The Chrome browser has its own built in QR creator.
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Navigate to the url you want to share, select the "share" icon in the main navigation bar, then select the option to create a QR Code. Then simply download the image and you've got your QR Code.
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If you don't use Google Chrome as a browser then there are free QR code generators available that you can use to create a code with your desired URL, just use a search engine to find one that will work for you.