SEO Optimization images has become more and more important in SEO (Search Engine Optimization) for websites. The ALT attribute is a critical step that is often overlooked. This is often a lost opportunity for better rankings.
In Google's webmaster guidelines, they advise the use of alternative text for that images in your site:
Images:. Use the alt attribute to supply descriptive text. Additionally, we recommend utilizing a human-readable caption and descriptive text round the image.
Why would they ask us to do that? The answer is simple, really; search engines like google have the same problem as blind users. They can't begin to see the images.
Many webmasters and inexperienced or unethical SEOs abuse using this attribute, attempting to stuff it with keywords, looking to achieve a particular keyword density, which isn't as relevant for rankings now as it once was.
On the contrary, high keyword density can, on some search engines, trigger spam filters, which may create a penalty for your site's ranking. Even without this type of penalty, your site's rankings won't take advantage of this plan.
This method also puts persons who use screen readers in a greater disadvantage. Screen readers are software-based tools that really read aloud the items in what's shown on the screen. In browsing the net, the alt attributes of images are read aloud as well.
Imagine listening to a paragraph of text that is followed by repetitions of numerous keywords. The page would be not even close to accessible, and, to put it bluntly, will be found quite annoying.
What is an Alt attribute?
An ALT attribute shouldn't be used like a description or a label to have an image, though many people use it in that fashion. Though it may appear natural to assume that alternate text is really a label or perhaps a description, it is not!
What used inside an image's alt attribute ought to be its text equivalent and convey the same information or serve exactly the same purpose that the image would.
The thing would be to supply the same functional information that the visual user would see. The alt attribute text should be the "stand in" when the look is unavailable. Ask yourself this: Should you replace the image with the text, would most users get the same basic information, and wouldn't it generate the same response?
Some examples:
Some SEO Optimization Tips
If a search button is really a magnifier or binoculars its alt text ought to be 'search' or 'find' not 'magnifying glass' or 'binoculars'.
If an image is supposed to convey the literal items in the image, a description is suitable.
If it's meant to convey data, then that data is what's appropriate.
If it's meant to convey the use of a function, then the function is what should be used.
Some Alt Attribute Guidelines:
Always add alt attributes to images. Alt is mandatory for accessibility and for valid XHTML.
For images that play only a decorative role within the page, use an empty alt (i.e. alt="") or perhaps a CSS background image so that reading browsers do not bother users by uttering things like "spacer image".
Remember that it's the function from the image we are trying to convey. For instance; any button images should not range from the word "button" in the alt text. They ought to emphasize the action performed by the button.
Alt text should be determined by context. Exactly the same image in a different context may require drastically different alt text.
Attempt to flow alt text with the rest from the text because that's how it is going to be read with adaptive technologies like screen readers. Someone listening to your page should hardly be aware that a graphic image can there be.
Please remember that utilizing an alt attribute for every image is needed to satisfy the minimum WAI requirements, which are used as the benchmark for accessibility laws in UK and also the rest of Europe. They are also necessary to meet "Section 508" accessibility requirements in the US.
It is important to categorize non-text content into three levels:
Eye-Candy
Mood-Setting
Content and Function
I. Eye-Candy
Eye-Candy are things that serve no purpose other than to make a site visually appealing/attractive and (oftentimes) satisfy the marketing departments. There isn't any content value (though there might be value to some sighted user).
Never alt-ify eye-candy unless there is something there which will boost the usability of the site for someone utilizing a non-visual user agent. Use a null alt attribute or background images in CSS for eye-candy.
II. Mood-Setting
This is the middle layer of graphics which may actually set the atmosphere or set happens as it were. These graphics are not direct content and could 't be considered essential, but they are essential in they help frame what is going on.
Try to alt-ify the 2nd group as is sensible and is relevant. There may be times when doing so might be annoying or detrimental with other users. Then avoid it.
For instance; Alt text that is identical to adjacent text is unnecessary, as well as an irritant to screen reader users. I recommend alt="" or background CSS images in such instances. But sometimes, it's vital that you get this content inside for those users.
Most times it depends on context. The same image inside a different context may need drastically different alt text. Obviously, content should always be fully available. The way you use this case is a judgment call.
III. Content and Function
This is where the look may be the actual content. Always alt-ify content and functional images. Title and long description attributes can also be so as.
The main reason many authors can't understand why their alt text isn't working is they don't know why the images exist. You have to determined exactly what function a picture serves. Think about what it is concerning the image that's important to the page's intended audience.
Every graphic has a reason for being on that page: since it either enhances the theme/ mood/ atmosphere or it is advisable to what are the page is trying to explain. Understanding what the look is for makes alt text simpler to write. And exercise writing them definitely helps.
A method to check the usefulness of alternative text is to imagine reading the page on the phone to someone. An amount you say when encountering a particular image to make the page understandable towards the listener?
Besides the alt attribute you've got a couple more tools at your disposal for images.
First, in level of descriptiveness title is in between alt and longdesc. It adds useful information and can add flavor. The title attribute is optionally rendered by the user agent. Remember they are invisible and not shown as a "tooltip" when focus is received via the keyboard. (So much for device independence). So use the title attribute only for advisory information.
Second, the longdesc attribute points to the URL of a full description of the image. When the information contained in an image is essential towards the concept of the page (i.e. some important content will be lost when the image was removed), a longer description compared to "alt" attribute can reasonably display ought to be used. It can offer rich, expressive documentation of the visual image.
It ought to be used when alt and title are insufficient to embody the visual qualities of the image. As Clark [1] states, "A longdesc is a long description of the image...The goal is to use any period of description necessary to impart the details from the graphic.
It wouldn't be remiss to hope that a long description conjures a picture - the image - in the mind's eye, an analogy that holds true even for that totally blind."
Even though alt attribute is mandatory for web accessibility and for valid (X)HTML, not all images need alternative text, long descriptions, or titles.
In many cases, you're better off just choosing your gut instinct -- if it's not essential to incorporate it, and if you don't have a strong urge to do it, don't add that longdesc.
However, if it's necessary for the entire page to work, then you have to include the alt text (or title or longdesc).
What's necessary and what's not depends a lot on the function of your image and it is context about the page.
The same image may need alt text (or title or longdesc) in a single spot, although not in another. If an image provides simply no content or functional information alt="" or background CSS images may be appropriate to use. However, if the image provides content or adds functional information an alt will be required and maybe a long description would be so as. Oftentimes this kind of thing is really a judgement call.
Image Seo optimization Tips
Listed here are key stages in optimizing images:
Choose a logical file name that reinforces the keywords. You can use hyphens in the file name to isolate the keyword, but avoid to exceeding two hyphens. Stay away from underscores as a word separator, such as "brilliant-diamonds.jpg";
Label the file extension. For example, when the image internet search engine sees a ".jpg" (JPEG) file extension, it's likely to assume the file is really a photo, and when it sees a ".gif" (GIF) file extension, it's likely to assume that it is graphic;
Ensure that the text nearby the image that is relevant to that image.
Again, don't lose an excellent opportunity to help your website with your images in search engines. Use these steps to rank better on all of the engines and drive increased traffic to your site TODAY.