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

Free software on your phone or tablet lets you scan, create, edit, annotate and even sign digitized documents on the go.

Turn your smartphone into a professional car diagnostic tool with a $15-30 OBD2 adapter and free apps that read engine codes in seconds.

These days, it's pretty easy to digitally sign important documents, but sometimes you just need to sign a physical piece of paper and scan it to send over email. When you just have to put your ...