QR codes for libraries

Shelf ends: link the class mark, not the item

The mistake is linking a specific item record: items get borrowed, withdrawn and moved. A shelf-end code should open a canned catalogue search for that classification range, so it stays true as stock rotates. The code on the local-history bay links "everything we hold at this class mark", including the ebooks and digitised material a browser of physical shelves would otherwise never find. That physical-to-digital bridge is the highest-value code in the building.

Shelf ends are read from 30–50 cm, so 3–5 cm of code on matt stock is enough.

Patron privacy is the design constraint

Libraries have a long professional tradition of not recording what people read. Two practical consequences:

• Generate codes client-side. A WiFi code built in the browser means the network password never reaches a third-party server.
• Avoid link shorteners and dynamic-QR providers on catalogue links: they log every scan, which quietly creates a record of reading interest your library never chose to keep.

What earns a code

Placement	Links to
Shelf ends	Canned catalogue search for the range
Study desks	WiFi card, printing instructions
Events poster	Booking page plus a calendar code
Displays	Digitised collection items
Entrance	Opening hours, renewals, membership signup

A good fit for a quiet room

Scanning is silent: no app to install, no sound, no staff interaction needed. For renewals and catalogue lookups it lets patrons self-serve without breaking the room. The usual print checklist applies: matt stock, black on white, quiet zone intact.

FAQ

What should a library shelf QR code link to?

A saved catalogue search for that classification range, not an individual item record. Items move and get withdrawn; a class-mark search stays accurate for years and surfaces ebooks and digitised material alongside the physical stock on the shelf.

Are QR codes a privacy risk in libraries?

The code itself is inert, but the destination matters. Shorteners and dynamic-QR providers log each scan, creating a record of reading interest. Use direct links to your own catalogue and generate codes client-side so nothing about patrons or your network leaves the building.

How big should shelf-end QR codes be?

Shelf ends are read from about 30–50 cm, so a 3–5 cm code comfortably clears the 10:1 size-to-distance rule. Print black on white matt stock and keep at least four modules of quiet zone on every side.