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URL shortening is a technique on the world Wide web within which a regular Resource surveyor (URL) could also be made substantially shorter in length and still direct to the desired page. this is achieved by mistreatment Associate in Nursing http redirect on a website name that's short, which links to the web page that contains a long address. for example, the uniform resource locator "http://en.wikipedia.org/wiki/URL_shortening" are often shortened to "http://knapp.so/urlwiki", . this can be especially convenient for electronic communication technologies like Twitter and Identi.ca that severely limit the quantity of characters that will be used in a message. Short URLs enable otherwise long web addresses to be cited during a tweet. In November 2009, the shortened links of the uniform resource locator shortening service Bitly were accessed two.1 billion times.[1]

Other uses of universal resource locator shortening square measure to "beautify" a link, track clicks or disguise the underlying address. though disguising of the underlying address may be desired for legitimate business or personal reasons, it is hospitable abuse and for this reason, some url shortening service suppliers have found themselves on spam blacklists, thanks to the use of their redirect services by sites trying to bypass those exact same blacklists. Some websites prevent short, redirected URLs from being denote.

There ar many reasons to use computer address shortening. typically regular unshortened links may be aesthetically ungracious. many net developers pass descriptive attributes in the url to represent information hierarchies, command structures, group action paths or session data. this may end in URLs that ar many characters long which contain advanced character patterns. Such URLs square measure difficult to con, type-out and distribute. As a result, long URLs should be copied-and-pasted for responsibility. Thus, short URLs could also be more convenient for websites or textual matter publications (e.g. a written magazine or a book), the latter usually requiring that terribly long strings be broken into multiple lines (as is that the case with some e-mail computer code or net forums) or truncated.

On Twitter and a few instant-messaging services, there is a limit to the quantity of characters a message can carry. using a computer address shortener can allow linking to web pages which would otherwise violate this constraint. Some shortening services, such as tinyurl.com, and bit.ly, can generate URLs that are human-readable, although the ensuing strings area unit longer than those generated by a length-optimized service. Finally, url shortening sites give elaborate info on the clicks a link receives, which may be easier than fitting Associate in Nursing 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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