This website has a tool that checks for non-secure content on web pages.
As a side effect, performing this check is also supposed to help with the indexing of the entered page.
The best and most popular Web Verifier (SEOs tool): if you are not sure if the website you would like to visit is secure, you can verify it here.
Enter the website address of the page and see parts of its content and the thumbnail images on this site.
None (if any) dangerous scripts on the referenced page will be executed.
Additionally, if the selected site contains subpages, you can verify it (review) in batches containing 5 pages.