Questions and Answers

What does nomacs mean?
First, when we started with the RAW support, the MacBeth color charts mostly did not have the colors expected when we loaded the images in nomacs. Second, we solely supported Windows and Ubuntu in the beginning. At this point we want to thank all the supporters who translate nomacs or build it on other OS.

Is it possible to put the thumbnails vertically at the left edge of the screen?
Yes, you can right click on the thumbnails panel and then choose e.g. ‘Show Left’. You can even undock the thumbnails if you do not like the nice overlay effect.

Is it possible to stop movies such as GIF or MNG?
Yes, you can hit pause in the toolbar player or by selecting View > Stop Movie. If you then save the image, the currently displayed frame will be written.

What is the synchronization all about?
We are involved in image processing. Hence, we often need to compare the same image after different processing stages. So we wanted something that does this job faster and easier than Photoshop. That was the initial motivation behind nomacs.

How can I support nomacs?
Your support is always appreciated. You can either support us by:

  • translating nomacs to your language
  • porting nomacs to a system not yet supported (it should compile on every system that is supported by Qt)
  • coding (bug fixes & additional features are always welcome)
  • and last but not least you can donate

How to translate nomacs?
Here is a short introduction how to translate nomacs to your language.

Does nomacs support Windows XP and/or Vista?
The answer is yes and no. So neither Windows XP nor Vista are supported in future developments since nomacs 3.0. However, nomacs 2.4.6 is a pretty stable version which you can use on these operating systems.

How to make an unattended installation of nomacs?
When using Windows you can make an unattended installation of nomacs. Take a look at this post for more details.

Why is the 64-bit version installed into Program Files (x86)?
The thing is, that we need to install both, the 64 and the 32-bit versions into the same directory for easy maintenance. Since Program Files (x86) exists on every Windows OS we chose this directory by default. However, you can choose Program Files during installation if you like your apps sorted with respect to their bitness.

87 thoughts on “Questions and Answers”

  1. Hi, absolutely love nomacs!

    One thing I am finding a little tricky and couldn’t find a solution for was exact cropping size. If I want to crop a picture to a size (say 400×600), there doesn’t seem to be an easy way to do it, only dragging selection box back and forth to match pixels exactly.

    Anyone know the best way to deal with this? I was hoping to just type a size in boxes where the aspect ratio currently is, but it doesn’t seem possible.

  2. This app pretty supports everything I use in my workflow, especially BC3+ compression of DDS which I have had a hard time finding in this program category. However it doesn’t seem to open TGA despite that qtga.dll seems to suggest it should. Whats up with that?

    1. nomacs supports TGA but it is pretty picky – it requires the footer to be correct (contain TRUEVISION-XFILE). Hence, TGA files saved with Photoshop will be loaded.

  3. hello how do i set the thumbnail icons on windows file viewer to the actual pictures instead of the nomacs logo? it only shows the glass instead of the pics

  4. Hello, everyone
    When I edit images, nomacs add Image>Software [nomacs – Image Lounge] default, but I usualy post images as an anonyous, however the comment may be found with tracing who post it.
    At previous version, it have a hunch to turn off.
    Would please teach it’s right, or how to do them.
    Best regards, Horensor

  5. Hi. I jumped around between frameless and normal view; full screen and normal; and at the same time closing and opening software. Now I can’t open nomacs. I start it, icon appears on tray and… nothing. can’t see program window. (win 8.1, x64) re-install didn’t helped.

    Can you say me where nomacs keeps it’s config files? I want to reset my configs to default.

    1. Hi,
      the nomacs configs are in the registry:
      Win Key + R -> regedit
      HKEY_CURRENT_USER\SOFTWARE\nomacs\Image Lounge
      there you can try setting AppSettings > appMode to 0x00000000

      another way to reset the nomacs is to open a CMD in the directory that contains nomacs.exe
      (default: “c:\Program Files\nomacs\nomacs-x64\nomacs.exe”)
      then type: nomacs.exe -m default


    1. Hi,
      this is basically a wrong default setting (and fixed for the upcoming release). For now you can go to Edit > Settings > Display. Then uncheck ‘Show crop rectangle’


  6. Is there an option to resize the window to the image size? I’d also prefer to be able to make this a default so that any time I open an image it will try to open the window with the same size (unless it’s bigger than maximized in which case it should be maximized and the image should resize to fit the window).

      1. Very useful. There does appear to be a slight issue with this method but I’ve found a workaround that isn’t too difficult (and that can be auto-hotkey’d).

        If you open the image and the window is smaller than the resolution of the image then pressing CTRL + 2 does not change the size of the window (it flashes and displays a % in bottom-left corner). However, if you press CTRL + 1 first (Show 100%) and then press CTRL + 2 it does what I’m looking for which is to adjust the window to the size of the 100% zoomed image.

  7. Hi! I’m using the latest version of Nomacs on Win7 and I can’t get it to set as the default image viewer. Am I missing a step? thnx!

  8. Hello, thank you for this program, it is really good!
    I have a question – is there some option that turn on names of file near thumbnails?
    Or how I can make File info panel bigger? font size is too small.
    Thank you for answer!

  9. I picked this up because I hate the Windows 10 image viewing program. I love it in general, but there is one huge issue – when you cycle through images, it is always in alphabetical order. So if I have a directory sorted by date I can’t go through the images in that order. It really needs to cycle through images in whatever order the directory has them sorted :/ I deal with big directories of images that I sometimes need to sort other ways.

  10. I have been using your software for quite a few months now and it has been a very useful tool for me. Unfortunately, when I recently updated to the latest version, the program stopped working. It returns a bad image error for MSVCP140.dll. I am using the x86 version, installed with the setup program, on 32-bit Windows 7. Reinstalling the software did nothing, neither did reinstalling the Microsoft Visual C++ 2015 redistributable.
    Is this a problem on my end?

    Another question I have is how to download and install earlier versions of nomacs. I tried downloading and extracting from the “click here for older versions” link, but only received the following error message on startup:
    “The version of this file is not compatible with the version of Windows
    you’re running. Check your computer’s system information to see whether
    you need an x86 (32-bit) or x64 (64-bit) version of the program, and then
    contact the software publisher.”
    If this stems from the software being 64-bit, is there a way to download older versions for 32-bit systems, other than building from source?

    1. Hi Jack,

      we had a problem when we packed the x86 version. The updated installer is working in my Win7 VM.
      If you want an old x86 version of nomacs, you have to go for the 2.4.6 WinXP build. We dropped all other portable x86 versions since it is a lot of additional work for us and x86 platforms are rare nowadays.
      Sorry for the inconveniences!


  11. Very good software and I’m looking forward to is development!

    By the way is, there any setting to reset position of image when browsing through images that is bigger than windows? As it is I have to manually drag my image to the top because Nomacs remember the position from previous image. And the way you can drag image until its edge reach the windows’ centre is kind of weird… (just that image viewers I used before never do it)

    The setting might already available but I just can’t find it. If that the case, sorry for bringing it up! πŸ™‚

    1. Hi,
      In preferences display you can select how the zoom level in nomacs react when switching images. You can either select that it should keep the zoom level (perhaps you have actived it) or it should fit the window size. I hope this solves the problem you are describing, if the image is not centered then its probably a bug (we never experienced πŸ™‚ )

  12. Is there a way to sort pictures by EXIF Metadata infos ? like Image > Date Time or Photo > Date Time Digitized and Date Time Original
    I had this option in ACDSee and it’s really useful when you shoot pictures with different cameras generating pictures with different naming format.

    Also, the batch processing does not allow to automatically rotate the pictures according to EXIF info. It would be nice so that the picture can be visualized with the right orientation with viewers that does not use EXIF info to rotate it, like Win7’s default photo viewer.


    1. I want to piggyback on this comment. I am basically trying to save my pics so that they are oriented correctly in windows with the EXIF Metadata. Hitting save for each image is a pain. Am I missing something?

  13. Hi. Great image viewer, but is there a way to default the frameless view option to just one monitor. I have multiple monitor setup and when I open a picture in frameless mode it stretches through all my monitors and pictures look weird then.

  14. I installed your Dec’2015 v3 on Windows XP 32bit.
    It will now run…says not a 32 bit application???
    I could need v3 to run on XP 32bit.
    Please HELP.

    January 4, 2016

    1. hi,

      nomacs interpolates borders until it reaches 200% zoom, then the pixels are visualized. If you don’t like this behavior you can change it in Edit > Settings > Display > Stop interpolating at – set this value to e.g. 100% and nomacs will not interpolate anymore…

  15. Am I missing something or is there not an “Undo/Redo” feature? Otherwise…great stuff, thanks!
    …not usable without undo though πŸ™

  16. This is by far the most beautiful piece of software I have seen in many year and I really cant complain about anything your team is doing, but I was wondering if you think it would be possible to add Webm support as some people have started using it as a replacement for Gif files.

  17. I posted this at the contact section before, I posted at the wrong place πŸ™


    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 πŸ™‚

  18. Hi,
    great prog, just deinstalled eog on
    Ubuntu 14.04. A “defocused framless-mode”
    ( no player ) would be nice. Some eye candy
    on desktop won’t hurt πŸ˜‰

    1. Hi,
      thanks … what do you mean with a “defocused frameless-mode” ? (player can be hided using the panels menu)


      1. Well, e.g. clicking on an animated GIF ( transparent background ) and placing it on the desktop works like a charm. Only thing is that nomacs doesn’t loose the focus. So the whole desktop is “occupied”. By clicking somewhere it either starts dragging the image or opens the player in fullscreen window. If there would be an option in the context menu to stop that behavior, let’s say “sticky”, then nomacs could show animated images like screenlets in a comfortable way. Multiple instances seem to be no problem, so imho this could be a nice additional feature.

        1. In general, the frameless mode receives mouse events only at locations where the image’s alpha value is > 0 (I know there are issues with some linux window managers which we cannot fix).
          If this is not working for you, you could lock nomacs: View > Lock Window. After you do so, nomacs is transparent to all mouse events (This feature is intended for watermarks if you e.g. record a screen video).


  19. Love your software! Only I have a few issues:

    I would like to view ico files like how they are done in Windows Photo Viewer, instead of the default zooming feature (i.e. the ico file may have different images for each resolution). Also, setting nomacs to the default viewer of ico files has the undesired effect of replacing the (custom) ico thumbnail with the generic nomacs thumbnail (at the detail view)..

    Speaking of which, can there be different nomacs ico thumbnails specific for each image type?

    Also, how do I disable previewing of images in the zip archive when I browse its parent directory?

    1. hi,

      currently nomacs displays only the largest sub-image of an ico file. the ‘default viewer’ for ico files is windows behavior (we would not do this). I think it’s best to open Edit > Settings > File Filters and check ‘browse’ and uncheck ‘register’ for ico files.
      different icons for image types is planned for nomacs 3.0 – so you have to wait a bit sorry.
      @zip archives: Edit > Settings > File Filters uncheck ‘browse’


  20. How can i set nomacs to be default viewer in windows 7? i can see file association but if i click on picture in windows explrer or similar… file opens in my editor which is Zoner, i want nomacs as a viewer to be default. and one more thing, is it possible to be opened in full screen mode if i open picture bu clicking in windows explorer?

    1. hi,

      you can right-click an image file in image explorer -> Open With and choose nomacs there. remember to check the ”Remember my Choice”. Another option is to open nomacs Edit > Settings > File Filters and check the register checkboxes there.


  21. Well, this is a really nice viewer! More robust batch conversion (see Irfan view πŸ˜€ ) would be a nice addition πŸ™‚

    1. hi emi,

      thanks for the comment. We just worked on the batch processing which get’s a few new features for the next stable release… Is it crashing on your system?

      – markus

      1. No, works fine, i meant more features, but looks like you have that covered. Another great feature would be to force one instance only, that way when opening images from file explorer they’re loaded in already open Nomacs.

  22. Using Nomacs 2.2 on Debian Linux. Using Photoshop with Wine. Needs to use “Open with” option to open image files directly in Photoshop. It works fine with native Linux editors, but for running-with-Wine app it gives “Sorry, I could not start: “/patch to .exe file”
    Need solution.

    1. hi
      I’m not entirely sure if it is working, but the easiest way would be to write a simple bash script which opens photoshop in wine. Just create a file somewhere with the content
      wine [pathtophotoshop.exe] $1

      mark it as executeable and add it to the “open with” dialog. I’m not able to test this, but i think it should work

      1. Thanks, but it works only partially. Starts Photoshop ok with script file in “Open with” menu, but don’t opens selected image.

        1. Hi,

          after searching i found out that one need to change the path to the file for wine. Since i do not use wine I’m not entirely sure how to change it, but i’m sure you will find a small bash script in the internet which does this conversion.


  23. If I start Nomacs by clicking on an arbitary file in windows explorer, to see other files in that directory I click next next … at some point I “reach the end” and to see undisplayed files in that directory I have to click previous a scrillion times. Is it possible to wrap from last files to next file.

    Rgds George

    1. hi george,

      you can change this behavior in settings: Edit > Settings > (Advanced) File Info > check “Loop Images”. Moreover, you can always jump to the first/last image of a folder using the Home/End keys.


  24. Hi, nice work!

    I have folders with pictures in different orientations and when I flip through them, I always have to reset the display size to 100% and select ‘fit window’ if the image format changes from landscape to portrait (or vice versa).

    It would be nice to have an option to set the display size to a fixed value (like 100%) and always fit the window dynamically when displaying a new image.

    Regards, stephan

    1. hi stephan,

      if you want nomacs to keep the zoom level, you can set this in Edit > Settings > (Check Advanced) > Display. There you have three options:
      – Always keep zoom (that’s probably what you want)
      – Keep zoom if equal size
      – Never keep zoom
      Fitting the window (CTRL+2) automatically is currently not supported. Maybe, the frameless view would be an option for you? (View > Frameless (F10)).


      1. Thanks for the hints. It’s much better now.

        I’ve added a feature request regarding the function of the F11-key.

  25. Very promising piece of software you got there. This might replace Picasa for me. Trying it under Windows and Ubuntu at the moment and would like to see it remember the screen layout (toolbar/palette visibility) and open in the folder location it was last run with.
    Also helpful would be the ability to import Picasa’s ‘star’ ratings and image crop settings.


    1. hi thomas,

      thanks for the reply. nomacs does remember toolbar visibility/position and other elements such as the thumbnail preview, window position etc. (if this does not apply for your setup, you could write a bug report)
      the import of picasa settings will not be supported within the next releases since picasa saves star rating etc. to text files in your user folder (e.g. C:\Users\\AppData\Local\Google\Picasa2\db3\starlist.txt) instead of writing them to the image metadata.


  26. When Using version 1.6.4 on Xubuntu 14.04 there are a few issues. If I am in frameless there is a semi-transparent border around the photo. Can this be removed? Also when in frameless, with the image set to fit the window, it looks like a fully transparent border takes up the whole screen. If I have the image open in a file manager and see another image thumbnail beside it, or something else I should be able to click on, I cannot click on it unless I manually switch to the file manager. Is there some way to limit the transparent window to the size of the image, so I can click on something in the area outside of the image? Is there a way to add “close image” to the right-click menu of a frameless image?

    Thanks for all of your hard work. You have made an excellent image viewer, I am just trying to get the experience closer to the one a user had using Irfanview on their Windows system.

    1. Hi,
      you can disable the border in the frameless mode in the settings. Display -> Show Border
      The frameless mode should allow clicking outside the image, so this is a bug. Adding close image to the right click menu in frameless mode is a good idea.

    1. Hi Francesco,
      Thanks for your comment. Unfortunately, you cannot filter images with respect to exif data yet (there are still Performance issues)


  27. I really love nomacs. But the smoothing algorithm it uses for image viewing still leaves a lot to be desired. Could you let it use lanczos or bicubic etc. ?

    1. hi john,
      nomacs uses by default bi-linear rendering. Does the image change if you toggle View > Anti-Aliasing on? In that case a pixel area relation algorithm is applied which – in my point of view – is better than lanczos or bicubic (it’s the Area option in the resize dialog).

  28. Hi,

    is there a way to migrate from picasa to nomac without the loss of the person identification and Albums ?

    Best regards.

    1. Hi Richard,

      unfortunately, you can neither import the albums nor the person identification. both functionalities are not planned for future releases as nomacs is designed as image viewer (without a database etc).

      regards markus

  29. hi,
    you can specify the image path in the first argument. so the command in the windows cmd would be something like:
    >> “C:\Program Files (x86)\nomacs\nomacs.exe” D:\img\an_img.png
    and in a linux console:
    >> nomacs ~/img/an_img.png

    regards markus

  30. Is it possible to execute nomacs from the command prompt along with an image file and have it loaded with nomacs? I am trying to use it with a libreoffice base macro to view picture files from a database.

  31. hi felix,

    if you are running windows, nomacs cannot remember window positions if they are snapped or maximized since this is some hybrid window state (note that microsoft software such as the windows explorer does not remember this state either). However, you could resize the window such that it fits your screen (without maximizing) or you could quit nomacs in the fullscreen mode (CTRL+L or F11) which is also remembered.

  32. How can I made nomacs remember window size next time I open it ? I would like to start it maximized but always starts with a small window.

  33. hi,

    thanks for your comment. here is a short guide how to translate nomacs: (I will add it to the Q&A)
    you can associate file extensions during installation. adding the extensions later is not supported yet. so you have set nomacs as ‘default program’ using windows. (or you could run the installer again – this won’t affect your customized settings)


  34. Hi, your software is not fully translated to Protuguese-PT. How can I do the rest?
    Also, is there a wya to use it as Windows default viewer?

  35. which os are you using? webP is currently only supported on windows (we plan to support it on linux in the next release)

  36. On the features page of your website, it says that nomacs can read+write webp format. After installing i realized that it can neither save nor open webp images. Please fix this or i’ll laugh at you, a lot. -John

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