getlinkinfo.comは安全ですか？

This is excellent short-URL unshortening service reveals the URL of each hop in a chain-redirection among multiple locations, and the Google Safe-Browsing rating for each URL. Inferior unshortening services only reveal the URL of the final landing page, leaving potentially malicious intermediate URLs undisclosed. In any case, you should additionally test each URL with Virus Total (and/or similar security vendors) because Google Safe-Browsing is often too lenient in its assessments.