How this UPI QR code works
This builds a standard UPI payment deep link (upi://pay?pa=...&pn=...) from your UPI ID,
name, and optional amount and note, then encodes that link as a QR code - the same format used by UPI apps
like Google Pay, PhonePe, Paytm, and most Indian banking apps. Scanning it opens the payer's UPI app with your
details pre-filled, ready for them to confirm and pay.
Everything happens in your browser - your UPI ID is only encoded into the QR code shown here, never sent to any server. Leaving the amount blank lets the payer enter whatever amount they want to send.
Why the QR code uses a standard deep-link format rather than something custom
The upi://pay link format is the common standard that every UPI-compatible app already knows
how to interpret - building the QR code around that exact standard is what lets it work consistently across
Google Pay, PhonePe, Paytm, and bank apps alike, rather than needing a separate code for each app.
Why leaving the amount blank changes how the code can be used
A fixed amount is useful for a specific invoice or bill, but a blank amount turns the same code into a general "pay me" QR that works for any transaction size - the difference matters for choosing whether to generate a new code per payment or reuse one printed code indefinitely.
Why double-checking the UPI ID matters more than for most form fields
Because the ID is encoded directly into the payment request with no verification step in between, a typo in the UPI ID produces a QR code that's perfectly functional but points payments at the wrong account or fails outright - there's no built-in way for this tool to know the ID is wrong, so checking it carefully before sharing the code is the one step that actually matters here.