The fine print:  This is what happens when the error correction built into QR codes lets you hide little bitmap sprites. Usage: 1) Write in the field at the top. 2) Draw a sprite by toggling at least 3 pixels on the left. It will be cropped, mark the corners to guard some blank space. 3) Click "new" and a QR code is created on the right. 4) Add the current sprite by clicking "+1" or the image itself. 5) Undo by clicking "-1". 6) Right-click/long-press the image to save it. For any "+1" you can change the sprite. It will stop when it can no longer decode, but your phone may not do quite so well. You can start over by changing the text or clicking "new". Context: This idea comes from Matt Parker on "A Problem Squared" episode 135. The name comes from Bec Hill quoting The Simpsons on the same episode. Cookies: When you click "new" or "add", the site has your browser store your design in a session cookie. You can delete it at any time by clicking this link or simply closing/reloading the site. Code: Found a bug? Have a suggestion? I appreciate your report or pull request.