Redirecting a lot of pages to one page - Google rankings down the drain?

Redirecting a lot of pages to one page - Google rankings down the drain? - If a page has internal and external outgoing links to redirecting URLs, it’s returning 3xx (301, 302, etc.) HTTP status codes standing for redirection. This issue means that the page does not exist on a permanent or temporary basis. It appears on most of the popular web browsers, usually caused by a misconfigured website. However, there are some steps you can take to ensure the issue isn’t on your side. You can find more details about redirecting URLs by reading the Google Search Central overview. In this article, we’ll go over how you can fix the Redirecting a lot of pages to one page - Google rankings down the drain? error on your web browser. Problem :

We have quite a successful site with high rankings on good keywords. Now the website is redesigned to a new one-page website. The keywords pointed to different pages from Google.
What we've been thinking is to put a 301 redirect on all of the different pages (which score well in Google) to the new website (which has only one page).

My question is, as the links from Google might go to a slightly less relevant (less specific) page, will the rankings eventually drop or disappear? And is this duplicate content?

If you have other ideas to keep the rankings as much as possible, I'd love to hear them.
I know it would be better to just keep similar pages on the new website, but the website is only one page and redesigning the full website is not an option.

Solution :

One page websites are very pretty but terrible for SEO, you will lose most if not all of your ranking in a short space of time.

If you redirect in the way you're suggesting your bounce rate will rocket because people searching for relevant content will not find it and this will affect your ranking in the long term. Much better to show a 410 (gone) status to Google for pages which have gone forever and preserve what you can for the ranking of your homepage.

That said the correct method is a 301 permanent redirect.

One thing you could to to help users, rather than Google, is redirect to anchor tags in the page so users are taken straight to similar content rather than being left to figure it out on their own.

We hope that this article has helped you resolve the google, redirects, error in your web browsers. Enjoy browsing the internet uninterrupted!