No,

Alt attribute is not affecting keyword density, but alt helps to describe image so if we include then it's good for SERP.

No, It's not affecting on keyword density but It will describe image name that's called image optimization, and it will be good for SERP.

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no any attribute affect density. density is about word like how many word used in content and which word use twice or more. where no relation between attribute.

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No, alt attribute does not affect keyword density. Alt attributes doesn't get counts in Keyword density for a page. Keyword density depends on the content based on the site.

Yes alt attributes do count towards the kw density of a page. I dont know about other tools, but surely Google takes them into consideration.

How in the world do any of you know that?

Google has never said here is what does and doesn't count for keyword density.

OP, don't worry about it. Google really does not care about keyword density. Not enough that a alt tag is going to tank your page anyhow.

Frankly, I'm amazed people are still talking about keyword density. That's something people stopped worrying about years ago!

Get it in the title tag, a header and at least once on the page. If it happens more than that, fine but it doesn't really matter. I'd be more concerned with getting related keyword phrases on the page once my main phrase appeared at least once.

No, it describes images in your post that means image optimization.

It totally matters.... your alt tag does contribute to your KW density.

After reading the 'experts' on this thread - my confidence in asking SEO questions on WF has nosedived.

why its does not effect your uploaded images is nothing without alt

I think alt tag is very important for an image because if in case our image has not been showing then it will show alt tag to tell them the image is there but site is not supporting.

Hello,

I want to thank all of you for your help. I really appreciate it, and this is a wonderful way for all to learn from each other.

Personally, I tend to believe keywords in alt attributes influence keywords density at least for the following reasons:

1. alt attributes are seen as text when pictures are used as anchors, and there is some evidence for that. Alt text is seen as a replacement for text when using images as anchors.

So, if Google perceives the keywords within the alt attributes as text in this instance, it seems pretty logic to me it takes them into account when assessing the overall keyword profile for a certain page, thus influencing the keywords density.
2. Google can read HTML code. Alt are HTML attributes, so keywords inserted in these attributes are read, understood and can influence that keyword density, like any other text formatted in HTML code.

So, I think keywords within alt attributes can increase the keyword density.

Now, if this keyword density has or has not an impact, well this is another story. As a side note, I over optimised, like an idiot, a website with many exact match anchors, and I managed to save that site when I started to reduce the density for that keyword, on the targeted page, in the first stage, with clear results. After that I started building new inbound links, with new anchors - anchor text variation.

I am sure the Alt attribute is not affect keyword density and it depends on the content based on the pages, the goal is to describe the image for the search engines, because of the way the look of robots.txt is very different.

No, but I think that it is very important to have alt attributes as it will definitely help in the long run, whether it be SERPs or any other type of Image Optimization it is always better to have something in those values.

Matt Cutts Reveals Google's Updated SEO Copywriting Strategy

This little nugget... "In general, though, if the words are on the web page (not in a spammy way, of course), that makes our job easier because we don't have to rely on synonym matches to find good documents." - Matt Cutts

No you don't have to have the term on the page. Sure that's great.. but if there are pages within a serp you are competing for that dont have the term on the page, that means more than likely those pages could be beat out.

Let me lay this out for you.. you have actual text on the page... you have code. Keyword density is determined by the number of words IE text compared to how many times a "phrase" appears collectively within the code. The URL, the title, Alts, image files, text, H tags etc etc.

This really isn't rocket science to figure out here.. super easy to test.. take a page that say is ranked on page 3 if you like... add some instances of the term - see what happens after a few days.. it may go in the wrong direction... then take some out.

I have found there is not a static percentage to shoot for.. I start with around 1.8% and go from there ( that's 9 instances for 500 words of text ) I have pages that are at close to 5% some that are more towards the 1% mark.

Any and all of us can say yeah it has value.. and we can say "what are you nutz?" Test it for yourself... it takes all of what3 minutes to alter a page.. and a week to get some results back?

I can show you case study after case study the effect of keyword density... I could show you case study after case study the effect of keyword proximity as well.. but you all would not believe any of it.. you would argue there was other cause to the effect.

Like I said.. its just to damn easy not to test. And honestly what is there to lose?

And think about this for a moment.. no one here will disagree that Google will penalize a page where the density is to great no? "not in a spammy way" as Matt Cutts put it. Name me another variable where there is Penalty that there is opposing that, not gain? That's what you are saying when you say - no Google doesn't look at Density.. yes they will penalize you for having to much... but No, there is no benefit for finding a sweet spot. I would say you are kidding yourself.

No, angular position attribute doesn't have an effect on keyword density. angular position attributes does not get counts in Keyword density for a page. Keyword density depends on the content supported the location.