Frequently Asked Questions

Arclab® Watermark Studio

F.A.Q. Index

comment  How to unlock the test version after purchase


Click on "Info & License", enter the license key and click on "Validate License".


The license key has the format:



How to unlock


Please take a look at this page if your license key is not working.

comment  How to create a transparent image watermark


We recommend to create a transparent PNG image (32bit) using a graphic editor like e.g. GIMP.
See: Create a transparent watermark for Watermark Studio using the free GIMP (GNU Image Manipulation Program)

comment  How to fix Microsoft .NET Framework error


Download and install Microsoft .NET Framework 4.5.2 (or newer)

comment  Can I use Watermark Studio on a Mac?


Watermark Studio is a software program for Windows PC, it will not work on Mac OS.
You can use it if you have a dual OS installation MacOS/Windows on your Mac.

comment  The program can not save the output images ...


Click on "Start Processing" and select the output folder to start the processing.
See also: Start Processing


Important: The output folder should not be the same as the source folder.
The program does not overwrite the source images, because the process is non reversible.

Important: The program rebuilds the folder structure in the output folder, if you have selected (multiple) images using the tree view!


The program shows a red X in the output log if it cannot save a file.
This can have the following reasons:


  • The source images and the output images have the same path.
    Solution: Use a different output folder, e.g. c:\output\ (The program does not overwrite the source image)

  • There is no free space left on your hard disk.
    Solution: Clean you drive or use a different drive.

  • The user has no permissions to write to the specified output folder.
    Solution: Run the program as administrator, use a different folder or change the folder permissions.

  • The output folder is synchronized with a cloud service, which locks the files temporary.
    Solution: Close your cloud software or stop the synchronization temporarily.

Not found an answer to your question?

Contact Arclab Support