Create a QR for your link, WiFi network, WhatsApp or email. It's free, never expires and downloads as PNG or SVG.
No sign-up and nothing uploaded to a server: everything happens in your browser. See for yourself.
No. They're static and work forever because they don't go through any server.
Choose "Maximum" error correction and place the logo in the center, covering less than 25% of the code; test that it scans before printing.
No. The code is generated in your browser; neither the text nor the WiFi password is sent to the internet.
The QR codes this tool generates are static: the content is inside the code itself, so they never expire and don't depend on any service.
With the WiFi type, anyone who scans the code connects to your network without typing the password. With WhatsApp, it opens a chat with you with an optional message already written.
Aim for good contrast between the code and the background (dark on light) and leave the white margin; if you're going to print it, use SVG or the 2048 px size.