What is a rich text signature?
Before the update, Gmail users were stuck with plain text formatted signatures. This meant that you couldn’t customize any part of the signature except for the text characters that it contained. With rich text signatures you can change the color, size, and font of text. You can also add images, links, and formatting.
If you’re using the latest desktop-browser version of Gmail you can edit and send messages with rich text signatures. Unfortunately there is no support yet for mobile users or the old HTML only versions of Gmail.
How To Add A Rich Text Signature To Gmail Email Messages
Click the Settings link and then Click the General tab.
Half-way down the General settings page you’ll find the Signature area. The new rich text editor will show up right in the settings window and you can fully edit your signature here.
That’s all there is to it! It’s just like writing a mini email that will be included at the foot of every message you send out from Gmail.