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Limit for data?
I tried to generate a QR Code with around 144 strings, each consisting of 20 alphanumeric characters. Unfortunately this fails (downloaded PNG file is completely white). Is there a limit somewhere in the code? The German Wikipedia states that up to 4096 alphanumeric characters are possible in a QR Code, so my 2880 characters should work.
Have you tried changing the error correction level for your use case? The longer your data, the lower you have to set the error correction level. Here's a good explanation I found about how the qr code size relates to the data length https://github.com/kozakdenys/qr-code-styling/issues/104#issuecomment-1771854501
Yes, error correction level is already at L. Which version of the QR code is used in mini-qr (https://www.qrcode.com/en/about/version.html)? Seems like a version lower than 33 is used, because from version 32 on downwards only 2840 or less alphanumeric characters are allowed. Ideally version 40 shouldbe used for maximum characters.