How to create reliable QR codes for links, Wi-Fi, contacts, and more
Helpful guideHow to create reliable QR codes for links, Wi-Fi, contacts, and more
A QR code is really just a compact way to hand someone information through a camera scan instead of typing it in. It can hold a website address, plain text, Wi-Fi details, a contact card, a phone number, a message, a location, a calendar event, or other structured data. The right choice comes down to what you want the person scanning it to do next.
Choosing the right QR type
Use Website or URL when the goal is to open a page. Plain Text works when you just want the scanner to read or copy a short message without visiting a site. Wi-Fi codes save guests from typing a long password by packaging the network name, security type, and password together. Contact or vCard codes hand over structured contact details, while phone and SMS codes set up a common communication action on the scanning phone.
Location codes can carry a map link or raw coordinates. Calendar event data can include the event name, time, location, and description. Custom Data is there for when you already have a specific payload and just want it encoded exactly as given.
Keeping QR codes easy to scan
Strong contrast is the safest design choice available. A dark foreground on a light background gives a phone camera a clean boundary to lock onto. Skip low-contrast combinations, busy backgrounds, or decorations that cover the modules, and leave the quiet margin around the code alone — scanners rely on that empty space to find the edges.
Pick an error-correction level based on how much wear the code might take. Higher correction recovers more missing data but makes the symbol denser. For ordinary digital use, the default middle level is a sensible starting point. If a code is going to be printed, placed outdoors, or partly covered by a logo, test it carefully before you publish it.
Test it before you publish it
I always scan the finished code at the actual size and in the conditions it will be viewed — small on a business card is different from large on a poster. Test with at least one modern phone camera, and more than one if the code matters. Confirm the destination opens correctly, the Wi-Fi details connect, and contact fields look right. A code can be technically valid and still point to the wrong URL or an outdated number.
Static, not dynamic
The codes generated here are static — the information sits directly inside the symbol. Change the URL later, and you need a new code. For printed material that has to last, it helps to point the code at a stable link you control, one you can redirect later without reprinting anything.
Privacy and sensitive information
Do not put secrets into a QR code just because it is convenient. Anyone who scans it can read what is inside. Wi-Fi passwords, private contact details, and confidential notes should only go to people authorized to see them. Generation happens locally in your browser, but privacy still comes down to what you choose to encode and where you publish the final image.
Editorial note: Scanning behavior varies by device, camera app, and encoded format. Scan-test anything important before printing, advertising, or business use.