Email Signature Best Practices: 12 Rules Most People Get Wrong

You send dozens of emails a week, and every single one ends the same way. That little block of text under your name is the most-read piece of marketing you own, and most people set it up once, years ago, and never look at it again.

The good news: a great email signature is not hard. It just follows a handful of rules that the bad ones break. Here are the twelve that matter most, in the order we see people get them wrong.

1. Keep it short (really short)

A signature is a business card, not a résumé. The best ones answer three questions at a glance: who you are, where you work, and how to reach you. Everything else is optional.

A good target is about four lines of text. If your signature is taller than the email you just wrote, it is too long.

2. Lead with your name, not your logo

People reply to people. Put your name first and make it the most prominent thing in the signature, either slightly larger or bold. Your job title and company come right under it, in a quieter color.

3. Choose one way to be contacted first

Listing a desk phone, a mobile, a fax, two emails and a Skype handle feels thorough. In practice, it makes the reader choose. Pick the channel you actually answer and put it first. A second number is fine; five are noise.

4. Never send your signature as one big image

It is tempting to design a signature in Canva and paste the picture. Don't. Many email apps block images until the reader allows them, so your whole signature turns into a grey box. Images also can't be selected, so nobody can copy your phone number, and screen readers read nothing at all.

Use real text for your details and keep images for the things that are truly visual: a photo, a logo, social icons.

5. Use web-safe fonts

Your beautiful brand font only shows if the reader has it installed, which they usually don't. Stick to fonts every computer has: Arial, Helvetica, Verdana, Georgia, Tahoma or Trebuchet. A size of 13 to 15 px reads well on desktop and phone.

6. Limit yourself to two colors

One brand color for your name or a thin accent line, plus a dark grey for everything else, looks more polished than a rainbow. Make sure text has strong contrast with the background so it stays readable for everyone.

7. Host your images, and keep them small

Images in a signature should live on a public https:// address, not be attached to every email. Attached images show up as mysterious files in the recipient's inbox and can trigger spam filters.

Keep each image under about 100 KB and save it at twice the size it will be displayed, so it looks crisp on high-resolution screens. Our email signature size guide has exact dimensions.

8. Add only the social links you use

Social icons are useful when they lead somewhere alive. If your last post on X was in 2021, leave it out. Two or three active profiles beat seven dead ones, and LinkedIn is the one most business contacts expect.

9. Make it work on a phone

A large share of email is read on a phone. Narrow screens squeeze wide layouts, so a signature built from simple tables, around 600 px wide or less, holds up best. Tap targets matter too: links and icons need a little space around them.

10. Check dark mode

Many people read email in dark mode, and every app handles it differently. Some invert your colors, some leave them alone. The classic failure is a black logo on a transparent background that disappears on a dark screen. Preview your signature on a dark background before you roll it out.

11. Keep disclaimers brief

If your company requires a confidentiality notice, keep it to one or two short lines in a small grey font. Wall-of-text disclaimers push your actual message out of view and rarely get read. (Some countries do require company details in business email; see what to include in an email signature.)

12. Use one signature across the whole team

When everyone designs their own signature, a company ends up with twenty fonts and four logos. Pick one layout, share it, and let each person fill in their own details. It looks more trustworthy and takes minutes to update.

A quick checklist before you hit save

• Your name is the first and most visible line.
• Four or five lines of real, selectable text.
• One or two colors, a web-safe font, 13 to 15 px.
• Images hosted online, under 100 KB each, with alt text.
• Tested on desktop, on a phone and in dark mode.

You can build a signature that follows all twelve rules in a couple of minutes with our free email signature generator. Every template uses table-based HTML, inline styles and web-safe fonts, which is exactly what Gmail, Outlook and Apple Mail understand.