If you Google search "free QR code generator", a number of options will come up. My preference is QRCode Monkey because of their various customization options and the fact that it is always free!
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First things first, just enter the URL you want the QR code to direct to
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You can customize the color for your QR code
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You can also add your logo to your QR code! Just select the logo image, and make sure you select the option to remove background behind logo
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You can then customize the style and shape of your QR code!
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When you're ready, click "Create QR Code" to generate your code and confirm you like how it looks
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Once you're happy, just download your code and you're ready to rock!