Does making a QR code require sending the text to a server?
No. QR encoding can run in JavaScript in the browser and draw the finished symbol locally. The text, URL, email or Wi-Fi details do not need to be sent to the public guide. Anyone who later scans the QR code can read the encoded payload, so confidential information should not be placed in a public code.
How to use the tool
Choose the payload type
Select link, Wi-Fi, email or plain text and enter only the information you intend to share.
Generate the symbol
The browser encodes the payload and creates a downloadable PNG.
Scan-test before publishing
Test the saved image with more than one device and confirm the exact destination or Wi-Fi details.
At a glance
- Generation
- In browser
- Common payloads
- URL, text, Wi-Fi and email
- Privacy after sharing
- The payload is readable by scanners
- Required final check
- Scan the exported or printed code
Make a QR code easy to scan
Keep a clear quiet zone around the symbol, use strong dark-on-light contrast and avoid stretching the image. A very long payload creates a denser grid, which can require a larger printed size or a closer camera.
For a web address, include the complete HTTPS URL and open it yourself before generating the code. A QR code does not certify that a destination is trustworthy; it only encodes characters.
- Do not crop the white margin tightly.
- Avoid placing the code over a patterned background.
- Test at the final physical print size.
- Re-test whenever the destination or Wi-Fi password changes.
Security and shared secrets
A Wi-Fi QR code contains the network name and usually its password in machine-readable text. Share it with the same care as the written password. A public poster, social post or photograph of that code can disclose access details.
People should preview a scanned URL before opening it. Printed codes can be covered by malicious replacement stickers, so organisations should inspect physical signs regularly.
Important limitations
- A generated QR code does not validate or shorten its destination.
- Dense codes may be unreliable when printed too small or displayed with low contrast.
- Wi-Fi passwords and other secrets remain readable to anyone with the code.
- Printer scaling, cropping and glossy surfaces can reduce scan reliability.
Questions people ask
Will the QR code expire?
The image itself does not expire. A linked website, email address, Wi-Fi password or other destination can change or stop working.
Can I put a logo over the code?
That can cover data modules and reduce reliability. This tool prioritises a clean symbol; always test any altered design.
Is a QR code encrypted?
No. Standard QR payloads are encoded for machine reading, not encrypted for secrecy.
Primary and project sources
- ISO/IEC 18004:2015 — ISOQR Code symbology specification record.
- node-qrcode project — node-qrcode maintainersPrimary documentation for the QR encoder used by the private workspace.
- QR Code security guidance — UK National Cyber Security CentrePublic-sector guidance on evaluating QR-code risks.