How to Add a Handwritten Signature in Outlook Email

Your Outlook email signature probably has your name, title, and phone number in plain text. That is fine. But adding a handwritten signature image underneath turns a generic sign-off into something that feels personal and professional at the same time. Here is how to set it up on desktop, web, and mobile.

What You Need Before You Start

The whole process comes down to one thing: a signature image file. Specifically, you need a PNG file with a transparent background. Not a JPG. Not a screenshot of your signature on white paper. A transparent PNG.

Why does the format matter? Because a JPG always has a white rectangular background. When you insert it into an email, that white box sits on top of your email content and looks terrible. A transparent PNG blends seamlessly, as if you signed the email with an actual pen.

Method 1: Outlook Desktop App (Windows)

The classic Outlook desktop application gives you the most control over your email signature. This method works for Outlook 2016, 2019, 2021, and Microsoft 365.

From now on, every email you compose will automatically include your handwritten signature. Open a new email to verify it looks right. If the image is too large, go back to the signature editor and resize it. A width of around 200-300 pixels usually works well.

Method 2: Outlook on the Web (outlook.com / Microsoft 365)

If you use Outlook through a browser, the process is slightly different but just as straightforward.

1. Click the gear icon (Settings) in the top-right corner.
2. Go to Mail → Compose and reply.
3. In the signature editor, type your contact details first.
4. Click the image icon in the formatting toolbar (it looks like a small picture frame).
5. Select Insert pictures inline and upload your transparent PNG.
6. Resize if needed by clicking the image and using the handles.
7. Check the boxes for "Automatically include my signature on new messages" and "Automatically include my signature on messages I forward or reply to."
8. Click Save.

One thing to watch out for: Outlook on the web sometimes compresses images. If your signature looks blurry, try uploading a slightly larger version (400px wide instead of 200px). The editor will scale it down, but the extra resolution keeps it sharp.

Method 3: Outlook for Mac

The Mac version of Outlook has a cleaner interface but the signature editor is more limited than Windows.

1. Open Outlook and go to Outlook → Preferences → Signatures.
2. Click the + button to create a new signature.
3. In the editor, type your contact information.
4. To add your handwritten signature image, open Finder, locate your PNG file, and drag it directly into the signature editor. The Mac editor does not have an image insert button, so drag-and-drop is the way.
5. Select which email account should use this signature.
6. Close the preferences window. Changes save automatically.

If the drag-and-drop does not work (this happens occasionally with older versions), try copying the image from Preview or Photos and pasting it into the signature editor with Cmd+V.

Method 4: Outlook Mobile App (iOS & Android)

Here is the bad news: the Outlook mobile app only supports plain text signatures. You cannot insert images directly into the mobile signature settings. Microsoft has not added this feature despite years of user requests.

The workaround? Set up your handwritten signature in Outlook desktop or web. When you send emails from those platforms, recipients will see your full signature with the image regardless of what device they use to read it. The mobile app limitation only affects emails composed on the phone itself.

If you absolutely need a handwritten signature on mobile-composed emails, you have two options:

• Save your signature image to your phone's photo library and manually attach or insert it when needed.
• Use the Outlook web app in your mobile browser instead of the native app. The web version supports image signatures even on mobile screens.

Which Outlook Version Should You Use?

Tips for a Professional-Looking Result

Getting the signature into Outlook is the easy part. Making it look good requires a few extra considerations.

Keep the image small

Your handwritten signature should be roughly 200-300 pixels wide and 60-100 pixels tall. Anything larger dominates the email and looks unprofessional. Think of it as the size your actual signature would be on a letter.

Use a transparent background

This is worth repeating because it is the most common mistake. A transparent PNG is essential. Many people screenshot their signature on white paper and wonder why it looks like a sticker pasted onto their email. The white rectangle is the problem. Transparent background is the solution.

Test in dark mode

More and more people read email in dark mode. A black signature on a transparent background will be invisible against a dark email background. If your recipients use dark mode, consider using a dark blue or dark gray color for your signature instead of pure black. Or create your signature in blue ink, which is visible on both light and dark backgrounds.

Position it correctly

Place the handwritten signature image above your typed name and title, not below. The visual hierarchy should be: handwritten signature, then your name, then your title and contact details. This mirrors how a physical letter looks when you sign above your printed name.

Common Problems and Fixes

Image shows as an attachment instead of inline

This usually happens when you attach the image instead of inserting it inline. In the signature editor, make sure you use the image insert button (picture icon), not the attachment paperclip. If the image still shows as an attachment, try right-clicking it in the editor and selecting "Display as Inline."

Signature looks different to recipients

Email clients render HTML differently. What looks perfect in your Outlook might look slightly different in Gmail or Apple Mail. The best way to test is to send yourself a test email and open it in a different email client or on your phone. Minor differences are normal and unavoidable.

Image disappears in replies

Check your signature settings. Make sure you have selected your signature for both "New messages" and "Replies/forwards." These are separate settings in Outlook, and it is easy to forget the second one.

What About Gmail?

If you also use Gmail, the process is similar but lives in a different place. Go to Gmail Settings → General → Signature, and use the image icon to insert your PNG. We have a separate guide for creating email signatures that covers Gmail, Yahoo, and other providers in detail.

The good news is that the same transparent PNG file works everywhere. Create it once with Signature Sketch, and use it across Outlook, Gmail, Apple Mail, or any other email client.

Frequently Asked Questions