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QR Code stands for "Quick Response Code". It is a type of two-dimensional barcode invented in 1994 by the Japanese automotive company Denso Wave.
Unlike traditional barcodes found on grocery items that store data horizontally (1D), QR codes store data both horizontally and vertically (2D). This allows them to hold significantly more information—up to 4,296 alphanumeric characters compared to the 20 or so in a standard barcode.
Why they are popular: They can be scanned instantly by any smartphone camera without needing special equipment, acting as a physical-to-digital bridge.
A QR code consists of black squares arranged in a square grid on a white background. Here is a breakdown of its structure:
Error Correction: One of the most powerful features is Reed-Solomon error correction. A QR code can still be scanned even if up to 30% of it is damaged or covered. This allows for branding (like logos) to be placed in the center without breaking the code.
Replaced physical menus for hygiene and easy price updates.
Scan to connect to Wi-Fi without typing complex passwords.
vCard QRs instantly save contact details to a phone.
On billboards or flyers to direct traffic to a landing page.
When using a generator, it is important to know the difference:
The data is directly encoded into the pattern. Once generated, it cannot be changed. If you mistype the URL, you must reprint the code. However, they are free, last forever, and require no subscription.
The code contains a short redirect URL (e.g., qr.co/abc). This redirects to your destination. You can change the destination URL anytime without changing the QR image. These normally require a paid service.
No. The QR codes generated here are static. They contain the data directly and will work forever as long as the image is legible.
This free tool generates standard codes. However, since QR codes have error correction, you can technically overlay a small logo in the center using image editing software like Photoshop.
Ensure there is enough contrast (dark code on light background is best). Also, ensure the code isn't too dense; shorter URLs create simpler, easier-to-scan codes.
