How Long Does a QR Code Last?
A static QR code works forever with no expiry, no subscription, and no dependency on any company staying in business, because the data is baked directly into the pattern itself. A printed copy of that code is a different question — ink can fade, paper can tear, and outdoor weathering can eventually degrade it enough to affect scanning, though error correction provides real tolerance for gradual wear.
These are two genuinely separate questions that get conflated a lot. The first is digital permanence: does the code keep working over time? For a static QR code — the kind QRSen generates — the answer is yes, indefinitely, because the destination or content is encoded directly into the black-and-white pattern at the moment it's created. There's no redirect server in between, no account that needs to stay active, no subscription that can lapse, and no company that needs to keep existing for the code to keep working. This is the basis of QRSen's lifetime guarantee: a code generated today will decode exactly the same way in twenty years, because nothing about how it works depends on anything happening after it's created.
The second question is physical durability, and it's a completely separate concern: will a specific printed copy of that code still be legible after years of real-world wear? Ink fades with UV exposure, paper yellows and can tear or crease, outdoor signage weathers, and lamination can bubble or peel over time. Any of those can eventually reduce the contrast between the dark and light modules, or physically damage part of the pattern, to the point where a scanner can no longer reliably read it. This has nothing to do with the code's digital permanence — the underlying data hasn't changed or expired, but the specific physical object carrying it has degraded.
Error correction gives a printed code real, meaningful tolerance for this kind of gradual damage. QR codes use Reed-Solomon error correction, which stores the data with built-in redundancy, so the code can still be read correctly even if a portion of the pattern is missing, smudged, or obscured. At the highest level (H), a code can typically tolerate roughly 30% of its pattern being damaged and still decode successfully. That's a genuine buffer against fading, scuffing, or a torn corner — but it's a buffer, not immunity, and severe or widespread damage will eventually exceed it.
For a printed code that needs to last years rather than weeks — outdoor signage, equipment labels, anything exposed to sun or handling — a few practical steps help: use high-contrast ink on a durable substrate, consider lamination or UV-resistant printing for anything outdoors, and periodically re-check that an aging printed code still scans cleanly rather than assuming it always will. None of that affects the underlying code's validity; it's purely about keeping the physical copy legible for as long as the digital pattern remains, which is indefinitely.