SWAPQR (https://qr.bnj.app) is a web app for QR codes. Static QR codes are generated entirely in the browser and are free. Dynamic QR codes encode a short redirect URL on qr.bnj.app; the destination can be changed later and the app shows scan statistics. A "photo QR" module dithers a user's photograph into the code, in the browser. Monetization: a Pro subscription (weekly / monthly / yearly with a short free trial) sold via Stripe Checkout; Pro unlocks dynamic codes with editable destinations and scan statistics. No user accounts, no email/password: a purchase issues a licence code (BNJ-XXXXXXXX). No ads.