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by Karliss 814 days ago
Most compact QR encoding capable of representing hex symbols is alphanumeric mode which requires 5.5 bits per character. Which means the output will be 5.5/4 = 1.375 times longer than encoded binary data or 37.5% overhead. That's even worse than 8/6 =1.33 you get for doing base64 encoding on top of byte mode.