All about J2K Files

The J2K file type is primarily associated with Photoshop.

J2K	File extension: J2K
	File type:	image

What is a J2K file?

J2K files mostly belong to Photoshop by Adobe. J2K filename extension is used by image files encoded with JPEG 2000 file format and image compression standard. The contents of a typical J2K file includes graphics data, 16-bit color information, and alpha channels in the image. A J2K file can also contain high dynamic range image information with up to 38 bits per component. Programs such as XnView , QuickTime, Photoshop, and PaintShop may be used to view images saved in J2K files. JPEG 2000 has a scalable codestream that can be decoded in multiple ways. The scalability of J2K files and their ability to store more data than standard JPEG images make them suitable for photo editing.

How to open a J2K file

You need a suitable software like Photoshop to open a J2K file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your J2K file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a J2K file directly in the browser:. Just drag the file onto this browser window and drop it.

Online J2K File Viewer

Choose your .j2k file to view

or drag and drop it here

Online File Viewer

✈

Read our privacy guarantee in Filext’s terms and privacy policy

Please allow ads on our site

This helps us keep our servers running. Then re-upload your file to view it.

Click here to see how to disable the ad blocker for filext.com

How to convert a J2K file to JPG, PNG, SVG, PDF, ...

1. To do so, click the "Choose your .j2k file to view" button above.
2. Your J2K file will then be displayed in the browser.
3. Now click on "Save as..." at the top of the page.
4. Then choose the image format (e.g. JPG, PNG, TIFF, PDF, ...) you want.
5. Download the converted file.

J2K file format:

Every file has a defined file format, i.e. how the data is arranged in the file. The file format can be deduced from the file extension and the signature. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. When there is a problem with a file, the first step to solving it is to determine the file format. Our evaluation of the J2K files looks like this:

J2K is seldom used as a file extension and is primarily used by a single program. The file formats most commonly found in J2K files are:

• 75% of all J2K files belong to JPEG-2000 Code Stream bitmap. These files are binary files, so they do not contain text, but only cryptic characters. The files are often between 7 KB and 7 MB in size. The file type was developed only in the last few years. Certain words are almost always found in the files, such as @@HHPHHPHHPHHPHHP and Created. Files like these are about image.
• 25% of all J2K files start with the bytes 00 00 00 0C 6A 50 20 20 0D 0A 87 0A, which are crucial for this file format. The contents of these files cannot be read by a human; only a computer program can interpret the data. Most of these files are 360 KB to 1 MB in size. The files contain the following words: colr, ftypjp2, ihdr, Gjp2h, res, Huuidap, uuid-A! and resc.

You can get all the details of your J2K file by dragging it onto this page or by clicking the button "Choose your .j2k file to view" above.