Our company has URLs that are well ranked which is vital for us. But we need to change all the structure of thousands of URLs and I am afraid of a negative impact on our natural indexing and ranking on Google and others search engines.
Examples:
example.com/us/Fine-Art/features/the-olive-trees-van-gogh/
Will become:
example.com/us/Fine-Art/van-gogh/the-olive-trees/
example.com/de/Fine-Art/zeigt/the-olive-trees-van-gogh/
Will become:
example.com/de/Bildende-Kunst/van-gogh/the-olive-trees-van-gogh
All the 301 redirections will be performed by a PHP script which will analyse the URL and make a redirection to the new URL if needed.
If the PHP script works well and all the old URLs are well 301 redirected, and that therefore we have NO 404 linked to this URL restructuring, is there a risk of losing in indexing and ranking?