Create a professional HTML email signature for Gmail, Outlook, and Apple Mail. Add photo, logo, social links, and custom colors. Free, no signup, no watermarks.
Create My Signature Free →An HTML email signature is a block of HTML code appended automatically to every email you send. It typically contains your name, title, company, contact details, and social media links. Unlike plain text signatures, HTML signatures support formatting, images, and clickable links. They must be built using HTML tables and inline CSS — not modern CSS layouts — because email clients like Microsoft Outlook have limited CSS support.
Every email you send is a touchpoint with a current or potential client. Your email signature is visible in every single one of those touchpoints — making it one of the most consistently seen pieces of branding your business has. A professional signature creates credibility before the recipient even reads your message.
Studies from Newoldstamp and Exclaimer consistently show that emails with professional HTML signatures have higher response rates, more clicks to websites, and generate more inbound calls than emails with plain text or no signatures. For sales and client-facing professionals, a signature with a photo has been shown to increase open rates and build trust — recipients feel they are communicating with a real person, not a faceless company.
Beyond individual performance, consistent email signatures across a team reinforce brand identity and ensure legal compliance in regulated industries. For UK limited companies, including company registration information in email correspondence is legally required under the Companies Act 2006.
Every team member's email reflects your brand identity — same colors, fonts, and messaging.
A website link in your signature generates consistent, free traffic from every email you send.
A calendar booking link or CTA banner turns every email into a lead generation touchpoint.
UK company law requires registration details in business emails. Regulated industries require disclaimers.
Photo, title, and company details signal legitimacy. Critical for cold outreach and first impressions.
LinkedIn and social links allow recipients to verify your credentials and explore your professional history.
An effective email signature is concise but complete. Research from Email on Acid and Litmus shows that signatures with more than 7 lines of information are often ignored or clipped. Here is the optimal structure:
The 3-4 line rule: Keep contact information to 3–4 lines. Signatures with more than 6–7 lines of text are often mentally filtered out by recipients. Include what matters; omit the rest. If your email address is the same as the sender address, leave it out.
Email layouts wider than 600px break on many mobile clients. Our generator outputs signatures up to 520px wide — safe for all major clients including Gmail mobile and iOS Mail.
Your primary brand color, black/dark gray for text, and optionally a separator accent. More than 3 colors creates visual noise and looks unprofessional. Your color picker should be used sparingly.
Use Arial, Helvetica, Georgia, Verdana, or Tahoma. These 5 fonts are pre-installed on all major operating systems. Custom web fonts (Google Fonts, TypeKit) are stripped by virtually all email clients. Our generator uses these fonts exclusively.
Microsoft Outlook 2007–2021 uses the Word rendering engine (version 16) which does not support CSS flexbox, grid, float, or many modern properties. Use HTML tables for layout. This is not a technical limitation of our tool — it is a fundamental constraint of email rendering technology.
Email clients strip <style> tags and external stylesheets. Every CSS property must be applied as an inline style="..." attribute directly on the HTML element. Our generator outputs properly inlined styles.
Outlook 2007+ only displays the first frame of animated GIFs. Many corporate email servers strip GIFs entirely for security reasons.
Always include width and height attributes on all <img> tags. Without them, images may render at full size (breaking layouts) or not render at all.
Before deploying a new signature, test it in Gmail, Outlook (desktop), Outlook Web, Apple Mail, and at least one mobile client. Litmus and Email on Acid offer free trials for email rendering previews.
If you have ever wondered why email signatures and email templates look like they were coded in 2003 — they were. Email clients, particularly Microsoft Outlook, use extremely limited CSS support. This is not changing soon: Microsoft has chosen to maintain the Word rendering engine for Outlook across all versions to ensure backward compatibility with enterprise email systems.
The practical implication: HTML tables are the only reliable way to create multi-column or structured email signature layouts. Here is a comparison of what works and what breaks:
| CSS Property | Gmail | Outlook 2016+ | Apple Mail |
|---|---|---|---|
| HTML tables | ✅ | ✅ | ✅ |
| Inline styles (style="...") | ✅ | ✅ | ✅ |
| CSS flexbox | ✅ | ❌ | ✅ |
| CSS grid | ✅ | ❌ | ✅ |
| CSS float | ✅ | ⚠️ Partial | ✅ |
| <style> block / external CSS | ⚠️ Stripped | ❌ Stripped | ✅ |
| Web fonts (Google Fonts) | ❌ Fallback | ❌ Fallback | ✅ |
| CSS border-radius | ✅ | ❌ | ✅ |
| Animated GIFs | ✅ | ⚠️ First frame | ✅ |
| Base64 images | ✅ | ⚠️ Often blocked | ✅ |
Our generator outputs HTML table-based signatures with all inline styles — the safest approach for maximum compatibility. The HTML code is also provided for you to customize if needed.
Tip: The "Copy Signature" button copies rich HTML to your clipboard — the formatting (bold names, colored lines, clickable links) is preserved when you paste into Gmail's editor. "Copy HTML Code" gives you the raw HTML for use in other contexts.
Tip: If the formatting does not paste correctly, try pasting into Notepad first to strip any clipboard formatting, then use the HTML editor in Outlook (Alt+F9 or Edit Signature → HTML source) to paste the raw HTML code instead.
Tip: If Apple Mail resets your formatting, try this workaround: create the signature file directly. In Finder, go to ~/Library/Mail/V10/MailData/Signatures/ (or similar path for your version). Replace the .mailsignature file content with our HTML code.
Tip: iOS Mail's built-in signature editor is text-only and does not support HTML. For an HTML signature on iOS, use the Gmail or Outlook app instead — both support HTML signatures through their own settings.
Legal requirements for email signature content vary by country and industry. Failing to meet these can result in regulatory penalties or, for companies, fines.
Required: Companies Act 2006: All business emails from UK limited companies must include the company's full registered name, company registration number, registered office address, and country of registration. This is a legal requirement — not including it can result in fines.
Most large firms also include a confidentiality disclaimer, though these are not legally enforceable in the UK courts.
Required: E-Commerce Directive 2000/31/EC: Businesses providing services online must include their registered address, registration number (where applicable), and VAT number in electronic communications including email.
Financial service firms, law firms, and medical practices face additional regulatory disclosure requirements from sector-specific regulators.
Required: No general federal law mandates email disclaimers. CAN-SPAM Act applies to commercial email marketing (not transactional emails). FINRA requires disclaimers in financial communications; HIPAA has requirements for healthcare-related emails.
State bars may require attorney disclosures; financial advisors require SEC/FINRA disclosures.
Required: Telemediengesetz (TMG) §5: Businesses must include company name, registered address, legal form, registration court and number, and VAT ID in all electronic business correspondence. German courts have issued fines for non-compliance.
GmbH and AG companies must additionally state the managing director(s) name.
Yes, if built with HTML tables and inline styles. Microsoft Outlook (all desktop versions from 2007 onwards) renders emails using the Microsoft Word engine, which does not support CSS flexbox, grid, or many modern properties. Signatures built with <table> elements and inline style attributes work correctly across all Outlook versions including Microsoft 365 and Outlook Web Access (OWA).
Gmail strips <style> tags and many CSS properties when displaying emails. Your signature must use only inline styles (style="..." attributes). Gmail also renders images at their natural size if width/height are not explicitly set — always include width and height attributes on all images. Keep signature width under 600px for mobile compatibility.
Width: maximum 600px (scales down on mobile). Height: 100–150px is optimal; over 200px risks being clipped. File size (if using images): under 50KB per image, under 100KB total. Images over 1MB will dramatically slow email loading and may be stripped by corporate email servers.
Copy the signature using "Copy Signature" (rich HTML copy). Then go to Gmail Settings (⚙️) → See all settings → General → Signature → Create new. Click inside the signature text box and press Ctrl+V (Cmd+V on Mac). The formatting is preserved. Scroll to the bottom and click Save Changes.
Desktop: File → Options → Mail → Signatures → New → name it → in the editor, press Ctrl+V → OK. Outlook Web (OWA): Settings gear → View all Outlook settings → Mail → Compose and reply → paste your signature in the Signature field → Save.
Outlook blocks external images and base64-embedded images by default for security reasons. For maximum compatibility, host your logo and photo on your web server (e.g., https://yourdomain.com/logo.png) and reference them with a standard <img src="..."> URL. In corporate environments, IT policies may permanently block all images regardless.
No — or rather, you should not. Web fonts loaded via @font-face or Google Fonts CDN are stripped by virtually all email clients. Stick to web-safe fonts: Arial, Helvetica, Georgia, Verdana, and Tahoma. These are pre-installed on all major operating systems (Windows, Mac, iOS, Android) and render consistently across all email clients.
Yes. Under the Companies Act 2006, all business emails sent by UK limited companies must include: the company's full registered name, registered office address, company registration number, and the country of registration. This is a legal requirement, not optional. The information typically goes in the email footer / disclaimer section of the signature.
Free HTML email signature generator. Works in Gmail, Outlook, and Apple Mail. No signup, no watermarks.
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