Go to Gmail Settings โ See all settings โ General tab โ scroll to 'Signature'. Click '+ Create new', then paste the copied HTML signature.
How do I add this to Outlook?
Outlook desktop: File โ Options โ Mail โ Signatures โ New โ paste. Outlook web: Settings โ Compose and reply โ paste under Email signature.
Will images work in email signatures?
Base64 images may not display in all email clients. For best results, host your photo online. Most modern clients support base64.