What is a QR code and how do you make one?
A QR code (Quick Response code) is a two-dimensional barcode that can be scanned by any smartphone camera. It stores text, URLs, Wi-Fi details or contact information and turns them into an instant action for the person scanning it.
How does a QR code work?
A QR code stores data as black squares on a white background, arranged in a grid. Three large squares in the corners help the camera find and orient the code; everything else encodes the actual payload. Because scanning happens client-side, no data has to travel anywhere — the phone reads the pattern locally.
- URLs: open a website or landing page.
- Wi-Fi: connect to a network with one tap.
- Payments: start a payment link or program.
- Products: show a menu, manual or campaign page.
How to generate a QR code with FreetoolsY
Open the QR Code Generator and type or paste the text, link or serial number you want to encode. Pick a size and the colors you like, then download the QR code as a PNG image and drop it into a poster, menu, business card or email signature.
- Test the code with a real phone camera before printing.
- Use a solid, dark-on-light contrast for reliable scanning.
- Keep a buffer zone around the code — do not cover it with artwork.
Best practices for QR codes
Run a quick error check before you print: a few wrong modules can make the whole code unreadable. If your target is a URL, point the code to a short redirect you can change later, so you do not have to reprint when the link updates.