Well you have to know the name of the spider those bots use, for example the httract one is actually named "httract", so in .htaccess put something like this:

RewriteCond %{HTTP_USER_AGENT} HTTrack
RewriteRule ^.* - [F,L]

    ...and hope that the user doesn't change the user-agent string.

      Put Ajax in the page so that either (A) the page is incomplete offline or (😎 the page doesn't even begin to function offline.

      Of course, the broader question is, why would you care if someone views it offline? Isn't it a good thing that they are viewing your page at all?

      And to get technical about it, a web browser downloads stuff first and then displays it "offline" so technically, to protect against downloading and offline browsing, the only solution is to delete your web page from the Internet now.

        Those site downloader things rape your bandwidth though.

          thanks for your answers.

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