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URL shortening is a technique on the planet Wide web within which an identical Resource locator (URL) could also be made well shorter in length and still direct to the required page. this is achieved by exploitation associate HTTP redirect on a site name that is short, that links to the net page that contains a long universal resource locator. for example, the URL "http://en.wikipedia.org/wiki/URL_shortening" can be shortened to "http://knapp.so/urlwiki", . this is especially convenient for electronic communication technologies like Twitter and Identi.ca that severely limit the number of characters that may be used in a message. Short URLs enable otherwise long web addresses to be named during a tweet. In Nov 2009, the shortened links of the uniform resource locator shortening service Bitly were accessed a pair of.1 billion times.[1]

Other uses of url shortening ar to "beautify" a link, track clicks or disguise the underlying address. though disguising of the underlying address could also be desired for legitimate business or personal reasons, it's receptive abuse and for this reason, some uniform resource locator shortening service providers have found themselves on spam blacklists, owing to the utilization of their airt services by sites attempting to bypass those exact same blacklists. Some websites forestall short, redirected URLs from being announce.

There area unit many reasons to use address shortening. typically regular unshortened links could also be esthetically ungracious. many internet developers pass descriptive attributes in the address to represent information hierarchies, command structures, dealings methods or session info. this could end in URLs that square measure hundreds of characters long which contain complex character patterns. Such URLs square measure troublesome to con, type-out and distribute. As a result, long URLs must be copied-and-pasted for responsibility. Thus, short URLs could also be additional convenient for websites or hard copy publications (e.g. a printed magazine or a book), the latter often requiring that terribly long strings be broken into multiple lines (as is that the case with some e-mail software or web forums) or truncated.

On Twitter and some instant-messaging services, there's a limit to the quantity of characters a message will carry. using a uniform resource locator shortener will allow linking to web pages which might otherwise violate this constraint. Some shortening services, like tinyurl.com, and bit.ly, can generate URLs that square measure human-readable, though the ensuing strings square measure longer than those generated by a length-optimized service. Finally, universal resource locator shortening sites offer elaborate data on the clicks a link receives, which might be easier than fixing associate degree 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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