Doodle QR

Scanners read only the center of each module. Everything in blue is yours to draw on.

Content

Error correction Size

Bigger sizes have more error correction to spend but smaller modules.

Mask pattern

Changes which dots are black. Try a few for a layout you like.

Dots

Dot size:

35% is a safe default. Smaller gives more room but needs a steady camera.

Dot shape Alignment squares

The small square near the bottom right helps scanners correct for a tilted camera. Phones read it fine as dots; switch to big dots or solid if a scanner struggles.

Free zones (spend error correction)

Spend of the error budget

The rest is kept as margin for camera noise and stray pen marks. Above 70% is risky.

Tool (click or drag on the code)

Paint adds or removes one codeword (8 modules) at a time. A block that is out of budget will refuse more.

Export

"With blue" is the doodle guide. "Clean" is only the dots and patterns, for tracing or a lightbox.

Corner squares (keep solid) Draw around the dot Draw anything Keep white

Details

Scan test

Decodes the clean code, then a worst case: every gap scribbled black at random and every free zone filled with noise.