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.

You can digitally sign a PDF in several different ways, including Adobe Acrobat, Apple's Preview app, and mobile apps, among other options.

Have you ever found yourself frantically scribbling down notes from a meeting, struggling to copy a recipe from a magazine, or trying to preserve the details of a handwritten letter? These moments can ...