The sample is the address https://wipmob.com/qr/. The code stores the UTF-8 bytes of the text, at correction level M, from version 1 through version 10. A short link or a sentence fits. Above 200 bytes, the page asks for shorter text.
The white margin is part of scanning. If a camera does not read it, zoom the page or raise the screen brightness. The drawing is built for this request and is not stored.
Questions
Does the QR code open by itself?
A phone camera reads the text. When the text is a URL, the phone offers to open it.
Can I use an emoji?
Yes, while the UTF-8 bytes fit in 200. One emoji uses 4 bytes.
Which error correction?
Level M, about 15% of the symbol. There is no logo in the middle.
Does a print work?
Yes, if the square and the white margin are printed without cropping.