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

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

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 ...