What a signature is and why you need one

A signature in Outlook is a block of text that appears automatically at the bottom of every email you send. It typically contains your name, job title, phone number, and company name — information you would otherwise type manually into every message. Once you set it up, Outlook adds it to new emails without you doing anything.

The signature saves time if you send many emails, and it gives recipients a consistent way to contact you or learn who you are. It looks more professional than signing off with just your first name, and it means you will not accidentally send an email without your contact details.

Outlook lets you create multiple signatures — one for work, one for personal use, one for formal messages — and choose which one to use for each email, or set a default that applies to all outgoing mail.

Key Takeaways

  • Signatures are created in Outlook settings, not in the email itself, and appear automatically on every new message you compose.
  • You can create multiple signatures and choose which one to use for each email, or set one as your default.
  • A signature can include text, your contact details, a job title, and a company name, but not images or logos in the basic version.
  • Signatures explore to new emails you write but not to emails you reply to, unless you change that setting.
  • The steps differ slightly between Outlook on the web, Outlook for Windows, and Outlook for Mac.

Creating a signature in Outlook for Windows

Open Outlook and go to File in the top left corner. Click Options, then select Mail from the left sidebar. Scroll down until you see Signatures and click that button.

A window will open with three sections: E-mail Signature, New messages, and Replies and forwards. Under E-mail Signature, click the New button. Type a name for your signature — something like "Work" or "Professional" — and click OK. A text box will appear where you can type your signature content.

Type your name, title, phone number, email address, or any other information you want to appear at the bottom of your emails. You can format the text using the buttons above the text box: bold, italic, underline, font choice, and text color. When you are finished, click OK to save the signature.

If you want this signature to appear on all new emails automatically, go back to the New messages dropdown and select the signature you just created. If you want it only on replies and forwards, use the Replies and forwards dropdown instead. Click OK again to save your settings.

Creating a signature in Outlook on the web

Log into your Outlook account at outlook.com or outlook.office.com. Click the Settings gear icon in the top right corner and select View all Outlook settings. Click Mail in the left sidebar, then scroll down to Compose and reply.

Find the Email signature field and click inside the text box. Type your signature — your name, title, phone number, or any other details you want to include. You can use the formatting buttons above the text box to make text bold, italic, or change the color.

When you are done, scroll to the bottom of the page and click Save. Your signature will now appear automatically on all new emails you send from Outlook on the web. Unlike the Windows version, Outlook on the web does not let you create multiple signatures or choose whether to include the signature on replies.

Creating a signature in Outlook for Mac

Open Outlook and click Outlook in the menu bar at the top of the screen. Select Preferences, then click Signatures. A window will open showing your email accounts on the left and signature options on the right.

Click the plus sign at the bottom left to create a new signature. Type a name for it and press Enter. The text box on the right will become active. Type your signature content — name, title, phone, email, or any other information. Use the formatting buttons to adjust the appearance.

To set this signature as your default for new messages, click your email account on the left side and use the dropdown menu next to Choose default signature to select the signature you just created. Click Save when you are finished.

What you can and cannot include in a signature

Text is the easiest thing to add: your name, job title, phone number, email address, company name, website URL, or a short tagline. You can format the text with bold, italic, underline, different fonts, and different colors. Most people keep signatures straightforward — one or two lines with essential contact details — because long signatures can look unprofessional and take up space in every email.

Images and logos are more complicated. In Outlook for Windows and Mac, you can insert an image by using the Insert menu while editing your signature, but this does not always work smoothly across different email clients. In Outlook on the web, you cannot insert images at all. If you need a logo or image in your signature, the Windows and Mac versions will let you try, but the image may not appear correctly when someone receives your email, depending on their email client.

Links work in signatures: you can type a URL like www.example.com and Outlook will turn it into a clickable link. Some people add their LinkedIn profile, website, or social media links this way.

Signatures on replies and forwarded emails

By default, Outlook adds your signature only to new emails you write, not to emails you reply to or forward. This is usually what you want — a long chain of replies with a signature at the bottom of each one looks cluttered.

If you want your signature to appear on replies and forwards too, you can change this in Outlook for Windows and Mac. In Windows, go back to File > Options > Mail > Signatures and use the Replies and forwards dropdown to select your signature. In Mac, click your email account and use the dropdown next to Choose default signature for replies and forwards. Outlook on the web does not offer this option.

Troubleshooting signatures that do not appear

If you created a signature but it is not showing up on your emails, check that you selected it as your default. In Windows, go to File > Options > Mail > Signatures and make sure your signature is chosen in the New messages dropdown. In Mac, click your email account and check the Choose default signature dropdown. In Outlook on the web, go to Settings > Mail > Compose and reply and make sure the signature text box is filled in.

If you are using multiple email accounts in Outlook, each account can have its own default signature. Make sure you are checking the right account. In Windows and Mac, click the account name on the left side of the Signatures window to see which signature is set for that specific account.

If your signature appears in Outlook but not in the email the recipient receives, the problem is usually with how the email was sent or received. Some email clients strip out formatting or signatures. Ask the recipient to check their spam folder or try sending a test email to a different address to see if the signature appears there.

Frequently Asked Questions

Can I have different signatures for different email accounts?

Yes, in Outlook for Windows and Mac. Each account can have its own default signature. In the Signatures window, click the account name on the left, then set a different signature for that account. Outlook on the web does not support multiple accounts in the same interface, so you would need to set a signature for each account separately when you log in.

How do I edit a signature after I create it?

In Windows, go to File > Options > Mail > Signatures, click the signature name in the list, and edit the text in the box on the right. In Mac, click the signature name in the list and edit the text. In Outlook on the web, go to Settings > Mail > Compose and reply and edit the text in the Email signature box. Click Save when you are done.

Can I use a signature for only some of my emails?

In Outlook for Windows and Mac, you can create multiple signatures and choose which one to use for each email. When you compose a new message, look for an Insert menu or Signature option and select the one you want. In Outlook on the web, you have only one signature that appears on all emails.

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

Different email clients display text, colors, and fonts differently. A signature that looks good in Outlook might appear with different spacing or colors in Gmail or Apple Mail. Keep your signature straightforward — plain text with basic formatting — to make sure it looks consistent across all email clients.