Add file extension

File extension J2K

The most common cause of problems with opening the J2K file is simply the lack of appropriate applications installed on your computer. In this case, it is sufficient to find, download and install an application that supports the J2K file format - this type of programs are available below.

File type JPEG2000 Code Stream Image
Developer Joint Photographic Experts Group



It should be noted that some coded data from files that your computer does not read can be sometimes previewed in a Notepad. This way, we will read passages of a text or numbers. It is worth checking if this method can also be applied to the J2K files.

What should be done when an application from the list has already been installed?

Often, an installed application should automatically link to a J2K file. If it did not happen, the J2K file can be linked with the newly installed application manually. Simply right-click on the J2K file, then from the available list select "Choose default program". Next, select "Browse" and find the application you selected. These changes have to be confirmed by pressing the "OK" button.

Programs that can open the J2K file

  • IvanViewIvanView
  • CorelDRAWCorelDRAW
  • PaintShop ProPaintShop Pro
  • Adobe PhotoshopAdobe Photoshop
  • QuickTime PlayerQuickTime Player
  • Nero Multimedia SuiteNero Multimedia Suite
  • XnViewXnView
  • FastPictureViewer ProfessionalFastPictureViewer Professional
Mac OS
  • GraphicConverterGraphicConverter
  • Adobe PhotoshopAdobe Photoshop
  • QuickTime PlayerQuickTime Player

Why can’t I open the J2K file?

However, problems with the J2K files can also have a different background. Sometimes even the software, installed on your computer, that supports the J2K files does not solve the problem. The reason for the fact that the J2K file can’t be opened and used can also be:

- an incorrect link to the J2K file in the registry entries
- corruption of a J2K file, that you want to open
- infection of a J2K file (viruses)
- insufficient computer hardware resources
- drivers out of date
- accidental deletion of the J2K file from the Windows registry
- incomplete installation of the program that supports a J2K file?

Solving these problems should allow the free opening and working with the J2K files. If the computer still has problems with the files, use the services of an expert who will diagnose a specific cause.

My computer does not show file extensions, what should I do?

In the standard Windows settings, a computer user cannot see the J2K file extension. However, you can successfully change this in the settings. Just go to "Control Panel" and select "Appearance and Personalization". Then, go to the "Folder Options" and open the "View" tab. On the "View" tab, you will find "Hide extensions for known file types" – you should mark this option and confirm by pressing "OK". At this point, the extension of all files, including the J2K files should be displayed after the file name.