Use your in-camera HDR
Some modern cameras will stitch your bracketed images together for you, eliminating the need for a computer. This generally works well, although you don’t have as much control over the final look of your shot. Importantly, in-camera HDR only works when shooting in JPEG, and only produces a JPEG file, so your editing options are slightly limited should you want to tweak it further. When you don’t have access to a computer, though, this is a very handy tool.