How to create a professional email signature in 2026

Creating a professional email signature is an exercise in restraint. The temptation is to put in everything you have — three numbers, five social networks, a strapline, a logo, a photo, a disclaimer — and the result is a slab nobody reads. Here are the decisions to make, in the order they arise.

1. Decide what the signature has to enable

A signature answers a precise question: how do I get back to this person, and on whose behalf are they writing? Anything that does not serve that is noise.

In practice, that gives four blocks, and no more: identity (name, job title), affiliation (company, possibly subsidiary), one direct means of contact, and the legal layer if your business requires it. What deserves a place is worked through in what to put in an email signature.

2. Rank rather than align

A readable signature has a single visual entry point: the name. It is the largest, the boldest, the darkest. Everything else steps down a level.

A hierarchy that works: name at 15–16 px bold, job title and company at 13–14 px in mid grey, contact details at 12–13 px, legal notices at 10–11 px in light grey. Three size levels, two greys. Beyond that, the eye stops distinguishing anything.

3. Fix the width before anything else

This is the structuring constraint, and the one people forget. A signature designed on a wide screen falls apart on a phone.

Aim for 500 to 600 px wide maximum. That is what travels everywhere, including in a narrow reading pane and on a 390 px screen. Beyond that, the mobile client forces horizontal scrolling or shrinks everything until it is unreadable.

That constraint also settles the column question: two at most — typically a logo on the left, information on the right — never three.

4. Keep text as text

This is the least respected and most costly rule. Exporting the whole signature as an image seems to solve every rendering problem. In reality it creates three.

Email clients block remote images from unknown senders by default: your recipient sees an empty rectangle where your contact details should be. The text is neither selectable nor copyable: there is no way to grab a number. And screen readers have nothing to announce.

Only the logo, the social icons and the campaign banner are images. The rest is HTML text.

5. Handle the logo properly

The logo is the element that breaks most often. Four conditions to meet: a public HTTPS URL, never a local file; dimensions carried by the HTML width and height attributes, not only in CSS; an export at twice the display size to stay sharp on high-density screens; an alt attribute with the company name.

The detail is in adding a logo without breaking it and, for weight and format questions, in logo size and format.

6. Limit the palette and the fonts

One accent colour, borrowed from your brand, applied to a single element: a separator rule, or the website link. The rest in black and grey.

One font, and a system font — Arial, Helvetica, Georgia. Web fonts do not load reliably in email clients; the recipient will see a substitute anyway. You may as well choose it.

7. Choose social links sparingly

Three icons maximum, and only genuinely active accounts. A link to an X account abandoned in 2022 does you more harm than good.

The icons should be linked images, sized at 20–24 px, with an explicit alt. And they point to the company’s accounts, unless your organisation explicitly encourages personal ones.

8. Handle legal notices without suffering them

Depending on your business and legal form, certain information is mandatory on your commercial communications. It belongs at the foot of the signature, small, in light grey — readable without dominating.

The subject, often misunderstood, is covered in mandatory legal notices.

9. Think template, not signature

This is the decision that separates an improvised signature from a company one. If you build a block for yourself, you will have to rebuild it forty times, and rebuild it again at the next brand change.

A template replaces personal information with dynamic fields — name, job title, phone — filled from the directory at send time. The same model then serves the whole organisation, each person seeing their own data, and a brand change propagates in a single operation.

That is the principle of the Signally editor, freely available: you create your signature, test it, and then decide whether you want to deploy it company-wide.

Worth knowing: before distributing a template, preview it at minimum on Outlook for Windows, Gmail web and a mobile client. Those are the three environments where discrepancies show up first, and a preview takes two minutes.