I built LogoQR, a completely free tool that embeds logo or custom image directly into the QR matrix itself. Let's stop using the ugly black-and-white QR codes from now!
That is super cool - if passing a logo, do you recommend a simple black and white image? I tried some emojis (basically yellow and black) but they didn't show up as well as your default settings.
Thanks! For logo I'd prefer a colored logo than black/white, however you could try to change the dot colors to grey while using with black/white logo. Emojis can be tricky because they often have subtle gradients or low contrast against the QR patterns, I'm gonna look at those cases right now!