its a trade-off. the point of javascript is you don't have to download an image. i've heard of people inlining base-64 encoded images to avoid an extra request. is 4k javascript worth it to avoid a 2k png download hosted somewhere else? maybe.

Or here: http://safe.mn/tools/#automatic-qr

(Discalimer: from my website)

I love the OP and the concept, but this is so much simpler.

just saying: http://miniqr.com has a (js) api, too. one line is propably possible.