Tutorial to Create a Gmail signature An email signature is text, like your contact information or a favorite quote, that’s automatically added at the end of Gmail messages as a footer. Add or change a signature You can put up to 10,000 characters in your signature. 1. Open Gmail . 2. In the top right, click Settings Settings . 3. In the "Signature" section, add your signature text in the box. If you want, you can format your message by adding an image or changing the text style. 4. At the bottom of the page, click Save Changes . Add a signature if you're using the "Send mail as" feature If you use the "Send mail as" feature to send from different addresses in your account, you can add a different signature for each address. To select an address, use the drop-down menu above the signature text box on the Settings page. If you don’t see the drop-down menu: 1. Open the Accounts and Import setting