HTML vs Plain Text Email Signatures: Which Should You Use?

Two ways to end an email

Every email signature is built one of two ways: as HTML, with formatting, images and clickable links, or as plain text — just characters, no styling. Both are legitimate, and the "right" choice depends on what you value most. Here is an honest comparison so you can decide with your eyes open.

What each one actually is

A plain text signature is exactly what it sounds like: your name, title and contact details typed as ordinary text. No fonts, no colours, no logo. It looks the same everywhere because there is nothing to render differently.

An HTML signature is a small piece of web code. It can include a logo, brand colours, a headshot, social icons and links styled as buttons. It is what most people picture when they think of a "professional" signature.

The case for HTML

• Branding. A logo, colour and consistent layout make you look established and tie every email to your identity.
• Clickable links. Your website, email and social profiles become one-tap destinations rather than text people have to copy.
• Hierarchy. You can make your name prominent and your legal disclaimer quiet, guiding the reader's eye.
• Calls to action. "Book a call" or "View listings" as a styled link is far more inviting than a bare URL.

For anyone in sales, real estate, consulting or any client-facing role, these advantages usually make HTML the default choice.

The case for plain text

• It renders identically everywhere. No broken images, no collapsed layouts, no dark-mode surprises. What you type is what they see.
• It is lightweight. Nothing to load, nothing to attach, no images bloating a reply thread.
• It is friendlier to deliverability. Image-heavy signatures can nudge spam filters; plain text never does.
• It is accessible by default. Screen readers handle it perfectly, and it survives in any client, however old.
• It suits certain cultures. Developers and many technical communities prefer plain text, and some mailing lists strip HTML anyway.

Plain text never breaks — because there is nothing in it that can break. That reliability is its whole appeal.

Where HTML goes wrong

HTML's strengths are also its risks. Email clients are inconsistent: Outlook, Gmail and Apple Mail each interpret HTML differently, and a signature that looks perfect in one can misalign in another. Images can arrive as attachments and trigger a paperclip, get blocked by the recipient's client, or vanish in dark mode. None of this is fatal, but it means an HTML signature has to be built carefully and tested — you cannot just assume it works.

Where plain text falls short

Plain text buys reliability by giving up everything visual. No logo, no colour, no headshot, no styled call to action. Links may or may not be auto-detected as clickable depending on the client. For a brand that lives or dies on visual identity, that is a real cost. A plain text signature says "functional"; it rarely says "memorable".

Do you have to choose?

Not entirely. Well-built HTML emails include a plain text version behind the scenes (the "multipart" standard), so clients that cannot or will not display HTML fall back to readable text. A good HTML signature is really HTML with a sensible text fallback — which is why the quality of the build matters so much. A carelessly coded signature falls apart on fallback; a well-coded one degrades gracefully.

How to decide

• Choose plain text if you email mostly technical audiences, care above all about deliverability and universality, or simply prefer minimalism.
• Choose HTML if branding, clickable contact details and a professional visual impression matter to your work — which, for most businesses, they do.

For the majority of professionals, HTML is the right call, provided it is built properly: hosted images, web-safe fonts, high contrast, and testing across the major clients.

Get HTML that behaves like plain text should

The whole point of a good builder is to give you HTML's polish without HTML's fragility. Sigmint generates signatures with hosted images (so nothing becomes an attachment), web-safe fonts, and layouts tested in Outlook, Gmail and Apple Mail — the careful build that separates an HTML signature that works from one that breaks. You can try the builder, and if you prefer to keep things simple, you can always dial the design back to the essentials. Either way, the goal is the same: a signature that looks right in every inbox it reaches.