Choose what the code should do, adjust the style and download it.
Beyond plain text and links, the generator builds the special formats that phones understand. Wi-Fi codes join a network when scanned, email codes open a pre-filled message, phone codes start a call, and SMS codes prepare a text.
Error correction lets a code still scan when part of it is damaged or covered, at the cost of a denser pattern. Medium is a good default and high suits codes with a logo placed on top. Download PNG for web and documents, or SVG for print, where it can scale without blurring.
No. The code contains the data directly rather than pointing to a service, so it works forever. The flip side is that you cannot change the destination later.
At least two centimeters square, with a clear margin around it. Larger is better for scanning from a distance, roughly one tenth of the scanning distance.
There is too much data for one code at the chosen error correction. Shorten the text or lower the error correction level.