Free tool
Robots Checker
I show which pages your robots.txt blocks from Google. Type your site, and optionally a page, to test it the way Googlebot would.
Rules Google follows on this site
robots.txt
How Google reads robots.txt
Google uses the group written for "Googlebot" if there is one, otherwise the group for all bots ("*"). The longest matching rule wins, and if an Allow and a Disallow rule are the same length, Allow wins.
Blocking a page in robots.txt stops Google from reading it, but it can still appear in search without a description. To keep a page out of Google, use a noindex tag and let Google read the page.