Your Outlook signature should appear automatically on every email you send — it is one of those small details that makes your correspondence look polished and professional. When it suddenly stops showing up, or never appeared in the first place, it can be genuinely baffling. The good news is that the most common causes are straightforward to fix once you know where to look. This guide walks through every likely reason your Outlook signature is not showing and exactly how to resolve each one.
\n\n\n\nCommon Reasons Your Outlook Signature Is Not Showing
\n\n\n\nBefore diving into individual fixes, it helps to understand the range of things that can cause a signature to disappear or fail to appear at all. Outlook signatures are more complex than they first appear — they are stored locally, tied to specific accounts, and can behave differently depending on the compose format you are using.
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- The signature has not been set as the default for new messages or replies \n\n
- You are composing from a different email account than the one the signature is assigned to \n\n
- Outlook is set to compose in plain text mode, which strips all signature formatting \n\n
- You are on a new PC or have reinstalled Office — signatures do not transfer automatically \n\n
- The signature was accidentally deleted or overwritten \n\n
- You have set up different signatures for new emails and replies, and one of them is set to none \n\n
- You are accessing your email through Outlook on the Web rather than the desktop app — these have entirely separate signature settings \n
Work through the fixes below in order, as the first few checks resolve the problem for the vast majority of users.
\n\n\n\nFix 1 — Check the Default Signature Is Set
\n\n\n\nThe single most common cause of a missing signature is that no default has been assigned. Outlook does not insert a signature automatically unless you explicitly tell it which signature to use, and for which type of message. Here is how to check and correct this.
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- Open Outlook and click File in the top-left corner. \n\n
- Select Options from the left-hand panel. \n\n
- Click Mail in the left column of the Outlook Options window. \n\n
- Click the Signatures… button in the Compose messages section. \n\n
- Under Choose default signature, look at the two dropdowns: one for New messages and one for Replies/forwards. \n\n
- Set each dropdown to the signature you want to use. If either is set to (none), your signature will not appear for that message type. \n\n
- Click OK to save. \n
It is important to understand that new messages and replies are controlled independently. Many people set a signature for new emails but leave replies set to none, which means their signature only appears when they start a fresh conversation. If you want your signature on every email — including replies and forwards — you must set both dropdowns explicitly.
\n\n\n\nFix 2 — Check You Are Composing in HTML Mode
\n\n\n\nOutlook supports three message formats: HTML, Rich Text, and Plain Text. If your account is set to compose in Plain Text mode, Outlook will strip all formatting from your message — and that includes your signature, particularly if it contains any formatting, images, or a logo. Even a text-only signature can be suppressed in some plain text configurations.
To change your default compose format, go to File > Options > Mail and look for the Compose messages in this format dropdown near the top. Set it to HTML. This is the recommended format for professional email and is the only format that fully supports signatures with formatting, images, and hyperlinks.
\n\n\n\nYou can also check the format of an individual message while composing by clicking the Format Text tab in the ribbon and looking at the format options. If a specific email is in plain text and you want to switch it, click HTML in that ribbon — your signature should then reappear in that message.
\n\n\n\nFix 3 — Check Which Account You Are Sending From
\n\n\n\nIf you have more than one email account set up in Outlook, signatures are assigned on a per-account basis. Each account can have its own signature — or no signature at all. When you compose a new email, Outlook uses the signature for whichever account is shown in the From field.
\n\n\n\nIf you manually change the From address to a different account — either by clicking the From button in a new message or because a reply was addressed to a shared mailbox — Outlook will use that account’s default signature instead. If the secondary account has no signature assigned, you will see nothing.
\n\n\n\nThe fix is straightforward: go back to File > Options > Mail > Signatures and use the Email account dropdown at the top of the Signatures window to switch between accounts. Assign the correct default signature to each account individually. This ensures the right signature appears no matter which account you are sending from.
\n\n\n\nFix 4 — The Signature Was Not Set Up on This Device
\n\n\n\nThis is a very common cause of confusion — and it catches people out whenever they get a new computer, reinstall Windows, or set up Outlook on a second machine. Outlook stores signatures as local files on your PC, in a folder like C:\\Users\\YourName\\AppData\\Roaming\\Microsoft\\Signatures. They are not stored in your Microsoft account or synced to the cloud by default.
This means that if you have moved to a new device, or your PC was wiped and Office was reinstalled, your signatures will not be there. You need to recreate them from scratch. If you still have access to the old machine, you can copy the files from the Signatures folder above and paste them into the same location on the new machine before opening Outlook.
\n\n\n\nIf you need to build a new signature, our guide on how to create an email signature in Outlook walks you through every option, including adding images, formatting, and links. It also covers how to create multiple signatures for different purposes.
\n\n\n\nFix 5 — Signatures in Outlook on the Web Are Separate
\n\n\n\nOne of the most frequently overlooked issues is the distinction between the Outlook desktop application and Outlook on the Web (accessed at outlook.office.com or outlook.live.com). These are two entirely separate applications, and they do not share signature settings. A signature you created in the desktop app will not appear when you access your email through a browser, and vice versa.
\n\n\n\nIf you find your signature is missing when using Outlook in a browser, you need to set it up specifically within the web app. Here is how to do it:
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- Log in to outlook.office.com or outlook.live.com. \n\n
- Click the Settings gear icon in the top-right corner. \n\n
- Select View all Outlook settings at the bottom of the panel. \n\n
- Go to Mail > Compose and reply. \n\n
- Enter your signature in the editor provided and enable the toggle to automatically include it on new messages and/or replies. \n\n
- Click Save. \n
Once saved, this signature will appear whenever you compose email through the browser. It has no effect on the desktop app, so if you use both regularly, you will need to maintain signatures in both places.
\n\n\n\nFix 6 — Check for a Corrupt Outlook Profile
\n\n\n\nAn Outlook profile is the configuration file that stores your account settings, data file locations, and preferences. Over time — or after an interrupted update or unexpected shutdown — a profile can become corrupted. A damaged profile can cause a wide range of erratic behaviour, including signatures disappearing, settings not saving, or the app behaving inconsistently from session to session.
\n\n\n\nCreating a new Outlook profile is often the cleanest fix for persistent, hard-to-explain issues. Here is how to do it without deleting your existing profile:
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- Close Outlook completely. \n\n
- Open the Control Panel and search for Mail. \n\n
- Click Show Profiles. \n\n
- Click Add to create a new profile and give it a name. \n\n
- Add your email account to the new profile and let Outlook configure it. \n\n
- Under When starting Microsoft Outlook, use this profile, select your new profile and click OK. \n\n
- Open Outlook and test whether signatures now behave correctly. \n
If everything works correctly with the new profile, you can continue using it. Your old profile will remain available in the list if you ever need to switch back. Note that you will need to recreate any signatures in the new profile, as they are linked to the original profile’s local files. If you are also experiencing performance problems alongside signature issues, take a look at our guide on Outlook running slow and how to fix it, as a corrupt profile can affect speed too.
\n\n\n\nFix 7 — Signature Missing After an Outlook Update
\n\n\n\nMicrosoft releases regular updates to Outlook as part of Microsoft 365, and while most updates go smoothly, it is not unheard of for an update to reset certain default settings — including the signature assignments. The signature content itself is usually preserved in the local Signatures folder, but the link between your account and the default signature can be lost.
\n\n\n\nIf your signature disappeared after an update, start by going to File > Options > Mail > Signatures and checking whether your signature still exists in the list on the left. If it does, simply reassign it as the default for new messages and replies as described in Fix 1 above. If the signature content has been lost entirely, you will need to recreate it. Check the Signatures folder at C:\\Users\\YourName\\AppData\\Roaming\\Microsoft\\Signatures first — the files may still be present even if Outlook is not referencing them. You may be able to open an old .htm file from that folder to copy the content back in.
It is also worth knowing that if Outlook starts behaving oddly in other ways after an update — such as autocomplete suggestions failing or search not working — these are often related issues. Our article on Outlook autocomplete not working covers how to address those problems separately.
\n\n\n\nFrequently Asked Questions
\n\n\n\nWhy does my signature appear on new emails but not on replies?
\n\n\n\nOutlook controls new messages and replies with separate default settings. If your signature appears when starting a new email but not when replying, it almost certainly means the Replies/forwards dropdown in the Signatures settings is set to none. Go to File > Options > Mail > Signatures and check both dropdowns under Choose default signature — set the Replies/forwards option to your preferred signature.
\n\n\n\nCan I have different signatures for different email accounts?
\n\n\n\nYes, absolutely. In the Signatures window, use the Email account dropdown at the top to switch between your accounts. Each account can have its own signature assigned for both new messages and replies. This is useful if you manage a personal and a business inbox in the same Outlook profile and want each to present differently.
\n\n\n\nWhy does my signature look different when the recipient receives it?
\n\n\n\nSignatures are rendered by the recipient’s email client, not yours. If your signature uses a custom font, the recipient’s client may substitute a different one if they do not have it installed. Images in signatures can also be blocked by the recipient’s security settings, making them appear as broken images or blank spaces. For maximum compatibility, use system fonts such as Arial or Calibri, and host any images online rather than embedding them directly.
\n\n\n\nDo Outlook signatures sync between devices?
\n\n\n\nNo — not automatically, and not through your Microsoft account. Outlook desktop app signatures are stored locally on each machine. If you use Outlook on multiple computers, you need to set up your signature on each one independently. The only way to sync signatures across devices is to manually copy the files from the Signatures folder, or to use a third-party signature management tool designed for enterprise deployments. Outlook on the Web has its own signature that is stored server-side and will be consistent across any browser, but it is still separate from any desktop app signature.
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