I use this to generate labels to FarmOS (nursery plants).
Use it as you please, at your own risk. Save, Print, Display...
I use this Open source code: github.com/danielgjackson/qrcodejs
(Higher = More complex, but more resilient to damage).
Text
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Image <img>
Image <svg>
Simpler codes = Scans easier and Quicker:
Keep the input as short as possible.
All-numeric text = most compact. All upper-case alphanumeric (with some symbols allowed) = more compatible (than mixed-case)
Include a written alternative for the URL.
For WiFi QR codes, use the format: WIFI:S:my_ssid;T:WPA;P:my_passphrase;;