Google ranking factors

All statements about Google’s search algorithm are based on hints given by Google employees in interviews and press releases. They have also been verified by crosschecking patent applications as well as empirical observations. Nevertheless, the following points aren’t officially confirmed. The following ranking factors have proven themselves in daily practice; websites optimized for these criteria generally obtain a good position in the organic search results.

Keywords in URLs

If a keyword is included in a URL, it lets the search engine know that the site has a certain relevance to the search query. URLs containing keywords are often associated with good Google rankings, although in recent years, keyword domains or subdomains have become less important. Some SEO experts suggest a connection between the word order in the URL and the ranking. They claim the main keyword is more significant if it’s at the beginning of the URL, but repeating the keyword should be avoided at all costs. Regardless of the ranking, keyword domains also have the advantage that the relevant search terms can be highlighted in bold in the search results list.

Keyword in the title tag

Placing relevant search terms in the title tag of an HTML page is even more important than the keyword in the URL. This tag defines the title of a website and counts as an important content element. Equally important is the relevance signal that is sent out by the main keyword in the title tag; it’s theorized that a prominent position at the beginning of the title sends out a stronger relevance signal and therefore has a positive influence on the ranking. Keywords in website titles are presented in bold in the SERPs.

Keyword density

Due to the risk of manipulation, Google doesn’t attribute much importance to keyword density as it used to. Despite this, keywords still serve to convey the topic of a website to the search engine. The absolute frequency of relevant search terms in a text is not as important as how relevant the keyword is. Googles uses the TF-IDF (term frequency-inverse document frequency) of a website, in other words, the keyword density in relation to the inverse document frequency. The latent semantic indexing (LSI) is also used; this forms a thematic cloud of related words from the main keyword. In order to rank highly, a text should not only contain the specified keyword, but also synonyms for it. If the text does contain relevant synonyms, it sends out a stronger relevance signal.

Keyword emphasis

If keywords in a text are emphasized with HTML markups, it signals to the search engine that these words are especially important to the text. A text containing relevant search terms is classified as relevant during the web search and will therefore rank higher. Keywords or keyword phrases can be made to stand out from the rest of the text through bolding, italicizing, underlining, and font size.

Keywords in titles

A special case regarding keyword emphasis is the placing of relevant search terms in the HTML main header (H1) and in the sub headings (H2 and H3). Google rates keywords in these structural elements very highly since they act as relevance signals and facilitate the understanding of the website content

Keyword stemming

Google reduces variants of a search term into one collective word stem. SERPs take into account sites that contain keywords in different grammatical forms as well as websites with exact match keywords. It can be assumed, on the contrary, that texts exclusively containing exact match keywords may not rank as well since conjugating search terms is part of the natural creation process of texts.

Keyword in alt attribute

The Google crawler might be effective at interpreting texts, but its understanding of image elements isn’t so great. The information has to be written in the HTML code in order to convey to the crawler what an image displays and whether it has anything to do with the thematic context of the website content. To achieve a good ranking you should include all essential information in the file, the title, and in the image caption, as well as in the alt attribute. Lastly, don’t forget the description of the image, which will be shown as alternative text in case an error prevents the image from being shown.

Multimedia content

Google ranks multimedia elements such as images and videos much higher since they are more interesting for the visitor. Placing information on different channels offers more value to users and so these websites appear higher in the SERPs.

Readability

What’s known for certain is that Google analyzes the comprehensibility of texts on websites. Whether this information flows into the algorithm for the website or how it’s evaluated remains to be seen. On the one hand, texts with smaller read requests and a lower reading level can have a positive influence on the search engine ranking since they are understandable for a wider audience. On the other hand, a higher reading level is a quality feature. The readability index can help to differentiate filler texts from high-quality content. To make the site as user-friendly as possible, website owners should ensure that the content is readable. Texts that are formulated with the target group in mind increase the retention time on the website, a factor that has been proven to influence the ranking. You can find practical text analysis tools here: http://www.online-utility.org/text/analyzer.jsp

High-quality outbound links

Links that lead from one site to another are known as outbound links. Web crawlers are programmed to follow these links. If the links from your website lead to high-quality sites, they can positively influence the ranking of that site. Outbound links also helps the web crawler to determine the site’s theme. It’s important not to include too many as they can distract from the main content. You should also regularly check the links to make sure none of them are dead. If any lead to a dead end, there’s more chance of Google seeing the site as outdated and devaluating it.

Inbound links

Unlike outbound links, inbound links (also called backlinks) are links that lead from other websites to yours. SEO experts have suggested a possible correlation between a site’s inbound links and its ranking in the organic search results. This assumption is supported by the fact that a noticeable amount of websites with high-quality backlink profiles can be found on the top spots in the SERPs. Professional search engine optimization places great significance on improving a website’s backlink structure. A high link popularity has, in most cases, a positive influence on the Google ranking.