QR code works on one phone but not another: why
Phones differ in camera quality, focus speed and software. A marginal code, one that is small, blurry or low in contrast, may scan on a good camera and fail on a weaker one.
The goal is a code that scans on every phone.
Why does the code scan on one phone only?
Different cameras focus and process images differently. A phone with a better camera or sharper focus can read a code that an older phone cannot.
How do I make it work on every phone?
Print it larger, keep strong contrast, include the white border, and shorten the link so the squares are bigger.
- Test on an older phone.
- Avoid gloss and glare.
Is the older phone out of date?
Sometimes the camera app needs an update, or a scanner app is needed. Most recent phones scan codes with the built-in camera.
Questions
Which phones should I test?
One iPhone, one Android, and one older model if you can.
Can the code be fixed?
Yes, by printing it better.
Does lighting matter?
Yes.
Is it my camera?
Wipe the lens and try again.
What if only one person has trouble?
Check their camera settings.
Get a dynamic QR code for $3
Pay once. Pick the page your code opens, print it wherever you need it, and change the page whenever you like.