Scan QR Code From Screenshot

Take the screenshot as usual, then select that image file here. It is decoded on your device and the contents are shown as text. You never need a second phone to point at the screen.

Because of scale. A QR code shown inside an app or a web page is often only 100–200 pixels across, and a full-screen capture keeps it at that size while surrounding it with unrelated pixels. Photos of printed codes are usually captured much larger. Cropping the screenshot down to the code itself is the single most effective fix.

Yes, and it helps more than anything you can do afterwards. Zoom into the page or pinch-zoom the app until the code fills as much of the screen as possible, then capture. Enlarging before the screenshot adds real pixels; enlarging afterwards only stretches the ones you already have.

That is exactly what this page is for. Screenshot the code, then open this page and select the screenshot. A camera cannot photograph the screen it is part of, so a screenshot is the standard way around it.

No. The file is read locally by your browser and decoded there. Nothing is transmitted or stored, which matters here because screenshots often contain unrelated personal information around the code.

It can. Some apps render QR codes inverted in dark mode — white modules on a dark background. That is still a valid code and usually decodes fine, but if it does not, switching the app to light mode and re-capturing gives the decoder the conventional dark-on-light arrangement.