Hello, I discovered in Google results a lot of wrong pages/urls of my Joomla 3.9.25 site (www.novalunaitalia.com) so I want to fix it and someone in Joomla.org forum suggested me to use your extension.

I use Falang to translate the Italian contents and categories/menu to English. So the urls are generated by Joomla (legacy routing) and Falang translation.

If I install JoomSEF, will the Urls change? I don't want to lose ranking in Google results.
The SEF settings.
Search Engine Friendly URLs Yes
Use URL Rewriting Yes
Add Suffix to URL No
Unicode Aliases No
Site Name in Page Titles After

Thanks

JoomSEF has rich configuration options, so it can be configured to generate the same url you have now. It just takes a little work.