CyberChef also generates QR codes (and does a million other things), in your browser without any trickery. And it takes input via URL param, which can be quite convenient.
posted by ssg at 9:22 AM on May 24 [9 favorites]

You can do this on your own Mac or Linux box too with qrencode. Here's the homebrew formula.
posted by vacapinta at 9:31 AM on May 24 [5 favorites]

Neat. Doesn't include the border around the image that really should be there. Also relies on an external library (qrious - npm) which might go away/get compromised.

Next time you have guests who need to use the wifi (and you haven't found the 'share' link on your phone or want something a bit more permanent), drop this into justaqrcode:

WIFI:T:WPA;S:mynetwork;P:mypass;;

with the appropriate edits (details: Wi-Fi Network config (Android, iOS 11+)) and they won't have to bug you for wifi deets.
posted by scruss at 9:34 AM on May 24 [4 favorites]

Wow. WOW. How did I not know about CyberChef? That is magical.
posted by phooky at 10:44 AM on May 24

(Also, personal plea: hey, if you're going to use a QR code, and honestly you often shouldn't, please make sure you also have a human-readable version of the information or URL contained therein below it. It's not hard, people. Signed: my burning hatred for the local store that has a sign on the door that says "STORE HOURS:" followed by a QR code. No, not kidding.)
posted by phooky at 10:47 AM on May 24 [13 favorites]

There's also pure JS WiFi QR Code Generator to generate handy printouts you can use to connect devices to WiFi.
posted by qxntpqbbbqxl at 11:43 AM on May 24 [1 favorite]

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