Start by Building the Signature Itself
Before you can add anything to Outlook, you need a signature worth adding. The quickest route is TooStamply's free email signature generator, which produces clean HTML that's compatible with every current version of Outlook — desktop, web, and mobile. Fill in your details, pick one of the six templates, set your colors, add a photo or logo if you want one, and copy the result. There's no signup and no watermark in 2026. Once it's on your clipboard, you're ready to learn how to create an email signature in Outlook and set it as your default.
How to Add an Email Signature in Outlook Desktop (Windows)
This is the classic desktop app most people mean when they ask how to set up an email signature on Outlook.
- Open Outlook.
- Go to File → Options → Mail → Signatures.
- Click New and give your signature a name (for example, "Main").
- Click into the editing box, then paste with Ctrl+V. Your formatted signature appears.
- On the right, set this signature as the default for New messages and, if you like, for Replies/forwards.
- Click OK.
Send yourself a test email to confirm it looks right before you rely on it.
How to Add a Signature in New Outlook and Outlook on the Web
The new Outlook for Windows and Outlook on the web (Microsoft 365) share the same settings screen.
- Click the gear icon, then View all Outlook settings if needed.
- Go to Mail → Compose and reply.
- Click into the signature box and paste your signature.
- Toggle Automatically include my signature for new messages and for replies/forwards.
- Click Save.
How to Set Up an Email Signature on Outlook Mobile
- Open the Outlook app.
- Tap your profile icon, then the gear/Settings icon.
- Under Mail, tap Signature.
- Replace the default text with your signature.
- Tap the checkmark to save.
A quick note: Outlook mobile has limited HTML support, so a simple, single-column signature holds up best there. If your desktop signature is elaborate, consider a stripped-down version for mobile.
How to Update or Change Your Email Signature in Outlook
Knowing how to update an email signature in Outlook is the same as adding one — you're just replacing what's there. When your title, phone number, or company changes:
- Rebuild the signature in the email signature generator with the new details.
- Copy the fresh version.
- Return to Signatures (desktop) or Compose and reply (web).
- Select the existing signature, clear it, and paste the new one.
- Save.
That's the whole email signature change in Outlook — no need to delete and recreate from scratch unless you're switching templates entirely.
Troubleshooting Common Outlook Signature Problems
| Problem | Likely cause | Fix |
|---|---|---|
| Signature looks like plain text | Pasted as text, not HTML | Use Ctrl+V, not Ctrl+Shift+V |
| Images don't appear | Outlook blocks external images | Recipient clicks "Download images" or adds you as a safe sender |
| Signature too wide on mobile | Width over 600px | TooStamply signatures are already capped at 600px |
| Extra blank lines | Editor added spacing | Delete stray lines directly in the signature box |
Signature Looks Wrong After Pasting
Make sure you pasted the HTML version rather than plain text. In most versions of Outlook, a normal Ctrl+V keeps the formatting; Ctrl+Shift+V strips it.
Images Not Showing
Outlook blocks external images by default as a privacy measure. The recipient needs to click "Download images," or add you to their safe senders list. This is expected behavior, not a broken signature.
Related Guides
- Free email signature generator — create your signature before adding it to Outlook.
- Professional email signature examples — templates for every role.
- How to add a signature in Gmail — the Gmail equivalent of this guide.
- How to add a signature in Apple Mail — for macOS users.
- Email signature design best practices — size, fonts, and mobile compatibility.
Frequently Asked Questions
How do I create an email signature in Outlook without any coding?
Build it in the TooStamply generator, copy it, and paste it into Outlook's signature settings. You never touch HTML — the tool writes clean, Outlook-compatible code for you.
How do I set my signature to appear automatically on every email?
In desktop Outlook, choose your signature as the default for New messages under File → Options → Mail → Signatures. On the web, toggle "Automatically include my signature" under Compose and reply.
Why does my Outlook signature look different from the preview?
Outlook renders HTML more conservatively than a browser, and it blocks external images until the recipient allows them. Stick to a simple layout, and the signature will look consistent.
Can I have a different signature for replies?
Yes. In desktop Outlook you can assign one signature to new messages and a different (often shorter) one to replies and forwards.
How do I update my Outlook signature after a job change?
Rebuild it in the generator with your new details, copy it, select your existing signature in Outlook, clear it, and paste the new version. Save and you're done.
Get your signature ready first — open the free email signature generator, then follow the steps above to add it to Outlook in a couple of minutes.