Irene Okpanachi is a Features writer, covering mobile and PC guides that help you understand your devices. She has five years' experience in the Tech, E-commerce, and Food niches. Particularly, the ...

You can scan a QR code using the camera on your smartphone, tablet, or computer — however, you may need to download an app.

To properly sign a PDF on your Android phone or tablet, you'll need to download an app from the Google Play Store.