Email clients remove scripts and most CSS, so an animated GIF is the only dependable way to get moving text into a signature. Make one with the email signature GIF maker: keep it around 600 pixels wide and under 200 KB.
Gmail
- Open Settings → See all settings → General → Signature.
- Click the image icon in the signature editor. Gmail only accepts images from a web address or Google Drive, so upload the GIF to Drive first and set it to “Anyone with the link”.
- Pick the GIF, save changes at the bottom of the page, and send yourself a test.
Outlook (new Outlook and Outlook on the web)
- Go to Settings → Accounts → Signatures and create a signature.
- Use the image button to insert the GIF from your computer, then save.
- Some older Outlook versions for Windows show only the first frame. Put the words that must be seen in “Text that stays”, which is visible from the first frame.
Apple Mail
- Open Mail → Settings → Signatures and add a signature.
- Drag the GIF file into the signature box. Untick “Always match my default message font” if the layout shifts.
Before you roll it out
- Send a test to a Gmail, an Outlook and a phone address and check it plays.
- Keep the animation short, about three to six seconds, and let it stop on a readable final line by turning off looping.