Yes. The code is created entirely in your browser — your text or link is never sent to a server.

Yes — download a PNG for quick use, or a crisp SVG that scales to any size without going blurry (ideal for print and large displays).

Yes — pick any foreground and background colors. Keep strong contrast (a dark code on a light background) so scanners read it reliably.

It adds redundancy so the code still scans even if part of it is dirty or covered — for example by a logo. Higher levels are more robust but pack the dots more densely.