How to Change Your Email Signature (Gmail, Outlook, Apple Mail & More)

Your email signature is one of the few pieces of text that goes out with every single message you send. Updating it — whether you're changing jobs, adding a phone number, or just cleaning up an outdated format — is a quick process once you know where to look. The exact steps vary depending on which email client you're using and whether you're on desktop, mobile, or a web browser.

What an Email Signature Actually Is

An email signature is a block of text (and sometimes images or links) that gets automatically appended to the bottom of outgoing emails. Most email clients let you create multiple signatures and assign them to different accounts or message types — for example, one signature for new messages and a shorter one for replies.

Signatures can contain:

• Your name, title, and company
• Phone number and website
• Social media links
• A logo or headshot image
• Legal disclaimers (common in corporate environments)

The format is stored differently depending on the platform — some use plain text, others support HTML formatting, which allows styled fonts, colors, and images.

How to Change Your Email Signature by Platform

Gmail (Web Browser)

1. Open Gmail and click the gear icon (top right) → See all settings
2. Stay on the General tab and scroll down to Signature
3. Select an existing signature to edit, or click Create new
4. Make your changes in the text editor — you can format text, insert links, and add images
5. Scroll to Signature defaults to control which signature appears on new emails vs. replies
6. Click Save Changes at the bottom of the page

Gmail's signature editor supports basic rich text. For more advanced HTML signatures, some users paste pre-built HTML directly, though Gmail's interface can strip or alter complex formatting.

Outlook (Desktop App)

1. Open Outlook and go to File → Options → Mail → Signatures
2. In the Signatures and Stationery window, select a signature to edit or click New
3. Use the editor to modify text, insert images, or add hyperlinks
4. Use the dropdown menus on the right to set default signatures for each email account
5. Click OK to save

Outlook's desktop app offers more formatting control than the web version, including the ability to embed images directly rather than linking to them externally.

Outlook on the Web (Outlook.com or Microsoft 365)

1. Click the gear icon → View all Outlook settings
2. Go to Mail → Compose and reply
3. Edit your signature in the text box provided
4. Toggle on Automatically include my signature if you want it added by default
5. Click Save

Apple Mail (macOS)

1. Open Mail → Settings (or Preferences on older macOS versions) → Signatures
2. Select the email account on the left, then click + to add a new signature or select an existing one to edit
3. Edit the signature in the right-hand panel
4. Drag the signature name under the account name to assign it
5. Use the Choose Signature dropdown to set a default

⚠️ Apple Mail has a known quirk: it may reformat or override custom HTML signatures. If you need precise styling, third-party tools exist specifically for building Apple Mail-compatible signatures.

iPhone / iPad (iOS Mail App)

1. Go to Settings → Mail → Signature
2. Choose All Accounts or Per Account
3. Tap the text field and type your updated signature
4. Changes save automatically

iOS Mail only supports plain text signatures natively. Images and HTML formatting aren't editable through the built-in settings interface.

Android (Gmail App)

1. Open the Gmail app → tap the three-line menu → Settings
2. Select the email account
3. Tap Mobile Signature
4. Edit the text and tap OK

Like iOS, the Gmail mobile app supports plain text only. The richer signature you set up in Gmail on desktop won't carry over automatically to mobile — they're managed separately.

Key Variables That Affect Your Approach 🔧

Not every signature change is the same. Several factors determine how straightforward — or complicated — the process will be:

HTML Signatures vs. Plain Text

Plain text signatures are universal — they display correctly in every email client, on every device. They're the safe default for personal use.

HTML signatures allow branded formatting: custom fonts, colors, logos, social icons, and clickable links styled as buttons. They're common in business contexts but come with tradeoffs:

• Some email clients block remote images by default, so a logo may not display until the recipient clicks "load images"
• HTML can render differently across Gmail, Outlook, Apple Mail, and mobile clients
• Certain security filters flag emails with complex HTML, which can affect deliverability

If you're building a polished HTML signature, most people use a dedicated email signature generator tool and paste the output into their client's signature settings — rather than writing the HTML manually.

When Signatures Don't Update Correctly

A few common issues to be aware of:

• Cached signatures — Some clients don't reflect changes until you compose a new message or restart the app
• Mobile vs. desktop mismatch — Gmail and Outlook treat mobile signatures as entirely separate from desktop settings
• Replies and forwards — Many clients suppress signatures on replies by default; check your signature assignment settings
• Multiple identities or aliases — If you send from multiple addresses within one account, each alias may need its own signature configured independently

The mechanics of changing a signature are straightforward on most platforms. What varies — and what determines which approach actually works for you — is the combination of client, device, account structure, and how much formatting you actually need.