There's significant variance from one service to another when it comes to uptime, for example, while on the other hand given that the process involves using an HTTP redirect there’s also the latency issue. But perhaps more importantly is the fact that they obscure the target address and thus may be used to trick users to an unexpected destination.
This means users are susceptible to something as innocent as being rickrolled to potentially much more harmful exposure, like being redirected to scamming websites or malware-ridden pages. Fortunately, there are several ways to peek behind a shortened URL to see exactly where the link will take you before clicking it, so let's take a quick look at a few of them.
Is.gd does the same thing by adding a hyphen at the end of the URL (http://is.gd/jatQq-), while on TinyURL you can see where the link leads by prefixing the word "preview" to the front of the URL (http://preview.tinyurl.com/32jre2o). These are the most commonly used services but a more comprehensive list can be found here.
Unfortunately not all services offer the ability to preview the original address before visiting it. If someone else sends you a shortened link from one of these sites and you want to preview it, you may still be able to do so using a third-party service. ExpandMyURL.com and LongURL offer this functionality.
Links will be automatically replaced with their original address but keeping the same number of characters.
Simply drag one of the previous links to your bookmarks bar and clicking them will replace any short links in the active page with their original address while keeping the same number of characters.
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