How to Create an Email Signature: The Complete Guide (2026)

What to include in your email signature

Before you open any settings menu, decide what actually goes in your signature. Most people add too much. The goal is to give the recipient everything they need to reach you and nothing else.

The essential five

These belong in every professional email signature:

• Full name: Use the name on your business card, not a nickname. If you go by a shortened name professionally, that's fine — but be consistent.
• Job title: Be specific. "Senior Account Manager" beats "Sales" every time. Your title tells the recipient how to prioritise your email.
• Company name: Link it to your company website. It's one of the most natural places for a clickable link and it gives context instantly.
• Phone number: One number only. If you have a direct line, use that. Wrap it in a tel: link so it's tappable on mobile.
• Email address: Yes, even though they already have it. When emails get forwarded or printed, your address disappears from the header. Having it in the signature prevents confusion.

Good additions worth considering

• Company logo: Reinforces brand recognition, especially for client-facing roles. Keep it under 200px wide and 20KB in file size.
• LinkedIn profile link: Almost universally appropriate. Recipients often check LinkedIn before or after meetings. Link to your personal profile, not the company page.
• Headshot: Valuable for sales, consulting, coaching, and real estate. Less common in technical or back-office roles. Keep it 80×80px to 100×100px.
• Calendar booking link: A Calendly or Cal.com link saves back-and-forth emails. Only add it if people genuinely need to book time with you.

Things to leave out

• "Sent from my iPhone" — turn this off immediately.
• Environmental disclaimers about printing — they do nothing.
• Inspirational quotes — unless you're specifically known for thought leadership.
• Animated GIFs — most email clients block or strip them.
• More than three social media icons — eight icons in a row looks desperate.
• Long legal disclaimers on personal emails — these belong only on regulated communications.

Want to see what a well-balanced signature looks like before you build yours? The NeatStamp examples gallery has real signatures across different industries and roles. The templates page is also a good reference for proportion and layout.

Before you build: two approaches

You have two real options for creating an email signature:

For most people, Option B is the right call. The time you save isn’t just the build time — it’s all the debugging time when Outlook renders your carefully crafted CSS as garbage.

If you want to understand the HTML side in depth, the HTML email signature guide covers the technical specifics. For now, let’s walk through each email client.

How to create a signature in Gmail

Gmail is the most-used email client in the world, and its signature editor is surprisingly capable — as long as you know its quirks. The main one: Gmail strips CSS classes and external stylesheets. Everything must be inline.

Step-by-step for Gmail on desktop

1. 1

   Open Gmail Settings

   Click the gear icon in the top-right corner of Gmail, then click "See all settings."

2. 2

   Find the Signature section

   Scroll down on the General tab until you see the Signature section. Click "Create new" and give your signature a name.

3. 3

   Choose your input method

   For a basic text signature, type directly into the editor. For an HTML signature with formatting, click the source code icon (looks like <>) if your browser's Gmail shows it — or use the workaround below.

4. 4

   Paste your signature

   If you've generated your signature in NeatStamp or another tool, copy the rendered version (not the raw HTML) and paste it directly into the Gmail signature box. Gmail preserves the formatting when you paste rendered HTML.

5. 5

   Set when it appears

   Scroll down to "Signature defaults." Set your signature for both new emails and replies/forwards. For replies, you can choose a shorter version if you have one.

6. 6

   Save and test

   Click "Save Changes" at the bottom of the settings page. Compose a new email to yourself and check how it renders. Send it to a colleague on Outlook too.

For a dedicated deep-dive, the Gmail email signature guide covers these issues with specific fixes. If mobile Gmail is your main concern, the mobile-friendly signature guide has more detail.

How to create a signature in Outlook

Outlook is where most signature problems happen. It uses Microsoft Word’s rendering engine rather than a browser, which means many standard HTML and CSS properties simply don’t work. Here’s how to navigate it.

Outlook desktop (Windows)

1. 1

   Open Signature settings

   Go to File → Options → Mail → Signatures. Or, when composing a new email, click Insert → Signature → Signatures.

2. 2

   Create a new signature

   Click "New" and give it a name. You can create multiple signatures — useful for different email accounts or different contexts (new emails vs. replies).

3. 3

   Insert your signature

   For a basic signature, type it in. For an HTML signature: close the dialog, create a new email, paste your HTML signature there, select all, copy, open the signature dialog again and paste it into the signature field. This preserves the HTML formatting.

4. 4

   Set defaults

   At the top right of the Signatures dialog, choose which email account and when to apply each signature (new messages, replies/forwards).

5. 5

   Test in Outlook itself

   Compose a new email and check how it looks. Send it to a Gmail account too — your recipients may use Gmail and you want to see it from their perspective.

Outlook on the web (outlook.com / Office 365)

1. 1

   Open Settings

   Click the gear icon in the top right, then click "View all Outlook settings" at the bottom of the panel.

2. 2

   Navigate to signatures

   Go to Mail → Compose and reply → Email signature.

3. 3

   Add your signature

   Paste your signature into the editor. Outlook on the web has a slightly better HTML editor than the desktop app — it handles some CSS properties that the desktop version ignores.

4. 4

   Save

   Click Save. Set it as default for new emails and/or replies.

NeatStamp generates Outlook-compatible signatures automatically — the code uses table-based layout and inline styles that work reliably in every Outlook version. For more troubleshooting, the Outlook signature guide and the Outlook 365 guide cover the differences between versions.

How to create a signature in Apple Mail

Apple Mail handles HTML signatures differently from Gmail and Outlook. The built-in signature editor only supports plain text. To get an HTML signature into Apple Mail, you need to replace the signature file directly on your Mac.

The simple method (plain text)

1. 1

   Open Mail → Preferences (or Settings) → Signatures.

2. 2

   Select your email account on the left.

3. 3

   Click the + button to create a new signature.

4. 4

   Give it a name, then type your signature in the text box.

5. 5

   Drag the signature to your email account if it doesn't appear there.

The HTML method (for formatted signatures)

Apple Mail stores signatures as .mailsignature files. You can replace the contents of these files with your HTML signature. Here’s how:

1. 1

   Create a placeholder signature

   Follow the simple method above to create a signature called something like "My HTML Sig." This creates the .mailsignature file on disk.

2. 2

   Quit Mail

   Mail must be closed before you edit the file. Fully quit it (Cmd+Q).

3. 3

   Find the signature file

   In Finder, press Cmd+Shift+G and go to: ~/Library/Mail/V10/MailData/Signatures/ (the V number may differ — V9, V10, etc. depending on your macOS version).

4. 4

   Open the .mailsignature file

   Find the file with the most recent modification date — that's your new signature. Open it in a text editor (TextEdit, VS Code, etc.).

5. 5

   Replace the HTML

   The file has a header section and a body section. Replace the body content between the <body> tags with your HTML signature from NeatStamp.

6. 6

   Lock the file

   Right-click the file → Get Info → check the Locked checkbox. This prevents Mail from overwriting your changes when it syncs.

7. 7

   Reopen Mail

   Your signature should now appear with full HTML formatting.

For the full walkthrough with more specifics, the Apple Mail signature guide covers every macOS version from Ventura onwards.

Setting up signatures on mobile

Mobile email apps are more limited than their desktop counterparts when it comes to signature HTML. Here’s what you can do on each platform.

Gmail on iPhone and Android

Gmail mobile has a separate signature setting from Gmail on desktop. They don’t sync automatically.

1. 1.Open the Gmail app → tap your profile picture → Manage your Google Account.
2. 2.Tap the three lines (hamburger menu) → Settings.
3. 3.Select your account → Mobile Signature.
4. 4.Type your signature. Gmail mobile only supports plain text here — no HTML.

Outlook mobile (iOS and Android)

Outlook mobile supports a richer signature than Gmail mobile but is still more limited than the desktop app.

1. 1.Open Outlook → tap your profile picture → Settings (gear icon).
2. 2.Scroll down to Mail → Signature.
3. 3.Toggle "Use signature" on.
4. 4.Edit the signature field. Outlook mobile supports basic formatting (bold, italic, links) but not complex HTML.

Apple Mail on iPhone

1. 1.Open Settings → Mail → Signature.
2. 2.Choose "Per Account" if you want different signatures per email account, or "All Accounts" for one universal signature.
3. 3.Tap the account and type your signature. Plain text only on iOS.

Common mistakes to avoid

I’ve seen the same mistakes repeat across thousands of signatures. Here are the ones that cause the most problems.

For a complete rundown of what a well-designed signature looks like, the email signature best practices guide goes deeper on fonts, colors, image sizing, and industry-specific rules.

Using HTML for better signatures

Plain text signatures look plain. HTML signatures let you add your logo, use your brand colors, include clickable social icons, and generally look like you put some thought into how you present yourself.

The key constraints for HTML email signatures:

• Use table-based layout: Not flexbox, not grid. Tables are the only layout system that works reliably across Outlook, Gmail, Apple Mail, and others.
• All styles must be inline: style="color: #333333; font-family: Arial, sans-serif" on each element. No <style> blocks — Gmail removes them.
• Set explicit image dimensions in HTML attributes: <img width="150" height="50"> — not just in CSS. Outlook ignores CSS dimensions on images.
• Host images externally: Images should be at a public URL, not embedded as base64. Your company website, a CDN, or NeatStamp Pro's hosting all work.
• Test before deploying: Send your signature to accounts on Gmail, Outlook, and if possible an Apple Mail device. The same HTML can look completely different between clients.

The easiest way to handle all of this is to use the NeatStamp editor, which generates table-based, inline-styled, Outlook-tested HTML automatically. You fill in your details, pick a template from the template library, and it produces code you can paste directly into Gmail, Outlook, or Apple Mail.

If you want to go deeper on the HTML specifics, the HTML email signature guide has annotated code examples for every element. The design guide covers fonts, colors, and layout patterns in detail. And the signature size guide has the exact dimensions for logos, headshots, and banners.

Frequently asked questions

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