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URL shortening could be a technique on the world Wide web within which a regular Resource locater (URL) is also created well shorter long and still direct to the specified page. this is achieved by mistreatment an HTTP send on a site name that is short, which links to the online page that contains a long address. for example, the universal resource locator "http://en.wikipedia.org/wiki/URL_shortening" are often shortened to "http://knapp.so/urlwiki", . this is particularly convenient for electronic messaging technologies such as Twitter and Identi.ca which severely limit the quantity of characters which will be employed in a message. Short URLs permit otherwise long net addresses to be brought up in a tweet. In november 2009, the shortened links of the computer address shortening service Bitly were accessed a pair of.1 billion times.[1]

Other uses of universal resource locator shortening ar to "beautify" a link, track clicks or disguise the underlying address. although disguising of the underlying address is also desired for legitimate business or personal reasons, it's receptive abuse and for this reason, some computer address shortening service providers have found themselves on spam blacklists, attributable to the utilization of their send services by sites trying to bypass those very same blacklists. Some websites forestall short, redirected URLs from being announce.

There are several reasons to use universal resource locator shortening. typically regular unshortened links could also be aesthetically graceless. many internet developers pass descriptive attributes within the address to represent data hierarchies, command structures, dealing ways or session data. this will end in URLs that area unit hundreds of characters long and that contain complex character patterns. Such URLs area unit troublesome to learn, type-out and distribute. As a result, long URLs should be copied-and-pasted for dependableness. Thus, short URLs could also be additional convenient for websites or textual matter publications (e.g. a written magazine or a book), the latter usually requiring that very long strings be broken into multiple lines (as is the case with some e-mail software or web forums) or truncated.

On Twitter and a few instant-messaging services, there's a limit to the amount of characters a message can carry. using a url agent can enable linking to web pages which might otherwise violate this constraint. Some shortening services, like tinyurl.com, and bit.ly, will generate URLs that are human-readable, although the resulting strings area unit longer than those generated by a length-optimized service. Finally, computer address shortening sites give detailed info on the clicks a link receives, which may be less complicated than setting up an equally powerful server-side analytics engine.

URLs encoded in two-dimensional barcodes such as QR code are often shortened by a URL shortening in order to reduce the printed area of the code or allow printing at lower density in order to improve scanning reliability.

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