J2K File

What are J2K files and how to open them

Are you having problems opening a J2K file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your J2K files.

What is a J2K file?

A .J2K file is a JPEG 2000 Image file.

The .j2k file extension is a raster bitmap image file type that is used by Joint Photographic Experts Group (JPEG) 2000 files. The JPEG 2000 format uses wavelet-based image compression instead of the DCT (Discrete- Cosine- Transform) compression and stores metadata.

The metadata or the description information of the .j2k file is coded in XML as compared to the standard .jpeg or .jpg format that is basically formatted with EXIF data.

JPEG 2000 files are saved with a .j2k extension but typically, they can also use either a JP2 or JPX extension. For Windows, JPEG 2000 files can be open using the most popular image viewers and editors like the ones pioneered by Adobe and Corel. Though they are still not as common as standard JPG files, J2K files can support 16-bit color, alpha transparency, and lossless compression.

How to open J2K files

We have identified five J2K openers that are compatible with this specific type of J2K file.

Programs that open JPEG 2000 Image files

Last updated: July 31, 2023

Various apps that use files with this extension

These apps are known to open certain types of J2K files. Remember, different programs may use J2K files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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File.org helps thousands of users every day, and we would love to hear from you if you have additional information about J2K file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.