How to use it
Pick the content type, fill in the fields and the code appears immediately. Download it as PNG for documents and social media or SVG for print (it scales to any size without blurring). Point your phone camera at the code on screen to test it before you print.
Wi-Fi codes let guests join your network without typing the password; the code contains the password in plain text, so share it only with people you would give the password to. Error correction lets a code survive damage or a logo on top: L restores up to 7% of the code, H up to 30%, but higher levels make the code denser.
These are static codes: the content is stored in the pattern itself, so they never expire and nobody tracks the scans. Keep a dark code on a light background with good contrast; some scanners cannot read inverted codes.