We use Print Templates to print out information with equipment we ship. Part of the documentation is a pretty long URL. I’d also like show the URL as a QR code to simplify things.
We use the hosted version. Is there a way to read my field and show it as a QR code on the template for printing?
IE — {{ doc.url }} — becomes QRcode(doc.url) — somehow?
I found an easy solution for this issue
there is a barcode website that returns the QR code of the passed data
You can use this URL for example to print the QR code of Test word
So in your case, you can use this in HTML code
<img src="https://barcode.tec-it.com/barcode.ashx?data={{ doc.url }}&code=QRCode" >
P.S. you can visit barcode.tec-it.com website and select the suitable code for you
This is awesome and perfect. It’s exactly what I needed and worked flawlessly. Thank you! 
{{doc.url }} returns an error that the model doesnt exists. can you please help out ?
if i want to put a qr of sales invoice on the print format … so once we scan the qr, it must redirect to the sales invoice doc
Getting Print-view url (authenticated):
{{frappe.get_url()}}/{{doc.doctype}}/{{doc.name}}
Getting Print-view url (guests):
{{frappe.get_url()}}/{{doc.doctype}}/{{doc.name}}?key={{frappe.get_doc(doc.doctype, doc.name).get_signature()}}
and you need to enable this for guest links to work:
Using either jinja blocks above in your print format as the src of <img>
Similar to:
Yamen…! Thanks a lot… !
Its working perfect