. I found this setting in the registry under HKU but is there a way to put it into HKLM or to preconfigure it within the program folder? Otherwise i had to preconfigure the user profile and i dont want to do that 🙂



    1. Hi Sascha,

      In order to install plugins, you have to add this line in ComponentSelectionPageCallback:

      do not forget to add the page (line 22):
      installer.setDefaultPageVisible(QInstaller.ComponentSelection, true); // true instead of false

      hope this helps you…

      Considering the the update:
      you could copy the following lines to a text file and save it as nomacs-no-update.reg

      Windows Registry Editor Version 5.00

      [HKEY_CURRENT_USER\SOFTWARE\nomacs\Image Lounge\SynchronizeSettings]

      running this file after the installation will disable updates on the client machine…

    2. Don’t waste your time, ACDSEE classic portable is only 666.kb And I have used it since y2k and it is faster to deploy than nomacs plus it has superior file transfer tools. If Jpegview had the thumbnail view options and thumbnail strip I would use Jpegview over nomacs bloatware

  16. Hi Marcus ,Nomac is a very great application and I love it.Is it possible to add the DELETE COMMAND on the edit menu below the menu bar? is it possible to make the edit menu menu show above or below the image?

  17. Hey there, I do not understand much about Windows 10 software, but is it possible to easily change your program in a way that one can install it without admin rights? After all, it works for Google Chrome.

    Thanks for the good work though!

  18. I was looking for a recent, simple to use image viewer. This one is amazing 😀
    – Open source,
    – Lightweight,
    – read RAW,
    – read GIF,
    (you can zoom in and out, stop, play, go to next and previous frame, really good for 2D game animations)
    – image manipulations

    It lacks:
    – read multiple images as an animation (would be nice for 2D game animations)
    – the batch processing does not allow a lot of manipulations (resize, rotate, convert that is all I think)
    – undo/redo

    I am very excited to see how it will develop and to see it becoming get better and better 😀
    Good luck!

  19. Hi) I’ve tried to use it, but it said “This application failed to start because it could not find or load the Qt platform plugin “xcb”.

    Reinstalling the application may fix this problem.”

    Install was fine, but the starting was not.

    What I can do with that?

    P.S.: I use Linux Mint 17.3 Mate x64

    1. Hi.
      sorry for the late reply, but we overlooked your comment. I just tried out running nomacs (version 3.2.0) on a fresh installation of linux mint and everything runs fine. Since I had to change the packages for this update, I think this issue is fixed


  20. I just came across nomacs, looks good and I am exploring it further. I am a minor contributor to the exiv2 project, mostly I have added support for additional XMP schema’s such as DwC and LR.

    Saludos desde Peru!

  21. Hi, I made over Qt Linguist translation Turkish and will continue to do, but about 10%. He could not accept the language file language of substitution. I translated the language file does not open?

  22. Your Image Lounge installer is so stupid, it blocks after it has downloaded about 20 % of the archive. I tried it about 5-6 times, on a 2-3 days time lapse. So Good Bye Image Lounge. Gizmo Freeware may consider it as one of the best 64 bit free programs, it doesn’t worth a try with a disable installer/downloader. I will stay with Zoner. At Least, it is possible to download it completely and silently with Free Download Manager. FDM can handle connexion problem on is own way and restart download when connexion fails. Efficient download and efficient install are important, even with free products.

    Clément Marcotte
    Amos (Quebec) Canada

    Congratulations to your great open source software. I’m willing to donate some money. However, I don’t trust Paypal services, in particular in the light of the European Court’s decision on security of data. Is it possible to get your account data (account holder, IBAN, SWIFT-BIC) and a keyword (like “donation” or something like that) for easy direct money transfer without the need of giving my data to any 3rd party outside European Union? Thank you.

  24. Hello,

    I am looking for the themes/skins. There’s no problem with the defaut theme on nomacs, but I think in the possibilitie to changing the main theme for another… For example, changing the main theme to the Tango (, It’s an cool way to make the program looks like the user preferences.

    If possible, will appreciate much more this program.

    Thank’s and sorry my bad english

  25. Hi, I’m trying to use nomacs to read comic, turned out it can’t replace my image viewer yet.

    1. Can you make so the arrows are only used for navigating an image?

    2. Can you add the status bar property: current image/total image? (example: 4/22 means current image is number 4 of total 22 images) and current zoom level would be nice.

    3. Can you add faster/bigger zoom level? For now it’s 66%, 72%, 80%, 88%; it’s I need to zoom 4 times in order to reach the size I want.

    Would be great if you can add those requests, thanks 🙂

  26. Hi guys

    I’ve just downloded nomacs image lounge, i’m very curious because this little software seems to me a very good alternative to other most famous application. I give it a try and then i send you my opinion.
    For now thx for your work and have a nice week-end.


  27. Hi,
    das Programm gefällt mir sehr gut, auch das es als portable Version erhältlich ist.
    Einen Punkt würde ich mir aber noch wünschen.
    Das man beim Zuschneidewerkzeug die Breite und Höhe in px eingeben kann und dann in dieser Größe das Bild zurechtschneidet.

  28. Hi, really like your application, it is a great replacement for the Standard Windows Photo viewer (shudder)

    Just a quick question I may be missing a trick but is there a way to bypass the print preview screen when printing images?

    Thanks again for the great tool.

    1. Hi,
      thanks you

      currently there is no possibility to bypass the print preview dialog. The idea is good but the problem is that imho every user will except a different behavior for printing (especially concerning the dpi of the image (some images don’t have this information stored in the meta data and we have to guess), landscape/portrait mode a.s.o). If you have a suggestion how to satisfy everyone we will think about implementing this option.


  29. I’ve been impressed with this little program so far.
    One thing I’ve been looking for in an image viewer but only xnview has it, is the use of tabs, but even there is lacking in functionality.
    I would love to see a more robust use of tabs in an image viewer, like the tab system in firefox or chrome, and be able to save the session with all the tabs, even with multiple instances.
    You guys ever considered that option?
    in any case keep up the good work!

  30. Re: Feature 377

    I am the one who posted this. I would have replied sooner but I have been without internet access. Marcus asked me how I knew that nomacs used 2×2 subsampling.

    That’s easy. I saved a JPEG in nomacs then opened it in IrfanView and looked under Image Info.

    It is really unfortunate that it is not straightforward to implement. I used to use FastStone Image Viewer for cropping, resizing and saving the final JPEGs.

    Your area resizing option is much better on my test patterns than the best of FS’s which is Lanczos 3. The Lanczos algorithm has ringing problems. So now I use nomacs for cropping and resizing and save the results as a PNG which I open is FS to save as a JPEG with no subsampling.

    I was hoping to be able to eliminate FS Viewer, but I guess that won’t be happening.

    Any how, thanks for a great program.

    Bob Curran

        1. I just saw that version 3.0 is the target to implement my suggestion to include jpeg subsampling options.

          Thanks for accepting my suggestion. Any idea when 3.0 might be coming out?

  31. Hi`

    i`m new using this nomacs and i like it. It small, light and portable.
    I like that nomacs support frameless option to.
    Few requests about it, could you add options to allow picture to always stay on top? and options to allow image to view in certain fix ratio/size?
    when i use 2 or 3 frameless i want to place it in side/bottom screen/specific place, and i want it to always stay on top and can be display in specific/small ratio not always in original size, so when i check/compare my images i still can do other things to.
    sorry for my bad english.
    Keep up the great works


    1. Hi zen,

      thanks for your request. the ‘always on top’ option is currently not implemented. but you can keep size/ratio. therefore you have to open preferences (CTRL+SHIFT P), navigate there to Display (you might need to check Advanced at the bottom right). in the Zoom Group you have three options for scale behavior when switching between images. if you choose ‘always keep zoom’ the images will keep their size…

      regards markus

  32. Hi
    Forgive my poor English.
    I have a question:
    In spite of the fact that I have the option uncheck still me one appears ”Menu” a few seconds again when I initiate Nomacs (Panels->Toolbars->Menu). I do not like this delay in hiding itself. I would like that it was something instantaneous. Might it do something in order that the Menu was not late a few seconds of more in hiding itself?

  33. Brillant.
    I like this viewer a lot.
    It offers good features and easy usability.
    But you really should be solving the bug about not ordering files.
    It just doesn’t order by filename, it seems random most of the time.

      1. hi,
        we are working on it. it is not included in 2.0.2 … in the current developer branch the sorting is better but still has problems with special naming. Hopefully in the next version we have a solution which satisfies all our/your needs.


  34. This project looks excellent, really nice way to display images.

    One request:
    I would like a ‘double click’ to open a directory rather than rename it.

    1. hi,

      are you talking about the File Explorer panel? If so, you can right click in the panel and uncheck ‘Editable’. Folders are then opened on double click rather than renamed.


  35. Hi guys,
    I am very very impressed with your Nomacs viewer. It is now my favorite and preferred viewer… so much so that I want to uninstalled Windows viewer, but it seems that since I’m using the portable version, I could not find a way to make it the default viewer.
    You have everything else… did I miss it ?

    I am a corporate consultant, and therefore I’m picky about organization. Your viewer is full of features that are just perfect for me. I like using the scroll wheel to change pictures without having to click on anything like other viewer do… or to dig into the system looking for the folder to open images… blah.
    Yours is just right. Now, if only folks got to experience what you have, and if they were to find it useful like I do, then this could go in useful directions for you.

    Thanks for being smarter than Microsoft.


    1. Hi Richard,

      sorry for the late reply… Setting nomacs as default viewer does not directly work on Windows 8. If you register the extensions (Edit > Settings > File Filters) Windows will post a message that you have new apps which can handle the file opened from the explorer – there you can chose nomacs. This happens because Microsoft turned off the possibility for apps to register themselves (which is good from a user’s point of view).

      regards, markus

  36. Hi are you aware that Norton AV deletes your programme as a threat if it is downloaded on a machine with Norton installed?

    1. no, we weren’t aware of that. Thank you very much for reporting. We contacted Norton and hopefully they will put nomacs on the whitelist.

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