Learn · email signature glossary
TL;DR
An HTML email signature is a signature block built with HTML markup rather than plain text. Because it is HTML, it can include a logo, clickable links, custom fonts, colors, and layout, none of which plain text supports. Under the hood it is usually a small table with inline styles, since email clients like Gmail and Outlook strip out stylesheets and modern layout code. You paste it into your email client's signature settings once, and it renders at the bottom of every message you send.
Re: In practice
The difference between plain text and HTML determines what your signature can actually do. A plain text signature is just characters: no logo, no tappable phone number, no brand color. An HTML signature turns every email into a small, consistent piece of company branding. The catch is that email clients render HTML far worse than browsers do, so a signature built like a web page will break in Outlook or Gmail. Signatures that hold up across clients stick to table layouts, inline styles, and absolute image URLs. If your team's signatures look different in every inbox, the HTML is almost always the reason.
Fwd: Worth a look
email signature generator
An email signature generator is a tool that turns your details into ready-to-paste, email-safe HTML, sparing you from hand-coding tables.
inline CSS
Inline CSS puts style rules directly in each HTML tag's style attribute. Gmail and other clients strip style blocks, so email depends on it.
MIME
MIME is the internet standard that lets email carry HTML, attachments, and non-ASCII text. It is why HTML signatures can exist at all.
table-based HTML
Table-based HTML lays out content with table tags instead of divs and CSS grid. It remains the only reliable layout method inside email clients.
HTML email signature
Build a rich HTML email signature that renders perfectly in Gmail, Outlook, and Apple Mail without any coding.
BIMI
BIMI is a DNS-based standard that displays your verified logo next to messages in the inbox. Learn its requirements, including DMARC and a VMC.
Free generator, no account required. Works in Gmail, Outlook, and Apple Mail.
Try Free Generator