A website link
A poster needs a code that opens the project page.
- Enter https://1123.net
- Size 512 px, margin 4, level M
- Download SVG for print
The SVG scales without blur, while the PNG is convenient for slides and social posts.
QR Code Generator
This QR code generator turns a URL or short text into a scannable square code. It runs in your browser, renders a crisp preview, and exports PNG for screens or SVG for print.
Your data is processed locally in your browser and is not uploaded to our server.
Use dark modules on a light background and keep a clear margin for reliable scanning.
How to use this tool
- 1 Enter the URL or text you want the QR code to contain.
- 2 Choose a size, margin and error-correction level; the preview updates as you type.
- 3 Pick high-contrast colours so scanners can read the code reliably.
- 4 Download the PNG for screens or the SVG for print and design work.
Formula and calculation logic
Error correction
L ≈ 7%, M ≈ 15%, Q ≈ 25%, H ≈ 30% recovery
Higher levels survive more damage or obstruction but need more modules for the same data. M is a good default; use H when the code will be printed small or partly covered.
Quiet zone
Margin modules around the code
Scanners need a clear border. The margin setting adds empty modules on every side; four modules is a common minimum for print.
Worked example
Short text
A code should show a Wi-Fi password note or a short message.
- Enter the text
- Choose level L for maximum capacity
- Download PNG
Short text produces fewer modules and scans faster; keep the text brief for reliable scanning.
Edge cases and accuracy
Low contrast
Light modules on a dark background can work, but many scanners expect dark foreground and light background. Keep strong contrast and test with a real device.
Too much data
QR codes have a finite capacity. Very long text can exceed it; use a short URL or a link to the longer content instead.
Print size
A QR code that is too small cannot be scanned from a distance. For print, keep at least 2–3 cm and export SVG to avoid resampling blur.
Frequently asked questions
Is the QR code static? + −
Yes. The code encodes the text directly; no redirect service is involved. Changing the text requires generating a new code.
Which download format should I use? + −
PNG is best for screens, chat and slides. SVG is vector and stays sharp at any print size.
Why does my code not scan? + −
Check contrast, size and the quiet zone. Very small prints, glossy surfaces or low error correction make scanning harder.
Can I use custom colours? + −
Yes, but keep the foreground much darker than the background. Inverted or low-contrast codes may fail on some scanners.
Is my text uploaded? + −
No. The QR code is generated in your browser; the text is never sent to a server.