Crochet QR Code Pattern Generator

Corner-to-corner is the natural fit: every C2C tile is close to square, so one tile per module gives a code with true proportions, worked from a corner on the diagonal. Tiles are big — about 2.5 cm each in worsted — so a 29 × 29 code is a 72 cm square, pillow or baby-blanket size. The C2C pattern generator explains reading a diagonal graph if you have not made one before.

Single crochet is much smaller and sharper: one stitch per module makes the same code about 18 cm wide at 16 stitches per 10 cm. A single crochet stitch is a little shorter than it is wide, so a 1 × 1 code comes out slightly squat; most phones still read it. For a square code, the 6 stitches × 7 rows option turns each module into a block — blanket size. Work it as tapestry crochet and carry the unused color inside the stitches, so there are no floats to catch.

Contrast does most of the work: black and white, or navy and cream, in a smooth yarn. Carried yarn can peek through single crochet, so go down a hook size for a firmer fabric, and keep the dark color on the inside of light stitches when you carry it.

Keep the light border — at least 2 modules, 4 if the piece will hang on a busy background. Scanners locate the code by its three corner squares, so those 7 × 7 blocks must be exact; a stray stitch in the middle is often absorbed by error correction, a wrong corner usually is not.

Crochet is read from the bottom up, and a mirrored QR code will not scan. The written rows under the chart are already in working order, bottom row first and right-side rows read right to left. Block the finished piece flat and test it with a phone camera in daylight.