How to replace a QR code you already printed

When a printed code stops working, you rarely need to reprint everything. Here are the fixes, from cheapest to most thorough.

1. Stickers over the old code

Print the new code on opaque labels a little larger than the old code, and stick them on top. Opaque or "cover-up" labels matter: a thin label can let the old pattern show through and confuse scanners.

2. Reprint only what customers see most

Table tents, window signs and the front of a menu do most of the work. Replace those first and cover the rest with stickers.

3. Make the next code impossible to hold hostage

Packaging and large print runs

If codes are on packaging already in stores, a sticker fix may not be possible. In that case it is often cheaper to keep paying the old provider until the stock sells through, and print the new code on the next run.