Threshold j2k

Download and install the latest version of Filestar.
Right click on one or more J2k file(s) on your desktop and select Convert with Filestar.
Type threshold in the search box.
Press Run.

What is .j2k?

Name: JPEG 2000 Image
Extension: .j2k
Format: Binary
Category: Raster Image
Developer: Joint Photographic Experts Group
Description: Compressed bitmap image that uses wavelet compression instead of the DCT compression used by standard .JPEG images; supports 16-bit color, alpha transparency, and lossless compression.
MIME Type: image/jp2
Sample: sample.j2k
Wikipedia: .j2k on Wikipedia

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Last updated October 3, 2026