The Joomla! Extensions Directory ™

K2 Popular ComponentModulePlugin

The powerful awarded content extension for Joomla! with more than 1.2 million downloads so far (and counting!)

K2 provides an out-of-the box integrated solution featuring rich content forms for items (think of Joomla! articles with additional fields for article images, videos, image galleries and attachments), nested-level categories, tags, comments, a system to extend the item base form with additional fields (similar to CCK for those acquainted with Drupal), a powerful plugin API to extend item, category and user forms, ACL, frontend editing, sub-templates & a lot more!

Using K2, you can transform your Joomla! website to a news/magazine site with author blogs, product catalogs, work portfolio, knowledge base, download/document manager, directory listing, event listing & more, all this bundled under one package!

Give K2 a try & you'll instantly love it! It's easy to use and fun to develop websites with! If you need any help or want to contribute to the project, join us at the K2 community.

Since K2 is extensible with additional fields to its base item form, you can easily create category-specific content types, e.g. article, blog post, product page, directory listing.

K2 offers as standard:
- nested-level categories (no section/category restrictions)
- commenting, integrated with Google's reCaptcha & Akismet
- tags
- item image (useful for articles/catalogs)
- image galleries
- videos
- attachments
- user pages (author blogs/user profiles)
- smart ACL for frontend editing
- unique plugin system to extend item, category & user forms
- ajax-based frontend editing
- ajax-based comments moderation
- Google AJAX Search integration
- Rest-like JSON/JSONP content output
- Native advanced SEF options (added in K2 v2.6.4+)

K2 fully supports the Joomla! API, which means all Joomla! plugins will function properly within the K2 component & modules, either in the frontend or backend.

========================,,, Groupama Transport, Harvard, the High Court of Australia, MTV Greece, Jaguar Greece are just some of the thousand "big sites" around the world, fully powered by K2.

To utilize the built-in video & gallery features you need to install AllVideos (free) & Simple Image Gallery Pro, both provided by JoomlaWorks.

K2 is developed by JoomlaWorks & licensed under the GNU/GPL license.

Try K2! Install it, hit the "import" button to bring your Joomla! articles inside K2, start playing with the component to see the flexibility it provides first-hand. Moreover? You no longer need a dozen of components & even more modules to do things like run a news site or a blog. Drupal & Wordpress have certainly met their match now!

Visit the K2 website & community:

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Reviews: 2
K2 is simply the best CCK for me because it's doing what we expect first with a CCK, add custom fields to category of content.

And of course it has a lot of specific extensions.

Reviews: 5
First of all thank thank you K2 dev team for a lot of time spent on creating free extension for Joomla! community. My previous speaker said that K2 SEO is bad - everybody who know's anything about search engins optimisation will dissagree with this kind of opinion. K2 provide great SEO compatibility and gives users everything they need to be seo friendly. You can always adjust the script to your needs! Do not forget that SEO is difficult subject and and sometimes expensive work. Please to think twice before adding a review and remember about Joomla community values: freedom, equality, trust, community, collaboration and usability! Grreetings from Poland :)
Owner's reply

"Please think twice before adding a review and remember about Joomla community values: freedom, equality, trust, community, collaboration and usability!"

Couldn't agree more!

Reviews: 4
I've been using K2 for over 3 years now and it is a good component as long as you don't run into issues. Trying to get help in the forums is mind numbingly slow. It's usually only one mod helping everyone "thanks William". There are several legitimate bugs posted in the forums and the Dev never responds. Too bad because the platform it self is great, but there is a serious lack of support.
Owner's reply

Actually, K2 is one if the most actively developed extensions in the Joomla! community. There is of course a separate bug tracker for that, but all bugs reported in the forums are monitored. Of course, most of the times, they're not real bugs but they are just generic Joomla! usage issues, which some users believe are K2 related (they aren't obviously).

Lastly, if you are making money off K2, then consider hiring some of the companies listed in the forum to help you out, or just post your project in the related forum board on Don't expect that the K2 dev team will solve project specific issues you might have, neither will any other open source project.

Reviews: 1
After seeing all the positive remarks regarding K2 I thought wow... this sounds like the best Joomla extension ever! Then I installed it and realised it is just another Joomla extensions.

Then I realised it does not support pagination and wondered why I installed it in the first place.

Documentation is pretty bad too.
Owner's reply

It doesn't do pagination... Hmmm...

Reviews: 1
The K2 is a great tool to get the articles in combination with templates done. But as it seems the architecture of the component is buggy as the articles are available over several urls.

Since my projects also need's a good page ranking this is a no go for me and I have to switch to another tool. (As long as the support from K2 is also very poor as also others writing herein.)
The only thing I want todo with this posting is to get the SEO part in mind of each who is on the way to try K2.
Owner's reply

K2's SEO is not just great, it's in fact amazing. For 2 reasons primarily. No.1 for its native URL construction (to the limit the Joomla! API allows it to be) and no.2 for it's HTML construction with the correct use and ordering of HTML elements.

If by SEO you just mean the URLs, then I suggest you try other extensions before moving away from K2 as you're in for a big surprise! What do I mean? If you don't create menu items to some Joomla! component, yet you retrieve this component's content from some module, you're bound to have /component/name/whatever in the URLs.

So do some homework first before judging something badly.

I'll say this now and I'll keep repeating for a very long time to come: it's no wonder why ALL today's big/popular Joomla! sites are built with K2. ;)

One final tip: Wanna improve your URL SEO drastically? Grab a license for sh404SEF or AceSEF. They both work flawlessly with K2 as we work closely with these 2 dev teams.

Reviews: 7
If your not using K2 you are limiting your sites potential.

I wouldn't have a Joomla site without it. I have categories within categories within categories! It really takes shape after you modify the template or make a few.
Reviews: 17
If you need an all-in-one solution then K2 is a good choice. Lots of the most used add-on functionality are already presents.
I don't have a good feeling with this "I do everything" packages. Is not always possible to replace the components I do not like with 3rd party add-on.
Documentation is poor and dated.

Well, this is only my personal judgment. If you need a simple way to use Joomla with a lot of stuffs then give K2 a try.
Owner's reply

Actually, a lot of people find K2 easier to setup and have running in minutes compared to the default Joomla! article system.

This boils down to a) setup parameter continuity in K2 (unlike the default Joomla! article system which mixes category specific parameters with general ones) and b) simpler yet more efficient template overrides. Just count the template overrides in com_content plus its modules. Or think "why do I need a newsflash module or recent articles module" when they could simply be 1 module with 2 different content retrieval filters (random and latest created)...

We've answered all these questions that puzzled developers minds years ago with the creation of K2. Anyone else who might insist that com_content is better than K2 in terms of content management (and I'm not referring to you - just some so called "Joomla! evangelists" who don't know the difference between HTML and CSS) is either lying or he's never used K2 or he's never used Joomla! at all - in my personal opinion of course.

Reviews: 1
Read bunch of great comments and thought the K2 is great. After installation, i struggled for 2 days and now going to dump the K2.
Used latest K2 for Joomla 2.5.

1. The transfer of items from Joomla was not good - unwanted junk was transferred but the new categories that I created did not transfer. But hey this is small! Categories I can retype manually.

2. More important - comments do not work as promised.
Any unwanted user-spammer can type in his URL link and there is no way to switch it off, unless you ban the user. I did not find an option to forbid outgoing links.

While searching for the solution in K2 comments options - modules etc ( did not find any option to switch off URL from unregistered user) but found CAPTCHA option. Turned CAPTCHA on and it does not work at all - on the page there is claim to put in 2 words , but no words displayed. So no user can use it at all now.

Even worst - that CAPTCHA option disappeared form the module - WOW - not able to turn on, or turn off.

Too many bugs.

Tried to find info on the K2 forum and see that similar questions about comments and CAPTCHA are sitting there for months without any forum support.

So, K2 is for heavy programmers who love to struggle with bugs and debug things.

Frustrating experience.
Owner's reply


1. Migration from the default Joomla! article system is done manually. It's not automatic (why would it be). If you saw "junk" coming into K2 then junk was placed in your Joomla! articles. Of course new categories that you create in the Joomla! article system will not be reflected into K2 unless you import them first.

2. Comments work EXACTLY as they should. You just need to have a clue of the technologies involved before using them. E.g. for reCaptcha to work, you need to get to keys (free) from Had you read the tooltip explanations on each K2 parameter you would've known that of course. Got a problem with real human spammers? Cut them off by enabling the built-in support and/or enabling comment moderation. K2 not only has the best possible anti-spam protection, it also protects your entire Joomla! site from spammers when you enable the built-in options.

To recap things, you've mentioned no bug so far, just misconfiguration from your side. And if you got no response, that's because the answer was sitting right there for you in the K2 parameter tooltips.

Lastly, if K2 was for programmers only, a) it would not have 750.000+ downloads so far and b) it would not be used on high profile Joomla! sites worldwide...

Reviews: 5
The component is really great, combined with K2 Store it's even greater:). Thank's a lot.
Reviews: 1
Good for a free extension,not excelent...and has a lot of bugs yet.For example I have K2 on a site and have set the 'print' and 'email' buttons to show on all items. The Print button works fine but when I test the Email button, the form appears but upon hitting send I get an error message, "Email could not be sent".
So if nobody helps then why using it?
Reviews: 1
I like K2, its one of most popular joomla componets. and I'm really sorry to say that this component is not SEO friend because each item in the website is reachable with different URLs. Since 2 months ago that I installed K2, I have thousands of duplicated articles in my "google webmaster" account, and this problem will affect strongly on google organic traffic, so your site will die as my website. I tried to find a solution on official K2 forum but there were many request about this problem without reply or solution.
Owner's reply

This is not entirely true. Let me explain...

Duplicate entries depend on your menu structure. If you have a menu that maps all your K2 categories (or at least the most imporrtant ones), then you won't have duplicate entries.

To further mitigate that, one of the things we want to add in K2 v2.5.7 is canonical URLs to prevent Google from seeing duplicate item entries (if they exist).

That should further improve K2's SEO features.

Unlike the default Joomla! content or other CCK extensions, K2 already sports much better SEO. From the "read more" links which contain the item's title, to the images, to author links etc. etc. ;)

Reviews: 1
I love this component, use it on just about every site I do. I have always been impressed with everything you guys do! Keep up the good work. Cheers.
Reviews: 1
As Non Commercial Component, K2 is Simply Great, and I really appreciate the efforts of the programming team.
But its not like other open source applications, it lacks documentation, tutorials and training for beginners, specially on the extra fields sections.
Reviews: 6
As simple Joomla! user I was fully satisfied with standard Joomla CCK (if it can be called that). Few months ago I just found it's not enough and just doensn't fit my needs and requirements. So I've checked some free CCKs here and there and finally found K2. I was just overwhelmed by countless options, configuration stuff, possibilities, etc. However - after few hours with K2 Forums, some help-sites and dozens of teste, tries and mistakes I (at last) found this component really easy to use. It wasn't hard to learn, you just need to spend some time with it and play with anything you can find there (on some backup copy of your site, or fresh Joomla! installation for testing purposes only).
Now I can say that K2 is probably the best free CCK ever created for Joomla! It perfectly fills all my needs (and probably yours) - tags, comments system, social buttons, images, videos, extra fields and 10 billion/trillion/gazillion configuration options... looks scary at the beginning, but after few hours the best becomes the beauty, and the curse of complexity becomes a blessing.
I think everyone should give it a try - remember it's free, so it will only cost you some of your time!
Reviews: 3
I just can't build my sites without it! Yes, it has been a long journey learning how to use and customize it, and yes, sometimes I've felt like taming some wild beast, but if you want one of the best tools in your toolbox, you gotta invest time and energy to get to know it.
JoomlaWorks and Fotis - Thank You Very Much for sharing this gem with all of us! It has opened a lot of new doors for thousands of "joomlators". Keep up the good work!
Reviews: 3
Extends core Joomla functionality so well that I wouldn't ever use Joomla without it anymore.

Don't let some of the poor reviews on here put you off - it is not difficult to use, the css is a dream to edit, with very little effort it turns a bog standard Joomla site into a fully featured magazine style website.

An extremely powerful extension. Great job JW.
Reviews: 7
What can I say about K2, it is like reinventing the wheel. It offers everything the core Joomla! doesn't - comments, tags, predefined functionality for videos, galleries, main picture. It's plugin and templating system is incredible and allows very flexible solutions.
You can build amazing things with K2 with lesser time than with the core content extension.

Is there more to want? Well, sure, but still K2 is far ahead in the combination of power and simplicity of use.

What I would love to see? - IP of commenters, blocking/banning commenters by IP, E-mail. Maybe a non-intrusive anti-spam solution like Akismet or Mollom would be great. Of course there are other things to like (a bit improved picture management - auto-crop or so), but still believe me K2 is far far ahead.
Reviews: 1
I love K2. My problem is the intricated schema used to put the pictures. There are no "picture" column in the "k2_items" table and the NAME of the picture is md5 crypted. It sucks! I lost an entire day to understand how it works.
The "heritage" scheme of categories is also confuse. after a couple of changes I lost the control and cannot retore the "default" status.
After all, the intricated CSS file make changes hard to do without a "error and atempt" hours expend.
Reviews: 12
I think for k2 to really improve.
The developers have to get some
people who have never used K2 before.

Ask them to make a simple blog post
using k2? Watch how they use it.

There soon see where this
extension has usability issues.

I hope to see improvement soon.
Reviews: 4
According to me, being a Non Commercial Component, K2 is Simply Great and easy to use once get in to touch.. Only problem what I feel is I dont see any ways to publish a K2 Item in the Front page of my Joomla Site .. Any Ways, Nice Component
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