How to add a logo to an Outlook email signature

The short answer

To add a logo to an Outlook signature, export a raster image (usually a PNG) from your vector logo file. Then open Outlook's signature settings, create or edit a signature, insert the image with the editor's picture tool, and save. Finally, send a test message to confirm the logo shows up at the right size and clarity for recipients.

Two terms matter here. A vector logo is built from mathematical paths: points, lines and curves. It can be scaled to any size without losing sharpness, and it typically lives in formats such as SVG, AI, EPS or PDF. A raster image is a fixed grid of pixels, as in PNG or JPG files. Email signatures normally need the raster version, because many email programs do not reliably display SVG or other vector formats. Keep the vector file as your master artwork and treat the PNG as a delivery copy made for this one use.

Before you start

A master logo file, ideally vector, that you have permission to use. A file extension alone does not prove the file contains true vector paths, that it is editable, or that you are allowed to reuse it.
The approved version of the logo for small sizes, if your brand has one. Simplified marks often read better than the full lockup at signature scale.
A vector editor or other export tool that can save a PNG with a transparent or solid background.
Access to the Outlook version you send from: classic Outlook for Windows, the new Outlook for Windows, Outlook on the web, Outlook for Mac or the mobile app.
A second email account or device for testing what recipients see.

Step 1: Prepare the artwork in your vector file

Open the master file and check the paths before exporting. Look for stray points, unclosed shapes or hidden layers that could show up in the export. If the logo contains live text, convert it to outlines (vector shapes) or confirm the correct font is installed. Otherwise your software may substitute a different typeface when it renders the image. Converting to outlines locks the letterforms as paths, so the wordmark looks the same on any machine.

Thin strokes, small counters (the enclosed spaces inside letters such as e or o) and fine taglines can blur or fill in at small pixel sizes. If your brand provides a compact or icon-only version, it is usually the better choice for a signature. That is a design recommendation, not a technical requirement.

Step 2: Export a PNG suited to email

Choose PNG for logos with flat colors, sharp edges or transparency. JPG compression tends to create soft or blotchy edges around crisp shapes.
Trim the artboard or canvas to the logo plus a small, even margin. Excess empty space makes the logo look misaligned next to your signature text.
Export at a larger pixel size than you plan to display, then scale it down in Outlook. High-density screens can make an image exported at exact display size look soft. The right dimensions depend on your layout, so no single figure is given here.
Decide on the background. A transparent background blends with the message, but a dark logo on transparency can disappear when a recipient uses dark mode. A solid background, or a version with a light outline or padding, avoids that risk.
Keep the file size modest so the signature does not noticeably bloat every message.

Step 3: Insert the logo in Outlook's signature editor

The exact menu names and locations differ between Outlook versions and change with updates. The paths below describe the general route, not version-specific commands. If your screen looks different, search Outlook's own settings or help for "signature."

Classic Outlook for Windows: open the signature settings, generally found under File, then Options, then Mail, then Signatures. Create a new signature or select an existing one, place the cursor where the logo should go, and use the picture button in the editing toolbar to insert your PNG.
New Outlook for Windows and Outlook on the web: open Settings, find the signatures section under the account or mail settings, then create or edit a signature and use the editor's image option to insert the file.
Outlook for Mac: open the app's settings or preferences, find Signatures, and add the image in the signature editing area.
Outlook mobile apps: signature options on mobile may be more limited than on desktop, and image support is not confirmed here. Check what your current app version allows.

After inserting the image, resize it in the editor if the controls allow, set it as the default signature for new messages and, if you want, for replies and forwards. Then save. In versions that support it, add alt text (a short text description such as the company name) to the image. Alt text appears when images are blocked and is read aloud by screen readers.

Keep contact details as live text

Put your name, title, phone number and other details in the signature as typed text beside or below the logo, not inside the image. Live text stays readable when images are blocked, can be selected and copied, and works with screen readers. It also keeps the image focused on the logo, so it stays clean at small sizes. If you want the signature text to match the brand's typography, keep in mind that recipients only see a custom font if it is installed on their device. Choosing a widely available fallback font is the more predictable option.

A note on "signature line"

People searching for a signature line in Outlook usually mean the email signature block described above. Office apps also have a separate signature line feature for documents that need a formal sign-off, which is different from an email signature. For adding a logo to outgoing mail, the signature settings are the right place.

Step 4: Test and confirm the result

Send a new message to yourself and to an account on a different email service, then open both.
Check that the logo appears at the intended size, looks sharp rather than blurry or jagged, and lines up with the signature text.
View the message on a phone as well as a computer.
Switch the receiving app to dark mode, if available, and confirm the logo stays visible.
Reply to and forward the test message to see whether the logo survives in a thread.
Notice whether the logo shows up as a separate attachment. Some setups display embedded signature images this way. If that confuses recipients, check your Outlook version's options or ask your email administrator.
Open the message with images blocked, where possible, and confirm the alt text and live contact details still identify you.

If the logo looks blurry, re-export from the vector master at a higher pixel size and scale it down in the editor. If it disappears in dark mode, switch to a version with a solid background or contrasting outline. If it looks cramped or oddly placed, trim the export margins and re-insert it.

What this guide could not confirm

No version-specific Outlook documentation was available for this article, so menu paths are given in general terms, and mobile image support is unconfirmed. No recommended pixel dimensions or file-size limits are stated, because none were verified. Check the current help pages for your Outlook version and any brand or IT guidelines your organization provides before rolling out a signature across a team.