Outlook Signature Not Showing? How to Fix It in New Outlook, Classic Outlook, Web, Mac and Mobile

If your Outlook signature isn't showing, the cause is almost always one of three things: no default signature is set for that account (new messages and replies are two separate settings), you're working in a different Outlook app from the one where you created the signature (classic Outlook, new Outlook, the web, Mac and mobile can each keep their own), or the email is in plain text. Broken or missing images are a separate family of problems, covered further down.

This guide starts with a 60-second checklist, then walks through each symptom with the fix for your version of Outlook. Every menu path was checked against Microsoft's own support pages in October 2026.

First, find out which Outlook you're using

Microsoft now ships several Outlook apps, and they don't all share settings. Fixing the signature in the wrong one is the most common reason "I already set it up" doesn't help.

• Classic Outlook for Windows has a File tab in the top-left corner.
• New Outlook for Windows has no File tab and shows a New Outlook toggle in the top-right corner. It looks almost identical to Outlook in a browser.
• Outlook on the web (outlook.office.com for work accounts) and Outlook.com (personal accounts) run in your browser.
• Outlook for Mac keeps its settings under the Outlook menu.
• Outlook for iOS and Android keeps its own signature in the app.

Quick checklist: run through this first

1. Is a signature selected as the default for this account? New messages and replies/forwards are set separately.
2. Are you in the app where you created it? See the table above.
3. Is the email in HTML? Plain text emails can't show formatting or images.
4. Did you send a test to a different email app, such as a Gmail address? What you see in your own Sent folder isn't always what the recipient gets.
5. Are the images hosted online, or pasted from a file on your computer?
6. Is Outlook up to date? In classic Outlook: File > Office Account > Update Options > Update Now.
7. Does your company add a signature automatically? If so, some of what you see (or don't see) is controlled by IT, not by you.

If one of these points at your problem, jump to the matching section below.

No signature at all on new emails

New Outlook for Windows, Outlook on the web and Outlook.com

1. Select Settings (the gear icon).
2. Go to Accounts > Signatures.
3. If you have more than one account, pick the one you send from.
4. Check that your signature is in the list, then use the checkboxes below the editor to apply it to new messages (and, if you want, to replies and forwards).
5. Select Save.

Older guides send you to Settings > Mail > Compose and reply for this. Microsoft moved signatures to Accounts > Signatures, and that is the path in its current documentation.

To add a signature to a single message by hand, open a new email and choose Signature in the Insert group of the Message tab.

Classic Outlook for Windows

1. Go to File > Options > Mail > Signatures.
2. Under Choose default signature, pick the right account in E-mail account.
3. Set New messages to your signature. If it says (none), Outlook won't add anything.
4. Select OK.

One quirk Microsoft documents: if you create the signature from inside an open email, classic Outlook does not add it to that email, even with the default set. It starts working from the next new message.

If the Signature button is greyed out, or your saved signatures vanished from the list, you were most likely moved to roaming signatures (more on that below). Microsoft Q&A threads from this rollout show two fixes that worked for users: look under the account entry Signatures on this device, or delete the signature, create it again with a new name, set it as the default, and restart Outlook.

Outlook for Mac

Open Outlook > Settings, then Signatures under Mail. Under Choose which signature appears, pick your account and set For new messages. If you have several accounts, each one needs its own default.

The email is in plain text

Plain text can't show bold text, colors or pictures, so a designed signature either disappears or shows as bare text.

• New Outlook: Settings > Mail > Compose and reply > Message format, choose HTML, then Save.
• Classic Outlook: File > Options > Mail > Compose messages in this format, choose HTML.

Signature on new emails but not on replies or forwards

This one surprises people because it looks like a bug. It isn't: Outlook treats replies and forwards as a separate setting, and it is off by default in classic Outlook.

• New Outlook, web and Outlook.com: Settings > Accounts > Signatures, tick the option for replies and forwards.
• Classic Outlook: File > Options > Mail > Signatures, set Replies/forwards to your signature.
• Mac: Outlook > Settings > Signatures, set For replies or forwards.

Still missing on some replies? Look at the email you're replying to. When the original message is plain text, classic Outlook keeps the reply in plain text too, and your images and formatting go with it. Switch that one reply back with Format Text > HTML in the message window.

Many people deliberately use a shorter signature for replies (name, title, phone), so a thread doesn't repeat your full logo block ten times. That's a good habit, not a problem to fix.

Signature images not showing (blank boxes, red X or a "cannot be displayed" error)

Start by working out who can't see the image: you, while writing, or your recipient.

The recipient's Outlook is blocking downloads

Classic Outlook for Windows blocks automatic picture downloads from the internet by default, according to Microsoft. The recipient sees an empty frame and a message bar until they choose Download Pictures or add you to their Safe Senders list. You can't change that setting for them. What you can do:

• Keep your name, phone and email as real text, never as part of an image, so the signature still works with images off.
• Give every image a short description (alt text), such as your company name.
• Ask regular contacts to add you to Safe Senders.

The image no longer exists where the signature points

If the image was pasted from a file on your computer, a shared drive, or a website page that has since changed, the link breaks. Images pulled from cloud storage with private sharing settings break for everyone except you. The fix is to host the image at a stable public address and insert it again.

Classic Outlook's May 2026 image bug

After the May 12, 2026 updates, Microsoft confirmed a bug in all supported versions of classic Outlook: images in emails and signatures didn't display, sometimes with a red X and the error "The linked image cannot be displayed. The file may have been moved, renamed, or deleted." Microsoft marked it fixed in builds released from June 2026 onward. If you see this error, update Office (File > Office Account > Update Options > Update Now). Microsoft also warns that replies and forwards sent while the bug was active may have permanently lost the image.

The image format isn't supported

SVG and WebP are safe on websites but not in email. According to caniemail.com's data, classic Outlook 2007 to 2016 for Windows shows no SVG at all, and Gmail on the web only started displaying linked SVG in caniemail's September 2026 test, and then as a converted PNG. WebP doesn't display in any tested version of Outlook for Windows. Use PNG for logos and icons and JPG for photos. Our email signature size guide covers formats in more detail.

Signature images arrive as attachments (image001.png)

This happens because of how the image travels with your email. There are two ways:

• Embedded: the picture file is packed inside every email you send. Outlook shows it in place, but many other email apps list it as an attachment called image001.png, image002.jpg and so on, and add a paperclip icon to the message.
• Hosted (linked): the email contains only a web address, and the recipient's app loads the picture from there. Nothing gets attached.

Microsoft MVP Robert Sparnaaij, who has documented Outlook signatures for two decades, calls hosting the image "the only reliable way" to stop the attachment problem, whatever app the recipient uses. Signatures with images stored on a server, such as the ones Signguin creates, take this route.

There is one catch in classic Outlook for Windows. Even with linked images, classic Outlook can download the pictures and embed them when you send. It is controlled by a registry value Microsoft doesn't expose in the settings screens:

• Key: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\Mail
• Value: Send Pictures With Document (DWORD)
• Set to 0 to keep images linked. If the value is missing or set to 1, Outlook embeds them.

On a work computer, ask IT before editing the registry. On your own PC, close Outlook first and restart it afterwards.

Two more causes are worth checking:

• The message went out as plain text. Plain text can't show pictures, so they become attachments.
• Microsoft notes that signatures containing VML code (an old Microsoft graphics format some signature editors produce) can make elements appear as attachments instead of inline images.

Signature looks broken for recipients using Outlook for Windows

You built a tidy signature, it looks right in Gmail or on your Mac, and then a client on Outlook for Windows sends a screenshot where everything is stretched, stacked or misaligned. The reason: classic Outlook for Windows uses Microsoft Word's engine to display email, not a web browser. Microsoft's own signature help even tells classic Outlook users to build complex signatures in Word and paste them in.

Word supports a much smaller slice of web code than a browser. Based on caniemail.com's testing of Outlook for Windows:

• Width set with CSS is ignored on images, div, p and span elements. A layout built with div blocks collapses or spreads across the screen. HTML tables with width attributes are what holds.
• Image size has to be set with HTML width and height attributes, not CSS. Otherwise a logo saved large for sharp screens shows at full size.
• Background images don't work without a special Microsoft-only code path (VML), so text placed on a colored background image loses its background.
• Web fonts are ignored, and text styled with a downloaded font can fall back to Times New Roman instead of your chosen backup font.
• Display scaling matters. On computers set to 120 DPI (125% scaling), image sizes set in attributes don't scale with the text, so images look smaller than the surrounding words.

Images also go blurry for a classic Outlook reason. When you insert a picture with the signature editor, Outlook rescales it as if it were a 96 DPI image, and when you send, it compresses the picture permanently, according to Robert Sparnaaij. In Microsoft 365, you can turn that off: File > Options > Mail > Editor Options > Advanced > Do not compress images in file.

How to fix it for good: use a signature built for email, with table-based layout, styles written inline on each element, fixed width and height on every image, and standard fonts like Arial, Verdana or Georgia. Then test by sending to a colleague on classic Outlook for Windows. That is how Signguin builds signatures: email-safe tables, inline styles, fixed-size PNG images and buttons that hold up in classic Outlook. No generator can promise identical pixels everywhere, though, because Word and a phone's mail app simply draw things differently.

Signature disappeared after switching to new Outlook (roaming signatures)

Since build 2303, Outlook for Windows stores signatures in your mailbox instead of only on your PC. Microsoft calls these roaming signatures. They follow you between new Outlook, classic Outlook and Outlook on the web, which is good, but the switch causes three common surprises:

1. Only your defaults moved. During migration, Outlook copied only the signatures set as default for New messages or Replies/forwards to your mailbox. Other signatures stayed on the old PC under Signatures on this device, where you can still insert them but not edit them unless you attach them to an account.
2. Some accounts don't roam at all. Microsoft says roaming covers Microsoft 365 and Outlook.com mailboxes only. Exchange servers your company runs itself, POP and IMAP accounts, and other email services stay local to each device.
3. New Outlook doesn't read classic's signature files. Classic Outlook keeps signatures as .htm, .rtf and .txt files on your PC; new Outlook keeps them in your mailbox. New Outlook imports your classic settings, signatures included, the first time you start it, but only if Store my Outlook settings in the cloud was ticked in classic Outlook (File > Options > General). If that box was off, nothing came over.

If the import didn't happen, the fix Microsoft's own moderators recommend is copy and paste (or tick that box and re-run the import, as described in our Outlook signature guide). Open both apps side by side. In classic Outlook, go to File > Options > Mail > Signatures, select the signature and copy it. In new Outlook, go to Settings > Accounts > Signatures, add a new signature and paste.

One user-reported tip from Microsoft Q&A: if a classic signature with a very long name refuses to appear in new Outlook, shorten the name in classic Outlook, wait a moment for the sync, then switch.

Some companies turn roaming off with the DisableRoamingSignatures registry or Group Policy setting, usually because they use a signature add-in that the new storage would break. If your signatures behave differently on two work PCs, that may be why, and it is a question for IT.

Signature not syncing between devices or not showing on your phone

Roaming signatures sound like "everywhere", but in October 2026 they only reach Outlook for Windows and Outlook on the web. A Microsoft Q&A answer from November 2025 confirms that new Outlook for Mac uses local signatures and the iOS and Android apps don't read roaming signatures, with no setting or registry change to enable it. Microsoft's feedback team has said it is working on syncing signatures across devices, but that response is more than two years old and there is still no date.

So for now:

• Mac: set the signature in Outlook > Settings > Signatures on each Mac. Microsoft also notes that support for legacy Outlook for Mac ends in October 2026, so it's a good moment to move to the current version.
• iPhone and Android: in the Outlook app, open Settings, tap Signature under Mail, then type your signature. Turn on Per Account Signature if each account needs its own.

The mobile editor is basic. When you copy a designed desktop signature into it, images often don't come along. That limitation is confirmed in a May 2026 Microsoft Q&A answer. Our Outlook mobile signature guide explains the workarounds step by step, including which parts of a designed signature survive on a phone.

Two signatures on every email (company signature rules)

If your emails reach people with your signature twice, or with a company footer under your own signature, somebody else is adding one on the server. In Microsoft 365, admins can create a mail flow rule in the Exchange admin center that appends a signature or disclaimer to outgoing mail. You can't see it while writing, because it is added after you press Send. Server-side signature tools work the same way.

Things to check:

• Ask IT whether a rule or signature tool is active. If it is, remove your own signature (set the defaults to none) or ask them to exclude you.
• Repeated footers down a long thread usually mean the rule has no exception for messages that already contain it. Microsoft's own documentation recommends adding one.
• On your phone, the Outlook app adds "Get Outlook for iOS" or your mobile signature on top of any server rule. Clear it in Settings > Mail > Signature.

When it's faster to rebuild the signature

If your signature was pasted together from Word, a screenshot or an old template, you can spend an afternoon chasing image001.png attachments and stretched logos. Starting from email-safe code is usually quicker.

Signguin is a free generator that builds that kind of signature: table-based HTML, inline styles, fixed-size images hosted on Signguin's servers, social icons as PNG files (not SVG), and a preview in light and dark mode on phone and desktop before you install. The free plan needs no sign-up, and you copy the result into Outlook following our Outlook signature guide.

What no tool can fix: a default signature that isn't selected, plain text replies, a recipient who blocks images, the missing roaming support on Mac and mobile, or a company rule that adds its own footer. Those are settings, and the sections above cover them.

FAQ

Why is my signature not showing in Outlook replies?

Replies and forwards have their own default signature setting, separate from new messages. In new Outlook or on the web, go to Settings > Accounts > Signatures and tick the option for replies and forwards. In classic Outlook, go to File > Options > Mail > Signatures and set Replies/forwards. If it still fails on one reply, the original email was probably plain text, so switch it with Format Text > HTML.

Why do my Outlook signature images show up as attachments?

The images are embedded in the email instead of linked from a web address. Many email apps list embedded pictures as attachments named image001.png. Use images hosted online. In classic Outlook for Windows, also check the registry value "Send Pictures With Document": if it's missing or set to 1, Outlook embeds even linked images when you send.

Why is my Outlook signature not showing on my phone?

The Outlook app for iOS and Android keeps its own signature and, as of October 2026, doesn't read the roaming signatures that Outlook for Windows and the web share. Open the app's Settings, tap Signature under Mail, and enter it there. Designed signatures with images often lose the images when pasted into the mobile editor.

Why did my signature disappear in new Outlook?

New Outlook stores signatures in your mailbox and only imports classic Outlook's signatures on first start if "Store my Outlook settings in the cloud" was ticked. Only signatures set as defaults roam automatically, and POP, IMAP and self-hosted Exchange accounts don't roam at all. Copy the signature from classic Outlook (File > Options > Mail > Signatures) and paste it into new Outlook under Settings > Accounts > Signatures.

Why can't recipients see the images in my Outlook signature?

Most often their email app blocks images from senders it doesn't know. Classic Outlook does this by default until the reader chooses Download Pictures. Other causes are images stored on your own PC or a private drive, unsupported formats like SVG or WebP, plain text messages, and a classic Outlook bug from May 2026 that Microsoft fixed in June updates.

Do Outlook signatures sync between devices?

Partly. Since build 2303, signatures for Microsoft 365 and Outlook.com accounts sync between Outlook for Windows (classic and new) and Outlook on the web. Outlook for Mac and the iOS and Android apps keep separate signatures that you set up on each device. Microsoft says it is working on wider syncing but hasn't announced a date.