HTML Email Signature: Complete Guide

Learn how HTML email signatures are built and what keeps them working across email clients.

Email signatures use HTML, but not the same HTML as websites. Tables and inline styles survive Gmail and Outlook; flexbox and external stylesheets do not.

HTML building blocks

Outer table, max 600 px width
Inline CSS on every cell
Hosted images with width/height attributes
System font stack only

Build without writing HTML

Use the email signature generator — it outputs client-safe HTML from templates. Create → Export → paste into Gmail or Outlook.

Tips & Tricks

Email Signature Design: Layout, Colors & Typography

Design email signatures that look polished in every inbox.

Tips & Tricks

Gmail vs Outlook Email Signature HTML: What Breaks and Why

Understand why the same signature HTML renders differently in Gmail and Outlook — and how to fix it.

Tutorial

How to Create a Professional Email Signature (2026 Guide)

A complete step-by-step guide to creating a professional email signature that works in every major email client.

Ready to Create Your Professional Email Signature?

Start using our free AI-powered email signature generator and create a professional signature in minutes.