How do I add my email signature to Gmail?
Select your signature and copy it to your clipboard.
Open your Gmail inbox, go to Settings, then find the Signature section.
Paste your copied signature.
Click Save Changes at the bottom of the settings window.
Your signature should now show up in your new emails.
Why might my signature not fit?
Gmail limits signatures to 10,000 characters. You're most likely to hit that limit if:
Your signature has a long disclaimer, or
Your signature uses more than 10 social icons
The underlying HTML code behind your signature is more complex than it looks, so these can add up quickly.
Still hitting the limit? See Why does Gmail say my signature is too long? for specific fixes.