A compact redirect URL (often on a branded domain) that sits behind a dynamic QR code, keeping the encoded payload tiny so the printed symbol stays small, sparse, and easy to scan.
A short link is a brief URL — typically a short domain plus a few characters, like brand.to/sale25 — that redirects to a longer destination. In the QR code world, short links are the engine inside dynamic QR codes: instead of encoding a 120-character campaign URL directly into the symbol (forcing a dense, hard-to-scan code), the generator encodes a 20-character short link, and the redirect service resolves it to the full destination at scan time.
Density is the reason short links exist
QR code density is driven almost entirely by payload length. Every extra character pushes the symbol toward a higher version with more, smaller modules. A 120-character URL at Error Correction Level M needs around Version 9 (53×53 modules); the same destination behind a 22-character short link fits in Version 3 (29×29). At a fixed print size, the short-link code has modules nearly twice as wide — dramatically easier for phone cameras, especially in poor light or at a distance. Shortening the payload is the single highest-leverage optimization available to a QR designer, and short links are how you do it without losing the destination.
Branded versus generic short domains
Short links can live on a generic shortening domain or on a branded one (yourbrand.link/offer). Branded domains earn more scan trust — users who preview the URL see your name, not a stranger's — and they protect you from the reputation problems of public shorteners, whose domains are sometimes flagged by security filters because of abuse by others. They also survive provider changes better: if you control the domain, you can repoint it to a new redirect service without reprinting codes.
Anatomy of a redirect
A production short-link service does more than a 301 redirect. At minimum it records the scan (timestamp, coarse device and geography), enforces the current destination mapping, and appends any configured UTM parameters before forwarding. Better services add link expiration, password protection, device-based routing (send iOS users to the App Store and Android users to Google Play), and A/B destination testing. All of this logic lives behind the short URL, invisible to the scanner but powerful for the owner.
Longevity and ownership
The caution with short links mirrors that of dynamic QR codes: the link must resolve for as long as printed codes circulate. Free or anonymous shorteners owe you nothing and may recycle or delete links; links on domains you control, backed by a service with explicit longevity commitments, are the safe choice for print. Before printing at volume, verify the redirect chain end to end — scan the code, confirm the landing page, check that UTM parameters survive, and confirm the link works from a logged-out browser with no cookies.
Diagram description: Comparison of two QR symbols: one encoding a 120-character URL (dense, Version 9) and one encoding a 22-character short link (sparse, Version 3), with module widths labeled at the same print size.