Sort of. The 21x21 QR has an error correction of "L". That means up to 7% of the data area can be obscured. Realistically, as the code is a square, you could on

Sort of. The 21x21 QR has an error correction of "L". That means up to 7% of the data area can be obscured. Realistically, as the code is a square, you could only lose data from the right hand side while maintaining integrity. A QR with "H" error correction can lose about 30% - but the code takes up a lot more pixels.