How to Make a Professional Email Signature for SaaS

Every email you send ends with the same few lines. Most people write them once and never look again. That is a waste, because those lines are the one part of your email you control for every prospect, every customer and every stranger you write to.

Most guides to business email signatures agree on the basics and then stop. Few of them answer the question a SaaS team actually has: which one link should go in there? So this post covers the basics quickly, then spends its time on that link.

The four lines every signature needs

Start with the part everyone agrees on. A signature needs your full name, your job title, your company, and one other way to reach you, such as a phone number, a booking link or a LinkedIn profile. Everything else is optional. Titles matter most when you write to someone new, because they tell the reader how much weight your message carries.

Write these lines as real text, not as a picture. Two reasons:

• Classic Outlook is set by default to block automatic picture downloads. A signature that is only an image can show up empty.
• A signature that is one flat image can't be copied from, and its links don't work as separate clickable elements, according to Exclaimer, a company that sells signature software.

A small logo is fine if the details are also in text. If you use one, Google recommends a signature image 70 to 100 pixels high by 300 to 400 pixels wide. The image also counts toward Gmail's limit of 10,000 characters per signature, which is why a signature with four short lines can still throw an error.

How long should it be?

You will read "three to four lines" everywhere. Where does that rule come from? EmailAnalytics checked Google, Microsoft and Apple documentation and found that none of them recommends a length; Google's published limits are the image sizes and the 10,000 characters. The "three to four lines" rule is opinion.

It is good opinion, though. The more lines you add, the less each line is read. The U.S. Chamber of Commerce's advice is to be strategic about links, because too many make a signature look cluttered. My rule is simpler: if a line does not help a stranger decide what to do next, cut it.

Pick one link

This is the part most guides skip. Every extra link in your signature competes with the others. If you list your website, LinkedIn, X, a blog, a podcast and a calendar, the reader picks none of them.

EmailAnalytics puts it plainly: one call to action is worth including if it points somewhere specific, and a generic homepage link adds length without changing behavior.

So ask one question: after reading my email, what is the one thing I would like this person to do next? The answer depends on your job:

A plain founder or sales signature can look like this:

Your Name
Head of Sales, Your Company
yourcompany.com · +1 555 0100
Book a demo · Watch a Demo

Four lines. The last one has two links. That looks like a break from "pick one", so here is the reasoning: they are two doors to the same next step, which is a conversation, and the reader picks the one that suits them.

Why "Book a demo" is not enough

"Book a demo" asks a stranger to put a meeting on their calendar and talk to a salesperson. Some prospects are ready for that. Many are not, and they have nowhere to go.

Gartner surveyed 646 B2B buyers in August and September 2025 and found that 67% say they prefer a rep-free experience. That is a survey of what buyers say they prefer, not a count of what they do. It also does not mean buyers never want to talk to you. But it does say that if your only door is a calendar, you are asking for a lot on the first visit.

A second link can be a second door. "Book a demo" is for the person who is ready to talk. The other link is for the person who wants to look first.

Add "Watch a Demo" beside it

This is the part that is DemoSix's own, so I will describe exactly what it does today, and nothing more.

Capture Leads gives you a "Watch a Demo" link for your email signature. Here is what happens when a prospect clicks it:

1. They land on a page with your branding.
2. They enter their name and email. They do not need a DemoSix account.
3. They watch the demos you chose to show them, in their browser.
4. You see who watched which demos and how far they got, and you can export every lead to CSV.

The demos behind the link are the ones in your DemoSix library, organized into Channels. Published demos run up to about six minutes, so a prospect can see something real without committing half an hour. If you are connecting this to a CRM, GoHighLevel and HubSpot connect directly, and on Teams, Zapier can send leads to Salesforce and thousands of other apps.

A few details worth knowing before you use it:

• The link says "Watch a Demo" to start with. You can reword it in your email client, and the address behind it stays the same. In a plain-text signature, the address itself is pasted.
• Prospects agree before they watch. They agree to share their details and viewing activity and to receive your marketing emails.
• You choose what the link opens. It opens only the channels you select. A channel you leave out is not opened by the link.
• You can kill a link. If a link has gone further than you wanted, reset it and the old address stops working.
• It is on every plan. Basic has one signature link and 50 new leads a month, free. Standard and Teams have unlimited leads, 5 and 10 links, and a link for each rep (10 and 50). The pricing page has the current plans.

A signature also can't hold a video. Exclaimer notes that embedding a video file in a signature does not work in most email clients and suggests a link instead. That is the case for a library: the signature stays four lines, and the video lives behind the link.

What goes behind it matters more than the button. Put the demo you would give in the first ten minutes of a sales call. If you only have one, start with one. The point is that a prospect who clicks should see something useful right away.

Three checks before you hit save

1. Make a shorter version for replies. In a long thread, a full signature on every message gets in the way. Exclaimer suggests a larger version for new conversations and a simplified one for replies and forwards. Gmail lets you set a signature default for new emails and for replies.
2. Set your phone separately. In Gmail, a mobile signature applies only to emails you send from the Gmail app. If you do not create one, new messages use the signature from your computer. Send yourself a test from your phone.
3. Look at it with images turned off. That is how readers on classic Outlook see it by default. Your name, role and links should all still make sense.

Then review it when your title or your offer changes. A signature is pressed onto every message you send, so an old title or a dead link goes out with each one.

The takeaway

A good business email signature is short: name, role, company, and one way to act. For a SaaS team, the best way to act depends on where the reader is. Some are ready to talk. Some want to look first. Give both a door, keep the rest of the signature quiet, and check each link opens where you think it does.