Google Translate has supported handwriting input for a while now, and today that functionality arrives on two of Mountain View’s biggest products: Gmail and Google Docs. If you’ve played around with this feature in Translate, the format will look quite familiar; once your language input tool has been enabled (see the source link for the step-by-step instructions), select the pen icon from the toolbar in Docs or your email window, and start writing in the panel with the on-screen pen.
As with Translate, the real benefit here is the ability to write several characters at once — especially useful for languages such as Chinese, Hindi and Japanese — and it could definitely speed up composing long emails or papers. Currently, Google Docs supports handwriting input for more than 20 languages, while Gmail can manage over 50. Head to the source link for more info.
Source: Official Gmail Blog