A QR code for your link in bio.

Yes. It runs in your browser, needs no account, and the codes do not expire.

No. The code holds your link directly, so it works as long as the link works. There is no redirect in between.

Not the code itself. Point it at a page you control, like your pageo page, and change the links on that page instead.

No. The code uses the highest error correction level, so it still scans with the mark in the middle. Turn the mark off if you prefer a plain code.