Email Signature Size Guide
Complete guide to email signature dimensions. Includes recommended sizes for photos, logos, social icons, and banners. Covers signature styles (minimal to corporate), email client compatibility, and a custom size checker.
Signature Element Dimensions
Recommended sizes for each part of your email signature.
Profile Photo / Headshot
Square aspect ratio (1:1). Round cropping is done via CSS — always provide a square image. Keep it professional. Retina: provide 160-240px, display at 80-120px.
Company Logo
Horizontal logos work best. Keep background transparent so it works on any email client background. Avoid logos taller than 80px.
Social Media Icons
Consistent size for all icons. Use simple, flat-color icons that work at small sizes. Don't use more than 4-5 social icons.
Banner / Promotional Image
Optional marketing banner below the signature. Keep it compact. Change it monthly for seasonal promotions. Some email clients may clip it.
CTA Badge / Award Logo
Awards, certifications, or CTA badges. Keep small and unobtrusive. One badge is fine — a wall of badges looks cluttered.
QR Code
For vCard download or contact link. Must be large enough to scan (minimum 80px). Test scanning from a phone before using.
Signature Style Presets
Choose a style to see recommended dimensions and trade-offs.
Standard Signature
Photo or logo + contact info + social icons.
Images needed:
- • Profile photo (80×80px) or company logo (150×50px)
- • Social icons (20×20px each, max 4-5)
Pros
- • Good balance of branding and size
- • Most popular format
- • Works well across all clients
Cons
- • Images may not load by default in some clients
- • Slightly larger email size
Check Your Signature Size
Enter your total signature dimensions and number of images to get compatibility feedback.
Email Client Compatibility
All major email clients support HTML signatures with images. Key rules: keep width under 600px, use inline CSS, and always provide alt text for images. Click "Show Details" for client-specific notes.
Common Mistakes to Avoid
Using a signature that's basically a full email
Keep signatures under 150px tall. Recipients care about your message, not your signature. A massive signature screams 'I care more about my branding than your time.'
Embedding images as base64 instead of hosting them
Base64-encoded images massively bloat email size and are blocked by some clients. Host images on a CDN and reference them with URLs.
Using 10+ social media icons
Pick your 3-4 most important platforms. Nobody clicks all 10. More icons = more visual noise and slower loading.
Not providing alt text for images
When images are blocked (Gmail does this by default), alt text shows instead. Without it, you get broken image icons and no context.
Relying on CSS that email clients don't support
Use inline styles only. No external stylesheets, no flexbox, no grid. Tables are still the reliable layout method for email signatures.
Forgetting about mobile
50%+ of emails are read on mobile. A 600px-wide signature table gets squeezed. Use percentages or make your signature naturally narrow enough to work on 320px screens.
Adding animated GIFs to signatures
They're distracting, increase email size, and Outlook only shows the first frame. Save animations for marketing campaigns, not your signature.
Including a legal disclaimer longer than the signature itself
If legally required, keep it minimal and in small, muted text. A 200-word disclaimer after a 3-line email feels absurd.
Signature Size by Use Case
Freelancer / Solopreneur
Your signature IS your brand. Include a professional photo, your title, and links to your portfolio or booking page.
Sales / Business Development
Include a direct calendar link or phone number prominently. Every email is a chance to book a meeting.
Corporate Employee
Follow your company's brand guidelines. Use the standardized template to maintain consistency across the organization.
Developer / Technical
Less is more. Name, title, and maybe a GitHub link. Technical audiences often prefer plain-text signatures.
Marketing Professional
Add a rotating promotional banner. Change it monthly to highlight current campaigns, blog posts, or events.
Executive / C-Suite
Keep it simple and dignified. Name, title, company. Maybe a LinkedIn link. No promotional banners — your title speaks for itself.
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AI-powered email marketing with Stripe integration, automations, and built-in analytics.
About this tool
Your email signature appears at the bottom of every email you send. For most professionals, that's hundreds or thousands of impressions per year — making it one of the most consistently viewed pieces of your personal or company branding. Getting the dimensions right means it looks professional across Gmail, Outlook, Apple Mail, and mobile devices.
This guide covers every element of an email signature: profile photos, company logos, social icons, promotional banners, and more. You'll find recommended pixel dimensions, maximum file sizes, and format advice for each element, plus a checker to evaluate your own signature dimensions.
Need to actually build a signature? Use our email signature generator to create one in minutes. If you're optimizing your overall email design, check our email banner size guide for campaign headers, and our email size checker to make sure your total email (including signature) stays under clipping limits.
Remember that your signature adds weight to every single email. A signature with 5 unoptimized images can add 500KB+ to every message. Multiply that by thousands of emails and you're adding real load to your recipients' inboxes. Our text-to-image ratio checker can help you find the right balance.
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