Your email signature appears at the bottom of every message you send. A good one reinforces your professionalism, makes it easy to contact you, and strengthens your brand. A bad one -- cluttered with quotes, broken images, and six social links -- does the opposite. This guide covers what to include, what to skip, sizing rules, design principles, and platform-specific tips for Gmail, Outlook, and Apple Mail.
Every email signature needs these four elements. They answer the question: “Who is this person, and how do I contact them?”
Your first and last name. This is the single most important element. It should be the most prominent text in the signature, typically 14-16px bold.
Your role and organization name. This tells recipients who they are dealing with and provides context for the conversation.
Your professional email. Seems redundant, but makes it easy to copy, share, and find when the email is forwarded to someone new.
Your direct line or mobile. Essential for sales, support, and client-facing roles. Optional for internal-only positions.
Add these based on your role, industry, and brand needs. Include only what serves the recipient.
When brand visibility matters
Reinforces brand recognition. Use a small, optimized image (100-250px wide, under 200KB) hosted on an HTTPS CDN. Skip it if file size or rendering is a concern.
Client-facing roles
Builds personal recognition and trust. Works well for sales, real estate, consulting, and other client-facing roles. Use a professional photo, 80x80px, under 50KB.
When you actively maintain the profiles
LinkedIn and your company website are the most useful. Use small icon images or text links. Limit to 1-2 links max -- every additional link dilutes the others.
Sales, marketing, business development
A promotional banner for a product launch, event, or demo. Under 480px wide and 100KB. Effective for sales and marketing, but skip it for formal or legal roles.
Inclusive and modern workplaces
Increasingly common and appreciated in inclusive workplaces. Add them after your name or on the title line. e.g., 'Sarah Johnson (she/her)'.
Regulated industries
Required in some industries (legal, healthcare, finance). Keep it short, use 10px font, and place it at the bottom of the signature separated from the main content.
Follow these dimensions to keep your signature compact, fast-loading, and compatible with every email client.
A well-designed signature follows these principles. The goal is a clean, scannable block that looks intentional.
These are the most frequent email signature mistakes we see. Each one hurts your credibility, distracts the recipient, or breaks your signature in certain email clients.
Inspirational quotes
A quote below your signature dilutes your professional message and adds unnecessary length. Your recipients did not ask for life advice. If you want to express personality, do it through your email writing style, not a borrowed quote.
Too many social links
Five or six social icons create visual clutter and make it harder for the recipient to find the one link that matters. Stick to LinkedIn and your company website. If none of your social profiles are professionally relevant, skip them entirely.
Animated GIFs
Animated GIFs increase file size, look unprofessional in most business contexts, and are blocked or rendered as static images in Outlook desktop. They also make your signature look like a banner ad.
Oversized images
Images over 200KB slow down email loading, especially on mobile. Some email clients block large images entirely. Always optimize your logo and photo before adding them to your signature.
Inconsistent team signatures
When every team member uses a different signature style, it undermines your brand. Even a five-person team should use consistent colors, fonts, and layouts. Tools like BrandFooter handle this automatically.
Each email client has its own quirks when rendering HTML signatures. Here are the key things to know for the most popular platforms.
Common questions about email signature best practices.
Three to five lines of text is the sweet spot. That covers your name, title, company, phone number, and a link. Some roles may need a sixth line for a disclaimer or CTA, but anything beyond six lines is usually too long. Recipients scan signatures in seconds, so brevity matters more than completeness.
Yes. It seems redundant since the recipient already has your email in the 'From' field, but including it in the signature makes it easy to copy and share. When your email is forwarded to a third party, the original 'From' address is not always visible, but the signature is.
Many professionals use a shorter signature for replies and forwards -- just their name and phone number -- to avoid cluttering long email threads. Both Gmail and Outlook support separate signatures for new emails versus replies. Use your full signature for new messages and a condensed version for ongoing threads.
The branding should be consistent -- same colors, font, logo, and layout -- but the personal details (name, title, phone, photo) will differ. Consistent team signatures build credibility and make even a small company look professional. Tools like BrandFooter let you set brand-level styles and deploy unique signatures for each team member.
Update it whenever your contact information, title, or branding changes. If you use a CTA banner, refresh it monthly or quarterly. Stale signatures with outdated phone numbers or broken images damage your credibility. Set a calendar reminder to review your signature once per quarter at minimum.
Yes, but keep it short and use a small font size (10px). Long disclaimers are rarely read and can make your signature look cluttered. If your organization requires a confidentiality notice, place it at the very bottom of the signature, separated by a horizontal rule or extra spacing. Some industries (legal, healthcare, finance) require disclaimers by regulation.
Create a professional email signature that follows every best practice in this guide. Free for individuals, no account required. For teams, BrandFooter enforces brand consistency automatically.