Short URL

Short URLs convert long URLs to brief strings via redirect servers. For QR codes, shorter URLs mean lower versions and smaller physical sizes - a 100-character URL needs Version 7 (45×45 modules) while 20 characters needs only Version 3 (29×29).

Security concern: shortened URLs hide actual destinations, and combined with QR codes, URLs are doubly obscured. Enterprises should use custom short domains (go.example.com/abc) so users can assess link trustworthiness.