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ImageJ is a public domain Java image-viewing and -processing program. It runs either as an online applet or as a downloadable application, on any computer with a Java 1.6 or later virtual machine, and can provide image analytics and basic editing functions.

What's New

Version 1.49d:
  • Horizontal error bars can now be added to plots.
  • Non-uniform x and y units are now used in image subtitles and by the Show Info, Specify, Rotate Right, Rotate Left and Surface Plot commands.
  • Added a "Translate" command to the ROI Manager.
  • Plugins>Install now installs tools with names ending in "Tool.txt", "Tool.ijm" and Tool.class" in the toolbar and saves a more...


  • OS X 10.5 or later
  • Java 1.6 or later

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ImageJ User Discussion

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S/ash Member IconReview+19

I really wish I knew about this app when I was in college. Apart from professional image analysis and general editing, it can be very helpful for students in signal processing/image processing to understand how transforms and filters work.

Thanks to the devs.

Reply0 replies
Version 1.46r
nargot Member IconReview+42

perfect software for all.

from the scientist POV imagej allows us to handle, process and analyse microscope data without the need for prohibitably expensive and sometimes unstable software.

for the non-scientist it can be used for all your image needs including scripting for batch processing.

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Version 1.45m


Spiralsteps Member IconReview+1

Perhaps the most hideously designed software ever written.

Reply4 replies
Version 1.44j

Just had to reply to this terribly misguided opinion from Spiralsteps. ImageJ is quite simply one of the best pieces of software available.


nonsense. very nice software, which is used a lot for image analysis in my lab


it is actually vital software for scientists. its free, scriptable and handles all our obscure file formats (with help from the community)

it may not be totally user friendly however, it is extremely important for us


No doubt: it's not beautiful, doesn't take advantage of all the latest OS X features, etc. It doesn't have the nice polished UI most Cocoa apps offer BUT, it's by far the most powerful and versatile image editor for scientific purposes out there. Scriptable, extendable, more features that you can dream of, and best of all, free!
If you are looking for a nice and friendly image editor, I would understand that you'd want to move on to any of the very nice products out there.
If you want to perform some serious image analysis, then you might want to give it a second look.

Vitaly Member IconComment+55

actually, the downloaded version is Version 1.43r already.

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Version 10.2
ThanosD Member IconReview+4

Excellent work in the public domain. This is the kind of tool you NEED when you are in image processing and want to analyze a new type of image. This saves time and resources, since it provides all functionality I would usually find in either expensive image processing suites or environments, such as Matlab. Congrats to the developers!

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Version 1.4d
Tomis Member IconComment+117

I found it to be extremely buggy. It wasn't able to access an image on the clipboard at all when no other Mac app had a problem with the clipboard image.

Then when opening a JPEG of aprox. 2500x1900 it threw an out of memory error, which is an absolute joke on a 768MB system that had 160MB free at the time. Considering Preview.app opened the same image flawlessly, what gives?

I would give it thumbs down. Maybe wait until they do a Cocoa/Java port? Who knows. It just doesn't feel very polished at this point.

Reply0 replies
Version 1.3.7m
Anonymous Member IconReview

Thanks for this Java program. It's easy to use and it's fast.

Reply0 replies
Version 1.33p
Anonymous Member IconReview

Madena is much better. More controls, better interface, faster and the same price (Free).

Still ImageJ might have its uses (primarilly if you are operating on a cross plaform basis). Either provide control and manipulation of 16-bit level data in either TIFF or DICOM files. Something GIMP can NOT do.

Reply4 replies
Version 1.32i
Anonymous Member Icon

Huge list of bugfixes from 1.32i that I have used for about a week. In that time I've written a couple of plugins to test out some image processing concepts... REMARKABLY easy despite never having written in Java (or C, for that matter) before.

Don't let a simplistic "X is better" deter you if ImageJ looks useful for your purposes. This ain't perfect (I don't see a bugfix for a way that I crashed my version and some Mac-isms don't work right) but it has a very short learning curve to be very useful.

Anonymous Member Icon

To the guy in La-La land: You realize Madena is some 20 MBs, as opposed to ImageJ's less than 1 MB, right?

Anonymous Member Icon

I guess some people read the first sentence and make a conclusion. 20MB with demo images and only 3MB without.


Madena has not been updated for Lion.

user icon+1
Version 1.48t
user icon+92
Version 1.48j
user icon+92
Version 1.46o
user icon+35
Version 1.46h
> 4 10


Current Version (1.x)


Downloads 71,848
Version Downloads 188
License Updater
Date 10 Jul 2014
Platform Intel 64 / OS X / PPC 32 / Intel 32
Price Free