Kit — QR code

QR code generator

Links, Wi-Fi credentials, email, SMS and contact cards — built in the page, with control over error correction, size, quiet zone and colour, and exported as PNG (including a print-resolution version) or SVG.

Start URLs with https:// — without a scheme, many scanners treat the code as plain text rather than a link.

Higher levels survive more dirt and wear but pack the same content into a denser grid. Choose H if you plan to place a logo in the middle.

Edge length of the preview and of the 1× PNG.

The blank border around the code. The specification asks for at least 4 modules.

#000000

#FFFFFF

Preview

Enter something above and the code appears here.

What the code actually contains

Nothing here yet

Applies to the PNG. Pick 2× or more for print; the SVG scales without loss regardless.

This runs entirely in your browser. Nothing is uploaded.

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How this one is built

Wi-Fi passwords stay on your machine

Making a Wi-Fi QR code means typing an SSID and its password. On a hosted generator, that pair goes to the host. Here the string is assembled and rendered in the page, so there is nothing to send.

Static codes, no redirect in the middle

The code carries your content directly. No shortener, no tracking hop, so nothing breaks when a third party shuts down — and equally, the destination cannot be changed later.

You can see what is encoded

The exact string going into the code is printed on screen. When a code misbehaves, that is usually the fastest way to find out why.

Choosing the settings

Which error correction level?M (about 15% recoverable) covers screens and ordinary print. Use Q for signage or anything that gets scuffed, and H if a logo will sit in the middle. Higher levels pack the same content into a denser grid, so they also need a little more physical size.
Can the quiet zone be trimmed?The specification asks for at least four modules. That border is how a reader knows where the symbol ends, so trimming it can make the code blend into whatever it is printed on. If a layout forces a narrower one, test on paper before the run.
How big should it be in print?A common rule of thumb is roughly one tenth of the intended scanning distance — about 10 cm across for a one metre read. Reader quality and print accuracy both move that number, so a test print with a real phone is the reliable answer.
Is it safe to change the colours?Yes, as long as the two colours differ in lightness. Readers threshold the image into light and dark rather than looking at hue, so two saturated colours of similar brightness will not scan. This tool computes the contrast ratio and warns when it is too low.

Questions

Can I use these codes commercially?

Nothing here restricts what you do with the image. Note that "QR Code" is a registered trademark of DENSO WAVE, which has stated it does not exercise its patent rights for use following the standard. Whether a trademark notice is required is a question for wherever you are publishing.

Do the codes expire?

No. What you get is a static pattern containing your content, with no server of ours in the loop. Scan it in ten years and the same string comes out.

Can I change the destination later?

Not in the code itself — fixed content is what "static" means. If the destination may change, encode a URL you control and change where that page redirects.

It will not scan. What should I check?

Colour contrast, printed size and quiet zone account for most failures. Try scanning the on-screen preview: if that works, the problem is on the print side; if it does not, it is in the settings. The encoded string shown below the preview is worth a look too.

Is what I type stored anywhere?

No. It lives in the page and is gone when you close the tab. Generation and download both happen in the browser, so Wi-Fi passwords and contact details never reach us.