How to Add an Animated GIF to Your Email Signature (Gmail, Outlook, Apple Mail)

To add an animated GIF to your email signature, open your mail app's signature settings, insert the GIF like any other image, and save. In Gmail that's Settings, See all settings, Signature. Then send yourself a test, because each app treats GIFs differently and a signature can look fine in the editor and wrong in the inbox.

Here's what to do before you start, the steps for each app, and what we could and couldn't verify as of October 2026.

Get the file right first

Three things save you from redoing this later.

Keep it small

Litmus suggests under 1 MB for GIFs in email, because that's what loads quickly on a phone. Exclaimer goes further and suggests under 500 KB. These are conventions about load time, so there's no exact right number.

Make the first frame work alone

Some versions of Outlook show only the first frame. If frame one is a blank fade-in, those readers see nothing. Start on a finished picture with your message on it.

Check the height

Google's help page recommends signature images of 70 to 100 pixels high by 300 to 400 wide, and states a maximum of 100 high by 1000 wide. Plenty of signature cards are taller than that, and Google doesn't say what happens to them. We're testing this ourselves and haven't finished, so if you go taller, look closely at your own test email.

Gmail on a computer

1. Open Gmail, select the gear icon, then See all settings.
2. Stay on the General tab and scroll to the Signature section. Google's steps start here.
3. Select Create new, name it, then add your GIF with the image button or paste a signature you've copied.
4. Scroll to the bottom of the page and select Save Changes. It's easy to miss, and the signature is lost without it.

Gmail allows up to 10,000 characters in a signature, and images count towards that. If you get an error about length, the image may be embedded in the signature's code instead of hosted. A hosted image, one that lives at a web address, avoids this.

The Gmail phone apps have their own mobile signature, which Google describes as text. If you don't create one, new messages use the signature from your computer. So set it up on a computer and leave the phone setting empty.

The new Outlook and Outlook on the web

1. Open Settings, then Accounts, then Signatures. Microsoft's steps are the same for both.
2. Select Add signature and name it.
3. Insert or paste your GIF and details, then save.
4. Choose it as the default for new messages and replies if you want it there automatically.

We found no official Microsoft statement on GIFs in new Outlook signatures. Users on Microsoft's forum reported problems in 2024, and one said a narrower GIF fixed it, while some vendors say it plays. Test it on your own account.

The classic Outlook app on Windows

1. Open a new message.
2. On the Message menu, select Signature, then Signatures.
3. Select New, name it, add your GIF and details, then OK.

Sources disagree on what your reader sees. Microsoft says Outlook 2021, 2024 and Microsoft 365 play animations by default unless animations are turned off in Windows, though that page is about the message body and doesn't mention signatures. Email on Acid reports first-frame-only behaviour through Outlook 2016, and a single play in 2019. Exclaimer says signatures in classic Outlook are "less predictable" and that inserting the file is safer than copy and paste.

The practical answer is the same either way: assume some of your readers get the first frame.

Outlook for Mac

1. On the Outlook menu, select Settings.
2. Under Mail, select Signatures. Microsoft's Mac steps continue from here.
3. Add a signature, name it, add your GIF and details, then close the window.

Apple Mail on a Mac

1. Choose Mail, then Settings, then Signatures. Apple's guide covers each step.
2. Select your account and use the Add button.
3. Name the signature, then drag the image into the preview area or paste your signature there.

iPhone and iPad

Apple's iPhone guide is direct: "You can only use text in your Mail signatures." You'll find guides describing copy-and-paste workarounds, but Apple doesn't support them. Set up your animated signature on a computer, and accept that mail sent from your iPhone's Mail app may use a plain one.

This is about sending. Reading is different: caniemail lists GIFs as supported in Apple Mail on iOS, based on an older version.

What each app does with a GIF

Keep in mind that caniemail tests GIFs in email generally, and a signature passes through each app's own editor first. That's another reason to send yourself a test.

Test it before your clients see it

Send one email to yourself and check four things:

1. Does it move? Open it in the app you send from, then on your phone.
2. Is it the right size? Look for stretching, cropping or a card that overflows on a phone screen.
3. Is the first frame enough? Pause on it. Would someone understand it if it never moved?
4. Does the link work? Tap the image and your details.

If you can, send one to a Gmail account and one to an Outlook account, and check that both land in the inbox. We found no good study tying signature GIFs to spam folders in either direction: Google's sender guidelines don't mention images or file size, and the most direct test we found, Email on Acid's from 2014, saw no effect from image size. Your own test still beats anyone's general advice.

Replies and threads

A signature card on every reply in a long thread gets repetitive. Most apps let you set a different signature for replies, so keep the card on new messages and use your plain details on replies.

If you don't have a GIF yet

You can design one in Canva or use a tool that builds it for you. Our comparison of animated signature generators lays out the options, and DocsAura's signature page shows cards made from a website, where you can join early access.