How to Add a Logo or Image to Your Outlook Signature (2026)

The short answer: In new Outlook or Outlook on the web, go to Settings → Accounts → Signatures, click the image icon in the signature toolbar, and insert your logo. In classic Outlook for Windows, go to File → Options → Mail → Signatures, select your signature, and click the image icon to insert it. Use a logo around 150 to 300 pixels wide and host it somewhere reliable so it is not sent as an attachment. The fastest way to get a clean result is to build the whole signature (logo included) in a free generator and paste it in.

A logo is what makes an email signature look like it belongs to a real company instead of a plain text footer. Here is how to add one in every version of Outlook, the size to use, and how to stop it from breaking for your recipients.

Before you start: get your logo ready

• Format: use PNG (best for logos with transparency), JPG, or GIF. These render in every email client. Avoid WebP and SVG, which many clients (including Outlook) will not display in email.
• Size: aim for roughly 150 to 300 pixels wide. Export at 2x and then set the display width for crisp results on high-resolution screens. Our email signature size guide has exact recommendations.
• Hosting: the most reliable logos are hosted at a public URL rather than pasted from your desktop, which helps avoid the “image sent as attachment” problem described below.

New Outlook and Outlook on the web

1. Click Settings (the gear icon), then Accounts → Signatures.
2. Select an existing signature or click New signature.
3. In the signature editing box, click the insert picture / image icon in the formatting toolbar.
4. Choose your logo file (or paste an image you have copied).
5. Resize if needed, set the signature as your default for new messages and replies, and click Save.

Classic Outlook for Windows

1. Go to File → Options → Mail → Signatures.
2. Select the signature you want (or create one with New).
3. In the edit area, click the image icon on the right of the toolbar.
4. Browse to your logo file and insert it.
5. To link the logo to your website, select the image and click the hyperlink icon.
6. Set your defaults and click OK.

Outlook for Mac

1. Go to Outlook → Settings → Signatures.
2. Create or select a signature.
3. Drag your logo into the signature editor, or use Insert → Picture.
4. Set the signature as default for your account.

Outlook on mobile (iPhone and Android)

The Outlook mobile app only supports a plain-text signature in its own settings, so you cannot insert a logo there directly. The reliable way to get a logo on mobile is to have the signature applied to your account rather than set on the device. That is what central deployment (below) does, and it is the only way most teams get branded signatures on phones. For why mobile signatures often go missing, see Outlook signature not showing.

Why your logo breaks (and how to prevent it)

• It arrives as an attachment. When a logo is embedded directly, some recipient clients show it as a file attachment instead of inline. Hosting the image at a public URL avoids this.
• It shows as a red X or broken icon. The image link is unreachable, blocked, or was stored somewhere temporary. Use stable hosting.
• It is huge or blurry. The source image is the wrong size. Export at 2x and set a sensible display width (see the size guide).
• It disappears in replies. Often the signature default is not set for replies, or the recipient’s client blocks remote images. Work through the troubleshooting checklist.

The easy way: build it once with your logo

Inserting and resizing images inside Outlook’s editor is fiddly, and the result often differs between new and classic Outlook. It is usually faster to design the whole signature, logo and all, in a tool that outputs clean, email-safe HTML, then paste it into Outlook.

Our free email signature generator lets you upload your logo and photo directly (PNG, JPG, or GIF), pick a layout, and copy the finished signature into any version of Outlook in one click. No sign-up required.

For a team, you do not want everyone hand-inserting logos. A signature manager applies one branded, logo-included signature to everyone automatically through an Outlook add-in. With Firma, an admin designs the template once, and it deploys across Outlook on desktop, web, and mobile from the Microsoft 365 admin center. See how to deploy signatures to all users in Microsoft 365 for the full options, and Outlook email signatures for client-specific detail. On Gmail, the same applies via Google Workspace email signatures.

Frequently asked questions

How do I add a logo to my Outlook signature? In new Outlook or the web, go to Settings → Accounts → Signatures and click the image icon to insert your logo. In classic Outlook, go to File → Options → Mail → Signatures and use the image icon. Use a PNG around 150 to 300 pixels wide.

What size should an email signature logo be? Around 150 to 300 pixels wide for a horizontal logo. Export at 2x resolution and set the display width so it stays crisp on high-resolution screens. See our email signature size guide.

Why is my signature logo showing as an attachment? The image is embedded rather than linked, so some recipient clients treat it as a file. Hosting the logo at a public URL and referencing it, which is what signature tools do, avoids this.

Can I add a logo to my signature on the Outlook mobile app? Not directly, the mobile app only offers a plain-text signature. To get a branded, logo-included signature on mobile, deploy it to the account centrally rather than setting it on the device. See Microsoft 365 email signatures.

What image format should I use for an email signature? PNG (great for logos and transparency), JPG, or GIF. Avoid WebP and SVG, which do not render in Outlook and several other email clients.

Is there a free tool to make an Outlook signature with a logo? Yes. Our email signature generator is free with no sign-up and lets you upload your own logo. Firma also has a free plan for up to 2 users (paid plans from $1.20 per seat per month billed annually, $1.50 monthly).