Where to find and edit your signature in Outlook

Your email signature lives in Outlook's settings, not in the message itself. The exact path depends on which version you use — the desktop app, the web version, or Outlook on your phone — but all three let you change it without touching a single email draft.

In Outlook desktop (Windows or Mac), go to File > Options (Windows) or Outlook > Preferences (Mac), then select Mail > Signatures. You'll see a list of any signatures you've already created. Click New to make a fresh one, or select an existing signature to edit it. Type or paste your new text directly into the editor box.

In Outlook on the web, click the gear icon in the top right, then Settings > Mail > Compose and reply. Scroll down to Email signature and type your new signature into the box. This version doesn't let you create multiple signatures, so you get one signature that applies to all your outgoing mail.

Key Takeaways

  • Desktop Outlook stores signatures in File > Options > Mail > Signatures (Windows) or Outlook > Preferences > Mail > Signatures (Mac).
  • Outlook on the web has one signature per account, found in Settings > Mail > Compose and reply > Email signature.
  • You can create multiple signatures on desktop and choose which one to use for each email, but the web version uses the same signature for everything.
  • Changes take effect immediately on new emails, but won't appear on messages you've already sent.

Creating multiple signatures for different purposes

Desktop Outlook lets you set up separate signatures for different situations — one for work, one for personal mail, one for a specific project. Each signature is stored independently, and you pick which one to use when you compose a new message.

After you create your first signature, click New again in the Signatures window to add another. Give each one a descriptive name so you can tell them apart: "Work", "Personal", "Client Proposals", whatever makes sense for how you use email. You can also set a default signature that appears automatically in new messages, while keeping others available to switch to on demand.

To use a specific signature on a single email, start composing the message, then look for the signature dropdown in the message body (usually near the bottom). Click it and select the signature you want. This is useful if you normally send from a work account but occasionally need to use your personal signature for that same account.

Adding formatting, images, and contact details to your signature

Outlook's signature editor accepts basic formatting: bold, italic, underline, font changes, and colors. You can also insert a logo or small image by clicking Insert > Picture (in the signature editor window). Keep images small — most people read email on phones now, and a massive logo makes your signature take up half the screen.

For contact information, type it directly into the signature box. A typical format looks like this: your name, title, company name, phone number, and website. You can also add a link by highlighting text and clicking the link icon in the editor toolbar. Don't include your email address in the signature — Outlook already shows that in the message header.

If you use a signature with an image, test it by sending yourself an email and opening it on your phone. Images sometimes fail to load or display at odd sizes depending on the recipient's email client. Plain text signatures are more reliable across all devices and email programs.

Why your signature might not appear on replies and forwards

By default, Outlook adds your signature only to new messages you compose. When you reply to or forward an existing email, the signature doesn't appear automatically — this is intentional, because adding a full signature to every reply in a long conversation clutters the thread.

If you want your signature on replies and forwards too, you can change this in the signature settings. In desktop Outlook, look for the checkbox that says "Automatically include my signature on messages I compose" or similar wording (the exact label varies by version). In Outlook on the web, there's no option to add signatures to replies — they only appear on new messages.

Some people prefer to manually add their signature to replies when they're starting a new topic or closing out a conversation. Others turn on automatic signatures for everything. There's no right answer — it depends on your workplace norms and how you like your email to look.

Syncing your signature across devices

If you use Outlook on your desktop and also check email on your phone or tablet, your signatures don't automatically sync between them. The desktop app and the mobile app store signatures separately.

For Outlook on the web, your signature is the same everywhere you log in from a browser, because it's stored on Microsoft's servers. But the desktop app and mobile app don't pull from that same location.

On iPhone or Android, Outlook has a signature setting in the app's settings menu, but you have to type it in manually — there's no way to import the signature from your desktop. If you use multiple devices, consider keeping your signature simple and typing it once in each place, or just use the web version of Outlook where it syncs automatically.

Troubleshooting signatures that don't show up

If you've created a signature but it's not appearing in your emails, check a few things. First, make sure you've actually set it as your default signature. In desktop Outlook, open the Signatures window again and look for a dropdown that says "Choose default signature for new messages" — your signature needs to be selected there.

Second, check whether you're composing in HTML or plain text mode. Outlook can behave differently depending on which format you're using. If you're in plain text mode, some formatting might not show up, and images won't appear at all. Switch to HTML format (in the message composer, look for Format > HTML) if you want full signature support.

Third, if you're using Outlook on the web and your signature disappeared, it may have been cleared by a browser update or cache issue. Go back to Settings > Mail > Compose and reply and re-enter your signature. If you use multiple browsers or devices, remember that the web signature is account-wide but only appears when you're logged into Outlook online.

Removing or disabling your signature

To stop using a signature entirely, go back to the signature settings and delete it. In desktop Outlook, select the signature in the Signatures window and click Delete. In Outlook on the web, clear the text from the Email signature box and save.

If you have multiple signatures and just want to stop using one of them, you don't have to delete it — just change which one is set as your default. The unused signatures stay in your account and you can reactivate them later if you need them.

Frequently Asked Questions

Can I use HTML code or special characters in my signature?

Desktop Outlook's signature editor accepts basic HTML if you switch to HTML mode, but it's easier to just use the formatting buttons (bold, italic, color) in the editor itself. Special characters like © or — work fine if you type them directly or copy them in. Avoid pasting large blocks of HTML code — Outlook may strip it out or display it incorrectly.

What's the difference between a signature and a template?

A signature is a block of text that appears at the bottom of every email you send. A template is an entire email draft that you can reuse — it includes the subject line, body text, and signature all together. Signatures are for contact info and closing lines; templates are for emails you send repeatedly with the same structure.

Why does my signature look different when someone receives my email?

Different email clients (Gmail, Apple Mail, Outlook, etc.) display formatting differently. A signature that looks perfect in Outlook might show different fonts or colors in someone else's inbox. Stick to common fonts like Arial or Calibri, avoid bright colors, and test your signature by sending it to yourself in other email accounts.

Can I set different signatures for different email accounts?

Yes, in desktop Outlook. If you have multiple accounts set up, you can create separate signatures for each one. When you compose a new message, Outlook automatically selects the signature that matches the account you're sending from. In Outlook on the web, you get one signature per account, and it applies to all mail from that account.

Does my signature take up storage space in my mailbox?

No. Your signature is stored in Outlook's settings, not in your mailbox. It only uses storage when it's actually included in a sent email, and even then the amount is tiny — a few hundred bytes at most. You can have as many signatures as you want without worrying about hitting your storage limit.