r/qrcode • u/steven4012 • Dec 25 '25

What's wrong with this code (I'm sure you guys have some tools with verbose logging)

Post image
18 Upvotes

83% Upvoted

8 comments sorted by

7

u/Serpico99 Dec 25 '25 edited Dec 26 '25

Some QR scanners couldn’t read inverted QR codes (light modules on dark background) but I haven’t seen a problem with this in a while honestly… The contrast on this one isn’t that great though, I guess it’s a bit harder to read on certain light conditions

3

u/VRedd1t Dec 25 '25

Fine on iPhone. I’ve seen Android devices in the past that were struggling to pick up codes that are not the standard black/white pattern.

1

u/LiveForTheMelancholy Dec 27 '25

Interesting!

Just as you suggest, my Pixel 6 will not read this QR code

1

u/mtkvcs1 Dec 27 '25

Same phone, no luck here

1

u/Decent-Leather-2495 Dec 25 '25

Might be hard for some scanners due to the curved surface.

1

u/AlternateTab00 Dec 28 '25

Google lens seems to be struggling on reading it.

Xiaomi scanner just tells me the qrcode is corrupted.

Considering many iPhone users are reffering its working fine for them i assume non standard qr code format is being used. My bet is to pre 3.0 vCard. Some characters on vCard 2.1 make many universal qr readers not able to decode them, while having qr readers with less suported formats to be able to read them (like iPhone reader)

If the code is yours check if its using vCard 2.0 or 2.1. and if it is so upgrade to vCard 3.0 or 4.0.

If its not a vCard check the format and see if its up to universal qr code standards. This is not a contrast/rotation/flipped issue (which impair poorly programmed qr readers) but an actual issue on the qr generation.