A client-side QR code generator. No backend, no tracking, no nonsense. Everything happens in your browser.
Generates QR codes for eleven data types:
- Text / URL — plain text or links
- WiFi — SSID, password, security type, hidden flag
- Email — recipient, subject, body (mailto)
- Phone — dial link (tel)
- SMS — number + pre-filled message
- vCard — name, phone, email, org, title, URL
- Location — latitude/longitude (geo)
- Bitcoin — BIP21 payment URI with address, amount, label, message
- SEPA Payment — GiroCode (EPC v002), EPC v001 (legacy), BezahlCode (legacy). IBAN/amount validation, live byte counter, structured/unstructured reference toggle
- PayPal — PayPal.me (username-based) and PayPal Email (legacy). 24 currencies with locale-based sorting, 0-decimal currency handling (JPY/HUF/TWD), URL length counter with auto ECL adjustment
- Calendar Event — iCal/VEVENT with title, start/end, location, description
Output is configurable: cell size (1x-16x), error correction (L/M/Q/H), and margin (0-4 units).
Installable as a standalone app. Works offline after first visit.
Share Target: Share text, URLs, or .vcf files from other apps directly into the generator. Content type is auto-detected and the correct form is pre-filled.
Update mechanism: Stale-while-revalidate caching. The service worker serves cached files instantly, then fetches fresh versions in the background. If any file changed, a toast notification prompts the user to reload. No version bumping or build step required.
Generate QR codes via GET parameters — no UI interaction needed. Append parameters to https://gottz.de/qr/.
| Parameter | Values | Default |
|---|---|---|
type |
text, wifi, email, phone, sms, vcard, geo, bitcoin, sepa, paypal, event |
(required) |
size |
1, 4, 8, 12, 16 |
8 |
error |
L, M, Q, H |
L |
outline |
0, 1, 2, 4 |
1 |
plain |
(flag, presence is enough) | off |
| Type | Parameters |
|---|---|
text |
content |
wifi |
ssid, password, security (WPA/WEP/nopass), hidden (true/false) |
email |
to, subject, body |
phone |
number |
sms |
number, message |
vcard |
firstname, lastname, phone, email, org, title, url |
geo |
lat, lon |
bitcoin |
address, amount, label, message |
sepa |
name, iban, amount, bic, reference, format (epc002/epc001/bezahlcode), reftype (unstructured/structured) |
paypal |
recipient, amount, currency (ISO 4217), description (email only), format (paypalme/paypalemail) |
event |
title, start, end, location, description |
start/end use datetime-local format: YYYY-MM-DDTHH:mm.
Add &plain to get a fullscreen QR code with no UI — useful for embedding or kiosk displays.
# Simple text
https://gottz.de/qr/?type=text&content=Hello+World
# WiFi with all options
https://gottz.de/qr/?type=wifi&ssid=MyNetwork&password=secret&security=WPA
# SEPA GiroCode (EPC v002), plain display
https://gottz.de/qr/?type=sepa&name=Max+Mustermann&iban=DE89370400440532013000&amount=42.00&reference=Invoice+2025-001&plain
# SEPA with structured reference and BezahlCode format
https://gottz.de/qr/?type=sepa&name=Max+Mustermann&iban=DE89370400440532013000&amount=42.00&format=bezahlcode
# PayPal.me with amount and currency
https://gottz.de/qr/?type=paypal&recipient=YourUsername&amount=25.00¤cy=EUR
# PayPal Email (legacy) with description
https://gottz.de/qr/?type=paypal&format=paypalemail&recipient=shop@example.com&amount=15.00¤cy=USD&description=Invoice+2025-001
# Calendar event
https://gottz.de/qr/?type=event&title=Meeting&start=2025-03-15T14:00&end=2025-03-15T15:00&location=Room+42
100% client-side. No server requests for QR generation, no analytics, no cookies. The QR library runs locally — your data never leaves the device.
Zero build tools. Four source files, two libraries, one HTML entry point.
index.html Entry point
script.js App logic, custom dropdown, share target handling
style.css Neumorphic theming, dark/light mode, responsive
sw.js Service worker (stale-while-revalidate + update toast)
manifest.json PWA manifest with share_target
ce.js DOM creation helper (by GottZ)
qrcode.js QR generation library (by Kazuhiko Arase)
icons/ PWA icons (192/512, standard + maskable)
Serve with any static file server. No transpilation, no bundling.
- Custom dropdown with full ARIA combobox pattern
- Keyboard navigation (arrows, Enter, Escape, Home/End)
- Screen reader live region for generation status
- Focus indicators, reduced-motion support
- WCAG 2.1 compliant
QR Generator by GottZ — MIT License
Built with Claude Code. Libraries: qrcode.js by Kazuhiko Arase (MIT), ce.js by GottZ (MIT).