The average professional sends about 40 emails per day. That is 40 times your email signature appears in someone's inbox, on their screen, right after whatever you just wrote. Over a month, that is roughly 800 impressions. Over a year, somewhere around 10,000.
Most people fill this space with an inspirational quote they found in 2014, four social media icons nobody clicks, and a phone number they send to voicemail anyway.
Your email signature is a micro-billboard. Every time you send an email, you are running an ad. You are just not being intentional about what the ad says.
What Actually Belongs in a Signature
Keep it to four or five lines maximum. Every element should earn its place.
Your name. Obviously.
Your title or one-line description of what you do. Not your full job title if it is one of those compound monstrosities that HR invented. "Product Designer" beats "Senior Associate Product Design Specialist II."
One link. Not five. One. The thing you most want people to click. Your portfolio, your company, your latest project, your calendar booking link. Pick the one that matters most right now. You can change it quarterly.
One call to action, if appropriate. "Currently booking Q2 consulting" or "New guide: 7 Landing Page Mistakes" or whatever you are promoting. This is the part most people miss. A link without context is ignorable. A link with a reason to click gets traffic.
That is it. Four lines. Name, title, one link, one CTA.
What to Cut
Inspirational quotes. Nobody reads them. The people who do read them have seen the Gandhi quote before. It does not make you look thoughtful. It makes your signature six lines longer.
Your phone number, unless you actually answer it. If every call goes to voicemail and you respond by email anyway, the phone number is taking up space and training people to use a channel you do not monitor.
Multiple social media icons. LinkedIn, Twitter, Instagram, GitHub, YouTube, TikTok, your podcast. Each one you add dilutes the others. If someone wants to find you on Instagram, they will search for you. Put the one platform where you are most active. Drop the rest.
Your company's legal disclaimer. I understand that some corporate environments require these. If yours does, there is nothing you can do. But if it is optional, know that those eight-line disclaimers about confidentiality have been tested in court and they carry almost no legal weight. They exist because a lawyer wrote one once and then everyone copied it.
Sent from my iPhone. Some people leave it on deliberately because it signals the email was dashed off quickly, which sets low expectations for typos and brevity. But if you are trying to appear professional, remove it and replace it with your actual signature on mobile too.
HTML vs Plain Text
HTML signatures let you include formatting, colors, links, and images. Plain text signatures work everywhere, in every client, on every device, with zero rendering issues.
I lean toward minimal HTML. A name in slightly larger text, a link that is actually clickable, and that is about it. The more complex your HTML signature, the more likely it is to break in Outlook, get stripped by a mailing list, or render as a mess of code in someone's plain text client.
If you go the HTML route, test it in Gmail, Outlook, Apple Mail, and on mobile. What looks clean in your client might look broken in theirs.
Why Image Signatures Are a Problem
Some people design their entire signature as an image. It looks great in the original email. Then it gets forwarded and the image breaks. Or the recipient's client blocks images by default and they see a red X where your contact info should be. Or someone tries to copy your email address from the signature and they cannot because it is embedded in a PNG.
Images in signatures also get flagged by spam filters more often and they are not accessible to screen readers.
If you want a logo, include it as a small image alongside text-based contact info, not instead of it.
Mobile Rendering
More than half of emails are opened on mobile devices. Pull up your signature on your phone right now. If it is wider than the screen, or if the text is too small to read, or if the links are too close together to tap accurately, you have a problem that is affecting every email you send.
Keep signature lines short enough to display on a mobile screen without wrapping awkwardly. Use a font size that is readable without zooming. Make sure tappable links have enough spacing between them that a thumb can hit the right one.
The simplest test: send yourself an email and read it on your phone. Most people have never done this with their own signature.
A/B Testing Your CTA
If you include a link in your signature, use a trackable URL. A simple UTM parameter works. Create two versions of your CTA, run one for two weeks, switch to the other for two weeks, and compare clicks.
I have seen people double their signature click-through rate just by changing the CTA from a generic "Visit my website" to something specific like "Free template: project proposal outline." Specificity outperforms vagueness in every channel, and email signatures are no different.
The thing about a signature is that you set it once and forget it for months. That is exactly why it is worth spending thirty minutes getting right. Thirty minutes of effort, ten thousand impressions over the next year. There are very few things in professional life with that kind of effort-to-exposure ratio.
I'm Michael Lip. I build free developer tools at zovo.one. 350+ tools, all private, all free.
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