QRHub Blog
Straight answers about QR codes: why they expire, why they stop working, and how to make one that lasts forever.
- Do QR codes expire? The complete answerStatic QR codes never expire. Dynamic ones stop working when someone stops paying. Here is how to tell which one you have — before you print it.
- Why is my QR code not scanning? 12 causes and fixesA QR code that will not scan usually fails for one of twelve reasons. Work through them in order — the first three account for most cases.
- Static vs dynamic QR codes: what nobody tells youThe difference is not technical sophistication. One holds your data, the other holds a rented redirect. Choose before you print, not after.
- Why your WiFi QR code connects to nothingA WiFi QR code that scans but never joins the network usually fails on escaping, a mistyped name, or the wrong security type. Here is how to find which.
- The minimum size a QR code can be printedThe usual answer of 2 x 2 cm is only right for short content. The real minimum depends on how much data you encoded and how far away it is read.
- Adding a logo to a QR code without breaking itA logo works because error correction rebuilds what it covers. Here is how much you can cover, why the level must go up, and where people get it wrong.
- Are QR codes safe? Quishing and how to protect yourselfA QR code is just text you cannot read. That is the whole risk. Here is what attackers actually do with it and the habits that defeat them.
- Error correction levels explained: L, M, Q, HHigher error correction survives more damage but makes the code denser — and denser codes are harder to scan. Choosing well means knowing which risk you face.
- QR codes for restaurant menus: a complete guideMenu QR codes fail in predictable ways: expired links, laminated glare, codes too small on table tents. Here is how to set one up that keeps working.
- Do QR codes work without internet?Scanning never needs a connection. What happens next usually does — but four common types work completely offline, and one of them is the most useful of all.
- QR codes on business cards: what to actually encodeA vCard saves to the phone and works offline; a link stays editable. What to encode on a business card, how short to keep it, and how small is too small.
- QR codes for teachers: uses that hold up in a classroomAnswer keys, lab safety notes, reading links and the classroom WiFi. How to make static codes that survive the school photocopier and still work in three years.
- QR codes for real estate listings and yard signsA yard sign is scanned from a car, in daylight, from three metres. Here is the size, the finish and the link strategy that survive until the property sells.
- QR codes for events: check-in, agendas, badges and signageA crowded venue kills mobile signal. Use offline QR types for badges, WiFi and session agendas, size signage properly, and be honest about check-in.
- QR codes on product packaging: what to get rightPackaging is the highest-stakes place to print a QR code. Curved surfaces, gloss, flexo ink spread and dead links — how to get it right before the plates are cut.