Do QR Codes Get Reused? What Happens to Old Codes
Do QR codes get reused? A static code always shows the same link. A dynamic one can be pointed somewhere new, and an abandoned link can be taken over.
Nookesh Karri · 7 min read 
QR codes don’t get reused the way phone numbers do. Nobody issues them from a central pool, so a code is just your link drawn as a pattern, and nobody else is handed your code later. What does get reused is the link inside: dynamic codes can be pointed at a new page on purpose, and an abandoned domain or short link can be claimed by someone else.
That second case is the one most guides skip, and it can hurt you.
Do QR codes get reused or run out?
QR codes can’t run out because there is no stock of them. A generator turns your data into a grid of black and white modules on the spot. Denso Wave, which invented the format, defines sizes from Version 1 at 21 x 21 modules up to Version 40 at 177 x 177 modules. Change one character of the link and you get a different pattern.
The flip side surprises people. The same link always gives an equivalent code, so two people who encode the same URL get codes that open the same thing. They may not even look alike. One generator’s documentation explains that 40 versions, four error correction levels and eight masks give “1280 possible QR Codes for any given input.”
So “reuse” never means a stranger receives your code. It means one of three things:
- You point an existing printed code at new content.
- A system treats a code as used up after one scan, by design.
- Someone takes over the address your old code points to.
Static vs dynamic: which codes can you reuse?
A static QR code can’t be reused for new content, because the link is written into the pattern itself. Reprint it on a new flyer and it still opens the original page. That is fine for a Wi-Fi password or a permanent homepage, and a dead end for anything that changes.
A dynamic QR code can be reused as often as you like. The pattern holds a short redirect address, and the redirect decides where people land. With QRAnalytica, for example, you can change the target URL at any time without reprinting the code. If you are not sure which type you printed, here is how to tell a static code from a dynamic one.
Say a café prints a dynamic code on its table tents for a summer menu. In October it points the same code at the autumn menu. Same tents, new page, no reprint. The steps are in our guide to changing where a printed QR code goes.
| Type | Can you point it somewhere new? | Who controls the destination |
|---|---|---|
| Static | No | The link inside the pattern |
| Dynamic | Yes, any time | Whoever runs the redirect |
| Single-use (tickets, activation codes) | No, the system rejects repeat scans | The issuing system |
Single-use codes: when a scan uses the code up
Some QR codes are one-time by design. Event tickets and activation codes often carry a unique ID, and the system behind them marks that ID as used after the first scan. The code still scans afterwards. The server just refuses it.
That rule lives in the issuing system, not in the QR format. If an activation or ticket code fails on a second try, contact whoever issued it. A new copy of the image won’t help.
The risky kind of reuse: old links taken over
An abandoned link is the reuse you don’t choose. If your printed code points at a domain or subdomain you stop paying for, whoever claims that address next decides where every copy of your code sends people.
In July 2026, Sixth Tone reported that criminals in China were rerouting government-registered QR codes whose domains had expired. One Beijing code’s domain lapsed on Feb. 27, and scans soon led to pornographic sites. Experts quoted in the piece put it plainly: QR codes have no built-in security, and the danger is the site they point to.
In September 2026, researcher Farzan Karimi showed a quieter version on a QR platform’s custom short-domain feature. The platform only checked that a DNS record existed, never who was claiming it, iTnews reported. His warning: if a company doesn’t clean up the record after a campaign, “every existing QR code printed for that campaign is at risk.” He said the takeover takes under a minute.
The hard part is that printed codes can’t be recalled. A poster printed years ago still scans today, and it trusts whoever owns the address.
How to retire a QR code safely
Retire a code by keeping control of its address, not by forgetting it. The order I follow:
- List every place the code is printed. Packaging and signs last for years.
- Point dynamic codes at a page you’ll keep. A “this offer has ended” page on your main site is better than a dead link.
- Keep the domain renewed while any print is still around. Domains are typically registered for one to 10 years, so set auto-renew.
- Remove DNS records nobody owns. Karimi’s advice: if a record exists “and nobody on your team owns that integration, remove it today.”
- Scan your old codes once a year and check they land where you expect.
My take: for anything printed in bulk, use a dynamic code on a domain you already own and plan to keep. You get the reuse you want, and nobody can claim the address while you hold it. Our guide to custom short links for business covers setting that up.
What happens to QRAnalytica codes when you stop paying
QRAnalytica codes keep redirecting after a trial or subscription ends. The account drops to the free plan, but existing QR codes are not deleted or disabled, and the redirect doesn’t check your plan before sending people on. Your printed codes keep working, and you can still edit them later.
The limitation: a dynamic code depends on QRAnalytica’s redirect servers, which is what makes editing and scan counts possible. If you want a code with no outside dependency at all, a static code is the only option, and you give up editing. The full trade-off is in dynamic vs static QR codes, and do QR codes expire covers what stops codes working.
If someone scans one of your old codes and worries about where it leads, the FTC’s advice is to inspect the URL before opening it. That habit protects them even if a link you abandoned was taken over.
FAQ
Can two businesses end up with the same QR code?
Only if they encode exactly the same link. A QR code is just the data written as a pattern, so different links always give different codes. Nobody hands out codes from a shared pool.
Will the world run out of QR codes?
No. Codes are not issued or registered, so there is no supply to use up. The pattern simply changes whenever the data changes.
Can I reuse a QR code I already printed?
Yes, if it is a dynamic code. You change the destination in your QR account and the printed code sends people to the new page. A static code always opens the link it was made with.
Can someone else take over my old QR code?
They can if your code points at a domain or short-link subdomain you let lapse. Whoever claims that address next controls where your printed codes go, so keep the domain or redirect the code somewhere you still own.
Sources
- Information capacity and versions of QR Code, Denso Wave
- Is it possible to create different QR codes for the same content
- Abandoned QR code subdomains open to hijacking, researcher says, iTnews
- Scan Scam: Criminals Redirect China’s Public QR Codes to Porn, Sixth Tone
- Scammers hide harmful links in QR codes to steal your information, FTC