Short Link
Definition
A short link is an address, usually under about thirty characters, whose only job is to forward a visitor to a longer address. The shortener stores a mapping from a short code to the real destination and issues a redirect when the code is requested. Codes are typically five to seven characters of letters and digits, which gives billions of combinations from a very small string. Some services let you pick the code yourself, producing a readable slug instead of a random one. The destination can usually be changed later, and that single feature is what separates a shortener from an ordinary address.
Why It Matters
Long URLs break in the places you cannot test. Print one in a newsletter and readers mistype it; paste it into a chat client that wraps lines and the tail is lost. A 250-character address with tracking parameters attached is unusable on a slide or a business card, while a seven-character code is fine. The cost is trust: nobody can see where a shortened link goes, phishing campaigns exploit exactly that, and a shortener on your own domain reads very differently from a generic one.
How It Works
A shortener keeps a table of codes and destinations. When a browser asks for the short address, the service looks up the code and replies with a 301 or 302 status plus a Location header holding the real URL, and the browser then requests that address instead. A 301 says the move is permanent, so browsers cache it — faster on repeat visits, but awkward if you ever want to re-point the code. A 302 is temporary and is the safer default for anything you may change. Most services log the request before redirecting, which is where click counts come from.
Real-World Example
A conference speaker has a handout published at spring-summit-handout.99helpers.site and about thirty seconds on stage to give out the address. She points a short link at it and reads six characters aloud instead of a long path. After the talk she re-points that same short link at a revised handout, so the slide photographs taken by the audience still work. The code stayed put; only the destination moved.
Common Mistakes
- ✕Shortening an address that is already short and readable — you add a hop, a dependency and a new point of failure for no gain
- ✕Using a free shortener for something meant to last a decade — if the service closes, every code it ever issued stops resolving on the same day
- ✕Ignoring what the shortener does to parameters — some drop the query string, and the destination then records the visit as direct traffic
Related Terms
Link Sharing
Link sharing means sending someone a web address that points at your file, rather than sending a copy of the file itself. One address, one source of truth, any number of recipients.
QR Code
A QR code is a square barcode that stores a short piece of text, most often a URL, so a phone camera can open it without anyone typing. It is a picture of a link.
Link Rot
Link rot is the slow decay of working links into dead ones as pages move, domains lapse and services shut down. A large share of links published a decade ago no longer resolve.
URL Slug
The readable, hand-picked part of a web address that names one particular thing — the 'acme-pitch' in acme-pitch.99helpers.site. It is chosen, short and made only of lowercase letters, digits and hyphens.
301 Redirect
A 301 redirect is a response telling the browser that a page has moved permanently and giving the new address. The old URL keeps working for anyone who follows the old link, but everything that matters now lives at the new one.
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