What Is a URL Shortener? Everything You Need to Know
· Explainers · 5 min read
A URL shortener converts long web addresses into short, shareable links. Learn how URL shorteners work, why they matter, and how to pick the right one.
A URL shortener is a web service that takes a long URL and creates a much shorter version that redirects to the same page. When someone clicks the short URL, they are automatically sent to the original destination.
How Does a URL Shortener Work?
When you submit a long URL to a shortener, the service stores the mapping between a unique short slug and your original URL in a database. When a visitor hits the short URL, the server looks up the slug, finds the original destination, and issues an HTTP 301 or 302 redirect — all in milliseconds.
Alias processes redirects in under 50ms on average, using Cloudflare KV edge caching to serve lookups from a data center close to the visitor.
What Are Short URLs Used For?
- Social media: Twitter/X has a 280-character limit. Short URLs save space.
- Marketing campaigns: trackable short links let you measure clicks per channel.
- Print and offline media: short URLs are easier to type from a poster or business card.
- SMS marketing: character limits make short URLs essential.
- QR codes: short URLs produce simpler, more scannable QR codes.
- Affiliate links: replace long, ugly affiliate URLs with clean branded links.
Key Features to Look for in a URL Shortener
Click Analytics
Good URL shorteners tell you how many people clicked a link, where they came from (referrer), what country they are in, and what device they used. Alias provides all of this per-link in your dashboard.
Custom Aliases
Instead of alias.live/x7kp9, you can create alias.live/spring-sale. Branded short links get more clicks because they look trustworthy.
Link Expiry
Set an expiration date on any link. Once expired, visitors see a "link expired" page instead of being redirected. Useful for time-limited promotions or event pages.
QR Code Generation
Every link on Alias automatically gets a downloadable QR code — useful for connecting print materials to digital content.
Free vs. Paid URL Shorteners
Many URL shorteners are free for basic use. Alias is free with no credit card required. Free plans typically include link creation, basic analytics, and QR codes. Paid plans on other services add custom domains, team management, and higher link limits. Alias keeps all core features free.
Try Alias — Free URL Shortener
Alias is a fast, free URL shortener built for individuals and teams. Shorten links in seconds, track every click, and manage everything from one dashboard.