URL shortening

URL shortenerURL shortenerslink shortenershort URLsshortened URLadf.lyshortened URLsshorterURLURL shortening service
URL shortening is a technique on the World Wide Web in which a Uniform Resource Locator (URL) may be made substantially shorter and still direct to the required page.wikipedia
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URL redirection

redirectredirectionredirected
This is achieved by using a redirect which links to the web page that has a long URL.
URL shortening services provide a solution to this problem by redirecting a user to a longer URL from a shorter one.

Permalink

permalinkspermanent links
A friendly URL may be desired for messaging technologies that limit the number of characters in a message (for example SMS), for reducing the amount of typing required if the reader is copying a URL from a print source, for making it easier for a person to remember, or for the intention of a permalink.
Sometimes URL shortening is used to create them.

Domain hack

domain hacksdomain hackingopportunistic
Makers of URL shorteners usually register domain names with less popular or esoteric Top-level domains in order to achieve a short URL and a catchy name, often using domain hacks.
This makes them potentially valuable as redirectors, pastebins, base domains from which to delegate subdomains and URL shortening services.

TinyURL

tinyurl.com
The first notable URL shortening service, TinyURL, was launched in 2002.
TinyURL is a URL shortening web service, which provides short aliases for redirection of long URLs.

Bitly

bit.ly
In November 2009, the shortened links of the URL shortening service Bitly were accessed 2.1 billion times.
Bitly is a URL shortening service and a link management platform.

Clean URL

Semantic URLfriendly URLSearch engine friendly URLs
A friendly URL may be desired for messaging technologies that limit the number of characters in a message (for example SMS), for reducing the amount of typing required if the reader is copying a URL from a print source, for making it easier for a person to remember, or for the intention of a permalink.

.ly

ly
Top-level domains of countries such as Libya (.ly), Samoa (.ws), Mongolia (.mn), Malaysia (.my) and Liechtenstein (.li) have been used as well as many others.
Many popular URL shortening services are registered in the .ly domain: brief.ly, adf.ly, bit.ly (former default for Twitter), ow.ly (default for HootSuite), and 3.ly.

Google URL Shortener

goo.gl
Google URL Shortener, also known as goo.gl, is a discontinued URL shortening service offered by Google.

Twitter

tweetedtweettweets
On Twitter and some instant messaging services, there is a limit to the number of characters a message can carry however, Twitter now shortens links automatically using its own URL shortening service, t.co, so there is no need to use a separate URL shortening service just to shorten URLs in a tweet.
The 140-character limit also increased the usage of URL shortening services such as bit.ly, goo.gl, tinyurl.com, tr.im, and other content-hosting services such as TwitPic, memozu.com and NotePub to accommodate multimedia content and text longer than 140 characters.

Hootsuite

ow.ly
Hootsuite uses the URL shortener ow.ly to shorten URLs submitted to its service.

World Wide Web

WebWWWthe web
URL shortening is a technique on the World Wide Web in which a Uniform Resource Locator (URL) may be made substantially shorter and still direct to the required page.

URL

URLsUniform Resource Locatorweb address
URL shortening is a technique on the World Wide Web in which a Uniform Resource Locator (URL) may be made substantially shorter and still direct to the required page.

Web page

webpageweb pageswebpages
This is achieved by using a redirect which links to the web page that has a long URL.

Domain name

domaindomain namesdomains
Often the redirect domain name is shorter than the original one.

Character (computing)

charactercharacterstext
A friendly URL may be desired for messaging technologies that limit the number of characters in a message (for example SMS), for reducing the amount of typing required if the reader is copying a URL from a print source, for making it easier for a person to remember, or for the intention of a permalink.

Email

e-mailelectronic maile-mails
Thus, short URLs may be more convenient for websites or hard copy publications (e.g. a printed magazine or a book), the latter often requiring that very long strings be broken into multiple lines (as is the case with some e-mail software or internet forums) or truncated.

Internet forum

forumforumsmessage board
Thus, short URLs may be more convenient for websites or hard copy publications (e.g. a printed magazine or a book), the latter often requiring that very long strings be broken into multiple lines (as is the case with some e-mail software or internet forums) or truncated.

Instant messaging

instant messengerIMinstant message
On Twitter and some instant messaging services, there is a limit to the number of characters a message can carry however, Twitter now shortens links automatically using its own URL shortening service, t.co, so there is no need to use a separate URL shortening service just to shorten URLs in a tweet.

QR code

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

SMS

Short Message Servicetext messagetext messages
Some websites create short links to make sharing links via instant messaging easier, and to make it cheaper to send them via SMS.

Unique key

keykeysprimary key
In URL shortening, every long URL is associated with a unique key, which is the part after its top-level domain name.

List of HTTP status codes

HTTP status codestatus codeHTTP status codes
Not all redirection is treated equally; the redirection instruction sent to a browser can contain in its header the HTTP status 301 (Moved Permanently), 302 (Found), 307 (Temporary Redirect) or 308 (Permanent Redirect).

Senary

6base 6base 36
Keys can be generated in base 36, assuming 26 letters and 10 numbers.

List of numeral systems

septenary1115
In this case, each character in the sequence will be 0, 1, 2, ..., 9, a, b, c, ..., y, z. Alternatively, if uppercase and lowercase letters are differentiated, then each character can represent a single digit within a number of base 62 (26 + 26 + 10).

Hash function

hashhashinghashes
In order to form the key, a hash function can be made, or a random number generated so that key sequence is not predictable.