The security issue associated with compressed URLs is that they can be used to mask malicious intent. Criminals can use shortened URLs to direct victims to phishing sites or initiate a download of malicious software onto their device. If you are suspicious of a shortened URL, it is recommended not to click it. Instead, you can use various methods to reveal the full URL behind a shortened URL. It is also suggested not to use a shortened URL if people must log in, and to be clear about the destination when you must use short URLs.