Why these QR codes can't expire
A QR code is just a pattern encoding your text — it needs no service to keep working. Expiring "free" QR codes are a business model: those sites encode a redirect through their own server instead of your actual link, which lets them disable it, charge you, or log every scan. This generator encodes your content directly into the pattern on your device, so the printed code works for as long as your URL does, with no middleman to pay, break, or snoop.
Practical settings
Medium error correction suits most uses. Choose High if the code will be printed small, might get scuffed, or will have a logo placed over the center. Keep strong contrast between code and background colors — dark-on-light scans most reliably. The SVG download scales to any print size with perfectly crisp edges; use the 2048 px PNG for signage if your print shop prefers raster files.