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For the reverse (computer -> phone) I use a browser extension called "The QR Code Extension." Click it and it displays a QR code to the current URL you just point your phone's camera at.

https://chrome.google.com/webstore/detail/the-qr-code-extens...

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Chrome has this built in; I don't use an extension. There's a "Share" icon on the right side of the URL bar, with "Copy link", "Send to your devices", "Create QR code", "Cast", and "Save page as...".

You create a QR code, it's displayed, along with its URL, and you can "Copy" or "Download" it.

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