Yes, you can change website addresses, but before that you should redirect all visitors to the new domain (and also you should redirect all internal pages to internal pages of your new domain).
And also it is important that your old domain’s search engine rankings should be copied to new domain otherwise it start with fresh page.
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Yes, definitely you can. Just 301 redirecting the corresponding old URLs to the new URLs. In initial after you did this, you may experience a drop in rankings. Once your new URLs got indexed, you can expect the same position that you had earlier.
Yes you can change your domain name avoiding the current ranking positions.only the quality of the browsing experience for users should be maintained through the move so that human visitors don't end up being put off.
1) purchase a new domain
2) Upload a “coming soon” page
3) associate the existing IP address with the new domain
4) use 301 redirect to permanently redirect traffic from the old URL to the new one
add and verify the new domain on Google analytics and Google Webmaster Tools
Specify the address change in Google Webmaster tools by completing the form
in Change of Address under Configuration.
Yes, of course, You will have to make 301 redirections to the new domain. After redirection, your ranking will be little down for a while and after some time it will start recovering.