Bitly (bit.ly)
TinyURL (tinyurl.com)
Ow.ly (ow.ly)
T2M (t2m.io)
Rebrandly (rebrandly.com)
Shorte.st (shorte.st)
Polr (polrproject.org)
is.gd (is.gd)
T.co (Twitter's own URL shortener)
Google URL Shortener (goo.gl) - Note: It's discontinued.
LinkTree (linktr.ee) - Popular for Instagram.
Hyperlink (hlr.io)
Bit.do (bit.do)
Buff.ly (Buffer's own shortener)
YOURLS (yourls.org) - open-source.
Short.cm (short.cm)
Shorby (shorby.com) - Designed for social media.
Soo.gd (soo.gd)
Cutt.ly (cutt.ly)
Tiny.cc (tiny.cc)
Clkim (clkim.com)
Bl.ink (bl.ink)
Linkly (linklyhq.com)
URL Shortener by Zapier (zapier.com)
adf.ly (adf.ly) - Monetized link shortener.
S2.vc (s2.vc)
ShortURL.at (shorturl.at)
URL Shortener Service (url-shortener-service.ir)
LinkSplit (linksplit.io)
Shortlink (shortlink360.com)
Capsulink (capsulink.com)
Shortzon (shortzon.com) - Monetized link shortener.
Uiz.io (uiz.io) - Monetized link shortener.
Lnnkin (lnnkin.com)
ClickMeter (clickmeter.com)
Tiny.ie (tiny.ie)
Urls.im (urls.im)
FireLink (firelink.pro)
Tny.im (tny.im)
1Link.io (1link.io)
Flipmsg (flipmsg.com)
UrlCloud.us (urlcloud.us)
V.gd (v.gd)
Shortify (goshortify.com)
Faslink (faslink.co)
Zii.im (zii.im)
Linker (linker.ee)
Shotly.io (shotly.io)
Slink (slink.app)
Btfy.io (btfy.io)