Gmail Signature Not Working? 8 Fixes That Actually Work

Fix 1: Signature not saving — browser cache and the incognito test

If you edit your Gmail signature, click Save, and it either reverts to the old version or shows blank next time you open settings, browser cache is the most likely cause. Gmail’s settings interface is a web app, and like any web app, it can get stuck showing a cached version that doesn’t reflect your latest changes.

The incognito test

Open an incognito/private window (Chrome: Ctrl+Shift+N, Firefox: Ctrl+Shift+P, Edge: Ctrl+Shift+N). Sign in to Gmail. Go to Settings → General → Signature, make your change, and save. Close the incognito window, then open a regular window and check if the change is reflected. If it saved correctly in incognito but not normally, the issue is either cache or a browser extension (see Fix 7).

Hard refreshing Gmail

Sometimes a hard refresh is enough to clear the cache without going incognito. While Gmail is open, press Ctrl+Shift+R (Windows/Linux) or Cmd+Shift+R (Mac). This forces the browser to reload all assets from the server rather than from cache.

Clearing Gmail’s application cache

For a more thorough cache clear in Chrome: open chrome://settings/clearBrowserData, set the time range to “Last 7 days” (not All Time, unless you want to clear everything), check “Cached images and files,” and click “Clear data.” Then reopen Gmail and try again.

If none of this works, move on to Fix 7 (browser extension conflict) — that’s the second most common cause of Gmail settings not saving.

Fix 2: Signature not showing on replies

This is a setting you have to deliberately turn on in Gmail — it’s off by default for replies. The signature shows in new composed emails but not when you hit Reply or Reply All. This catches almost everyone at some point.

Where to find the setting

1. Open Gmail and click the gear icon (top right).
2. Click “See all settings”.
3. Stay on the General tab. Scroll down to the Signature section.
4. Under your signature editor, find the checkbox: “Insert this signature before quoted text in replies and remove the “--” that precedes it.” Check that box.
5. Scroll all the way to the bottom of the Settings page and click Save Changes.

Once this is set, open an existing email thread, hit Reply, and confirm your signature appears above the quoted text. The Gmail signature setup guide has screenshots of this entire process if you want a visual reference.

Fix 3: Signature pasted as plain text — formatting stripped

If you’re copying your signature from the NeatStamp editor or another source and it looks perfect in the preview but plain and unformatted after you paste it into Gmail, the paste method is almost certainly the issue.

Gmail’s signature editor supports two types of paste:

Also watch out for this: if you copied your signature from a rendered web page or PDF, the formatting metadata may not survive the clipboard transfer even with Ctrl+V. Always copy from a source that has rich clipboard data — the NeatStamp editor’s “Copy for Gmail” button is specifically designed to put the right clipboard data for Gmail’s editor.

If you only see the HTML source code instead of the formatted signature

This means you’ve pasted raw HTML (the code) rather than the rendered version. Gmail’s signature editor is a visual editor, not a code editor — it doesn’t accept HTML tags directly. You’d need to render the HTML first (open it in a browser, then copy from there) or use NeatStamp’s one-click Gmail install.

The NeatStamp editor has a dedicated “Install in Gmail” button that handles the rendering and paste steps for you automatically.

Fix 4: Gmail mobile app — it’s a completely separate signature

This trips up almost everyone who emails from both a computer and a phone. Your Gmail signature set in desktop Gmail (via Settings in the browser) is completely separate from the signature set in the Gmail app on your phone. They don’t sync. Changing one has zero effect on the other.

Additionally: Gmail mobile signatures are plain text only. The mobile app doesn’t support HTML signatures. So even if you copy your beautifully formatted desktop signature and paste it into the mobile app settings, it will appear as plain text.

Setting your signature on the Gmail mobile app (iOS)

1. Open the Gmail app. Tap the hamburger menu (three lines, top left).
2. Scroll to the bottom and tap Settings.
3. Tap the email account you want to set the signature for.
4. Tap Mobile Signature.
5. Type your plain text signature and tap the checkmark to save.

Setting it on Android

Same path: open Gmail → menu (three lines) → Settings → your account → Mobile Signature. The setting name and location are identical.

Since you can’t use HTML on mobile, write a clean plain-text version: name, title, company, phone, and maybe your website URL. Keep it to 4–5 lines. If it’s any longer, it starts to feel heavy in the context of a quick mobile reply.

Fix 5: Gmail stripping formatting — the 10KB signature limit

Gmail enforces a 10KB limit on the HTML content of a signature. If your signature HTML exceeds this limit, Gmail will silently truncate it. You may see the formatting suddenly stop partway through, or the signature may revert to plain text entirely. There’s no warning — it just stops working.

How signatures end up over 10KB:

• Base64-encoded images: A 15KB logo becomes 20KB+ of base64 text, immediately blowing the limit.
• Excessive inline CSS: Repeating long style attributes on every element (e.g., declaring the same font-family and color on 20 different tags) adds up fast.
• Pasting from Word or another rich source:Microsoft Word adds enormous amounts of proprietary markup when you copy from it. Pasting Word content into Gmail’s editor can inject invisible XML tags that balloon the source size.
• Long legal disclaimers: If your company adds a legal disclaimer inline in the signature (rather than at the server level), the text itself can add several KB.

To check: right-click on your signature in the Gmail compose window, choose “Inspect”, and look at the HTML source. Alternatively, paste your signature HTML into a text editor and check the file size (should be well under 10KB as a .txt file).

NeatStamp signatures are optimized to stay well under this limit. If you’re building your own HTML, the email signature size guide has detailed guidance on keeping HTML lean.

Fix 6: Multiple accounts — editing the wrong account’s signature

If you have multiple Google accounts signed in (or multiple email aliases on the same account), Gmail stores a separate signature for each one. It’s very easy to open Settings and edit the signature for the wrong account without noticing.

Multiple Google accounts

Check which account you’re currently viewing. In Gmail, look at the top-right corner — your profile picture or initial shows the active account. If you have multiple accounts, each has its own Settings. To access Settings for a specific account, make sure that account is active (click the profile picture and switch) before opening the gear icon.

Multiple aliases on one account

Gmail supports sending from email aliases (a different From address than your main Gmail address). If you have aliases set up, Gmail lets you assign a different signature to each alias. In Gmail Settings → General → Signature, there’s a dropdown at the top of the signature section showing which address the signature is assigned to. If this is set to one alias but you’re sending from another, you’ll get the wrong signature (or no signature).

Fix: create a signature for each alias you send from, or set a default that applies to all. The alias signature dropdown says “(No signature)” by default for any aliases you haven’t configured.

The Gmail email signature guide has a section on alias signatures with screenshots showing exactly where to find and configure each one.

Fix 7: Browser extension conflict

Several types of browser extensions are known to conflict with Gmail’s signature editor: ad blockers, privacy extensions, clipboard managers, grammar checkers (like Grammarly), and email productivity tools (like Boomerang, Mixmax, or Streak). They can prevent signatures from saving, strip formatting on paste, or interfere with how Gmail renders the signature in compose windows.

How to isolate the problem

1. Open an incognito window (Ctrl+Shift+N). Extensions are disabled by default in incognito.
2. Sign into Gmail in that incognito window and test your signature. If it works perfectly here, an extension is the cause.
3. In your regular Chrome window, go to chrome://extensions.
4. Toggle off all extensions, then reload Gmail and test again.
5. Re-enable extensions one at a time, testing Gmail each time, until the problem reappears. The last extension you enabled is the conflict.

Common culprits: Grammarly modifies text fields aggressively and sometimes conflicts with Gmail’s rich text editor. uBlock Origin or similar ad blockers can block scripts that Gmail uses to manage signatures. Email extensions like Streak can intercept signature injection.

Once you’ve identified the extension, check if it has a “disable on this site” option. Most extensions let you right-click their icon and choose to disable on specific sites — disable it for mail.google.com only.

Fix 8: Google Workspace admin restriction

If you’re on a company Google Workspace (formerly G Suite) account, your admin may have restricted or locked email signature management. This can take two forms:

Form 1: Signature settings locked. The admin has used Google Workspace Admin Console → Apps → Google Workspace → Gmail → User Settings to restrict users from modifying their signatures. If this is the case, the signature field in your Gmail Settings may be greyed out or missing entirely.

Form 2: Append-only signatures.Google Workspace admins can set up company-wide footer signatures that get automatically appended to every outgoing email at the server level. You may not see this in your own sent mail (it’s added after the email leaves your client), but recipients see it. If you’re also setting your own signature, your recipients may end up seeing two signatures.

What to do

If you suspect an admin restriction, talk to whoever manages your company’s Google Workspace. Ask specifically:

• “Is email signature editing restricted for my account?”
• “Is there a company-wide footer signature being appended to outgoing emails?”
• “Can my user account be granted permission to set my own signature?”

If you need a signature template that your IT admin can deploy company-wide, the NeatStamp editor can generate the HTML. Pair that with the Apple Mail signature guide if some of your team uses Macs.

Frequently asked questions

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