1. Copy the signature
In the Outromail editor, click “Copy signature”. The clipboard now holds rich HTML and a plain-text fallback.
2. Open Gmail settings
Gmail, gear icon, “See all settings”, scroll to “Signature”, click “Create new” and name it.
3. Paste
Click in the signature box and paste (Cmd+V or Ctrl+V). You should see the card with images.
4. Set defaults
Under “Signature defaults”, choose the signature for new emails and for replies. Save changes at the bottom.
Images not showing?
Gmail sometimes shows a broken image on first paste; send yourself a test email, it renders there. If not, copy again from Outromail rather than from another email.
Mobile
Gmail on Android and iOS use the signature set on the web for emails sent from the web. The mobile apps have a separate plain-text signature; leave it empty to avoid duplicates.