So, you want to hide your web page (URL/link) from search engine bots and do not want to use robots.txt. You can do this with the help of noindex meta tags. Just put the below code in your web page code, anywhere after <head> and before the closing </head> tag.
The above code will hide your web page to show up in search results pages. If you know any other quick tip related to this, please share with us in comments.
