Build the exact robots meta tag your page needs. Toggle indexing, link following and snippet controls, then copy the tag plus the matching HTTP header version.
noindex keeps a page out of search results while nofollow tells crawlers not to pass ranking credit through its links. noarchive blocks cached copies, nosnippet hides text snippets, noimageindex excludes the page's images from image search, and max-snippet / max-image-preview / max-video-preview fine-tune how much of your content can appear in results.
The meta tag works for HTML pages; the X-Robots-Tag header covers everything else like PDFs and images, set in your server config. The tool outputs both so you can pick the right one. Remember that noindex is a request crawlers honor, not access control: block truly private content with authentication instead.