Printing a web address on a book feels harmless. It is a small act of optimism: the address will still work when the reader gets around to typing it. Over the life of a book, it rarely does.
Ways a printed link dies
The launch page comes down. Pre-order pages, launch promotions and "coming soon" pages are temporary by design. Books that mention them are not.
The retailer moves the listing. A platform restructures its URLs, your edition gets a new identifier, or a listing is merged. The old link redirects for a while, then does not.
You change website. New domain, new platform, new author name. The books already in readers' hands point at the old one.
The link was never yours. A social profile, a store page, a payment link: any of them can change their rules or disappear.
The printed text has a typo. Found after 500 copies arrived.
The cost is invisible
A broken link produces no error you will ever see. The reader scans or types, hits a dead page, and moves on. Nobody emails to tell you. You simply never learn how many readers tried.
Put a redirect between the book and the destination
The fix is a layer of indirection. The book carries a short, permanent address that belongs to you. That address redirects to wherever the book should point today. Change the destination and every printed copy follows, including the ones sold years ago.
This is what a dynamic QR code does, and what ScanSpine's codes do: the code points at a short link on our domain, and the link points wherever you set it. Move from a pre-order page to the retailer to your own store, one field at a time, no reprint.
The permanent address has to be permanent
A redirect only helps if the domain it lives on outlasts the book. That is a responsibility we take seriously: ScanSpine codes are issued only under the production domain, and the dashboard warns if a code would point anywhere temporary. If a title's subscription lapses, its codes still resolve to the book's hosted page with the retailer links, so a reader never hits a dead end.
Measure what the link does
Once the redirect is yours, every scan passes through a place you can count. You learn how many readers followed the code, from where, and what they clicked next. The printed book stops being a one-way message and starts reporting back.
If you have already printed a static URL
Nothing can be done for the copies out there except keeping that address alive. For the next printing, use a short address you control, ideally one that resolves through a redirect, and put a QR code beside it. The code is the part most readers will use.