You change your signature in Outlook from the settings or from a new message window, depending on which Outlook you’re using. Here’s a quick, practical rundown.

Classic Outlook on Windows (desktop app)

  1. Open Outlook.
  2. Click File in the top-left.
  3. Select Options.
  4. In the left pane, click Mail.
  5. Click the Signatures… button (in the “Create or modify signatures for messages” section).
  6. In the Email Signature tab:
    • Select an existing signature to edit, or click New to create one.
    • Edit the text in the Edit signature box (you can change fonts, colors, add images, links, etc.).
  1. Under Choose default signature , pick:
    • The email account,
    • Which signature to use for New messages and for Replies/forwards.
  2. Click OK to save.

Alternative method in classic Outlook

  1. Click New Email to open a new message.
  2. On the message window, choose Signature in the toolbar.
  3. Click Signatures….
  4. Edit or create your signature in the same way as above, then click OK.

New Outlook for Windows / Outlook on the web (Outlook.com, browser)

The newer Outlook versions move this to “Compose and reply.”

  1. Open Outlook (new Windows app or web: outlook.com).
  2. Click the gear (Settings) icon (usually top-right).
  3. Click View all Outlook settings at the bottom of the pane (if needed).
  4. Go to Mail → Compose and reply.
  1. In the Email signature section:
    • Type or edit your signature in the editor (you can format text, add links, images, maybe emojis, depending on your org’s policies).
  1. Choose when the signature is added:
    • Automatically on New messages ,
    • On Replies/forwards , or both.
  2. Click Save.

Outlook for Mac

Steps are very similar, but labels differ slightly.

  1. Open Outlook on your Mac.
  2. In the top menu bar, click Outlook → Settings (or Preferences in some older builds).
  3. Select Signatures.
  1. Choose an existing signature to edit, or click + / New signature to create one.
  2. Edit the text, formatting, and any links or images.
  3. Assign the signature to specific accounts or message types if the options are available.
  4. Close the settings window to save changes.

Outlook mobile app (iPhone / iPad / Android)

  1. Open the Outlook app.
  2. Tap your profile icon or the menu (three lines) , then tap the gear (Settings) icon.
  3. Scroll down and tap Signature.
  1. Edit the existing text (often “Get Outlook for iOS/Android”) or paste your own simple signature.
  2. Tap back or save (if shown) to keep the changes.

Note: Mobile signatures are usually simpler; many corporate templates with logos and complex formatting don’t carry over well to phones.

Little “forum-style” tip

If your company uses a strict signature template (fonts, brand colors, logo), ask if they have a Word or HTML template and set it up once in the desktop or new Outlook app, then send yourself a test email to see how it looks on mobile and in plain text. That avoids the classic “it looked fine on my screen” issue that IT folks keep joking about.

TL;DR:
Go to Outlook settings → Mail → Signatures (or “Compose and reply” in new Outlook) → edit/create your signature → set it as default for new emails and replies → save.

Information gathered from public forums or data available on the internet and portrayed here.