Google SERP (search engine results page) summary description length

These are different ways of saying:
google description character limit

Answer: 155 characters can be shown on Google’s summary of your web page google search results paragraph listing.

description under link from google search
summary length on search results

Maximum Characters for Meta Tag Description in Google SERP :
155 characters can be shown on Google’s summary of your web page depending upon the word boundary and where it’s truncated.
Google will grab description text from the web page if it does not “like” the Meta tag supplied one, according to Susan Moskwa talking about Meta Descriptions somewhat vaguely, (works at Google but in WA). I think the total character limit is 155 characters, sometimes as short as 145.

This description of your webpage is shown in google directly underneath your page title. Whether the text is grabbed from your webpage or from your Meta Description, it will be cut off at 155 characters.

If you have a situation where google cannot see or get any text from your website, such as a website made with Flash, then your meta tag for description is vital, because you will have nothing under your link which provides no compelling reason for anyone to click on your link. Google has been working on specifically reading this tag in the case of Flash, otherwise, it’s the case of the previous sentence, worthless.

HTML code length: (this is not the length shown on the SERP summary, it’s just what is indexed by Google)
It has been noted that Google places most emphasis on indexing the first 150 words on the webpage (counting code in the html), recommended to place Javascript and CSS in a separate file or at the end of the page.

Maximum Characters for Meta Tag Keywords:
For Google? Useless. Most search engines now ignore this Meta Tag.
If you have a situation where google cannot see or get any text from your website, such as a website made with Flash, then your meta tag for keywords is vital, because you will have nothing in the search engine index for keywords other than your domain name and page titles!

For other search engines, 255 characters is a good number. Don’t stuff the keywords more than 3 times is thought to be safe.

Another thing to note is that the Meta Tag for Description has no bearing on your website’s standing on a search. It’s only for humans to read a summary to determine whether they want to click on your link.

There is speculation that it is used to determine the uniqueness of a page, I have doubts about that.

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