How to Change Your Signature in Outlook (Desktop, Web & Mobile)

Your email signature is one of the first things recipients notice — and one of the easiest things to get wrong. Whether you're updating contact details, rebranding your professional image, or finally setting one up for the first time, Outlook gives you several ways to manage signatures. The catch: which method you use depends on the version of Outlook you're running, and they don't all work the same way.

Why Outlook Signatures Work Differently Across Versions

Microsoft offers Outlook across multiple platforms — classic desktop Outlook (part of Microsoft 365 or standalone Office), new Outlook for Windows, Outlook on the web (OWA), and the Outlook mobile app for iOS and Android. Each manages signatures through a different interface, and changes made in one don't automatically carry over to another.

This is a common source of confusion: you update your signature on your laptop, then send an email from your phone and notice the old one is still there. That's expected behavior — signatures are stored locally or per-platform, not universally synced across all your devices.

How to Change Your Signature in Classic Outlook (Windows Desktop)

This is the version most office workers are familiar with — the full desktop application with the ribbon toolbar.

1. Open Outlook and click File in the top-left corner
2. Select Options, then navigate to Mail
3. Click the Signatures… button
4. In the Signatures and Stationery window, select the signature you want to edit from the list — or click New to create one
5. Edit your signature in the text box at the bottom
6. Use the formatting toolbar to adjust font, size, color, or add an image or hyperlink
7. In the Choose default signature section, set which signature appears on New Messages and Replies/Forwards
8. Click OK to save

✏️ One important detail: you can have multiple signatures saved and assign them differently depending on the email account if you manage more than one inbox through Outlook.

How to Change Your Signature in New Outlook for Windows

Microsoft has been rolling out a redesigned "new Outlook" experience that looks and behaves more like the web version. If you've switched to this interface, the path is slightly different:

1. Click the Settings gear icon in the top-right
2. Select Accounts, then Signatures
3. Choose an existing signature to edit or click New signature
4. Make your changes in the editor and save

The new Outlook editor supports basic HTML-style formatting but may have fewer rich-text options than the classic desktop app depending on your build version.

How to Change Your Signature in Outlook on the Web

If you access Outlook through a browser at outlook.office.com or outlook.com:

1. Click the Settings gear icon (top right)
2. Select View all Outlook settings at the bottom of the panel
3. Go to Mail → Compose and reply
4. Scroll to the Email signature section
5. Edit your signature, then toggle whether it should be automatically added to new messages and/or replies
6. Click Save

Web-based signatures support bold, italic, links, and images, but some advanced HTML formatting may not render consistently depending on the recipient's email client.

How to Change Your Signature in Outlook Mobile (iOS & Android)

The mobile app keeps things simple — almost to a fault:

1. Open the Outlook app and tap your profile picture or initials in the top-left
2. Go to Settings (gear icon at the bottom)
3. Scroll down and tap Signature
4. Edit the text and tap the checkmark or Done to save

📱 Mobile Outlook signatures are plain text only by default. You won't get rich formatting, logos, or clickable links in the same way you would on desktop. If branded signatures matter for your workflow, mobile is the limiting factor in the chain.

Key Variables That Affect Your Setup

The "right" way to handle signatures isn't the same for everyone. A few factors shape the experience significantly:

When Signatures Don't Show Up as Expected 🔍

A few common scenarios worth knowing:

• Replies and forwards: Outlook lets you assign a different signature (or none) to replies vs. new messages. If your signature disappears on replies, check that setting specifically.
• Corporate email systems: If your organization uses Exchange or Microsoft 365 with centrally managed signatures, your IT department may be applying signatures at the server level. In that case, editing your local signature may appear to work, but the server version overrides what recipients see.
• HTML rendering: A signature that looks clean in Outlook may appear broken in Gmail or Apple Mail. This comes down to how different clients interpret inline HTML and CSS — a known interoperability gap across the email ecosystem.

The Part Only You Can Determine

The steps above will get you into the right settings panel for your platform. But how you configure your signature — how many you maintain, which accounts they're tied to, whether you use rich formatting or keep it plain, and how you handle the gap between desktop and mobile — depends entirely on how you use Outlook day to day.

A solo freelancer checking email from their phone needs a very different setup than someone managing client communication from a branded corporate desktop. The variables in your own workflow are the piece this guide can't fill in for you.