What is the ideal email signature size?

For a standard professional signature, aim for 400-500px wide and 100-150px tall. This gives you room for a photo or logo, contact details, and a few social icons without dominating the email. Keep total image file size under 100KB. The signature should complement your email, not compete with it for attention.

What size should my signature photo be?

Profile photos should be 80-120px square (1:1 aspect ratio). For retina/high-DPI displays, provide a 160-240px image and display it at 80-120px using the HTML width attribute. Keep the file under 50KB. Use JPEG for photos and crop tightly to your face — a tiny photo of your whole body is unrecognizable.

What size should my company logo be in my signature?

Company logos should be 150-250px wide and 40-80px tall. Use a PNG with a transparent background so it works on any email client background color (including dark mode). Keep the file under 30KB. If your logo is square or vertical, it may need to be smaller to fit well in a horizontal signature layout.

How many images should be in an email signature?

Ideally 1-3 images: a photo or logo, and optionally a few social icons (which can be a single sprite image). More than 5 images means more HTTP requests, larger email size, and more chances for broken images. Some clients block images by default, so design your signature to still make sense when images don't load.

Should I use an image-based or HTML/text signature?

Use HTML/text for the core content (name, title, contact info) and images only for visual elements (photo, logo, social icons). Never make your entire signature a single image — it won't display when images are blocked, it can't be searched or copied, and screen readers can't read it. A hybrid approach gives you the best of both worlds.

Why does my signature look different in Outlook?

Outlook for desktop uses Microsoft Word's rendering engine, which doesn't support many modern CSS properties. Common issues: flexbox and grid don't work (use tables instead), some padding/margin calculations differ, and background images may not display. Always test your signature in Outlook specifically. Use table-based layouts and inline styles for the most consistent rendering.

How do I make my signature work on mobile?

Keep the signature narrow enough to work at 320px width (mobile viewport). Use percentage-based widths where possible. Stack elements vertically on narrow screens if needed. Reduce image count since mobile connections can be slower. Test by sending yourself an email and checking on your phone. A good mobile signature is the same signature as desktop, just designed to flex gracefully.

Should I add a promotional banner to my email signature?

It depends on your role. For sales and marketing, a rotating promotional banner (400-600px wide, 80-120px tall) can be effective — it's like a free ad in every email. For technical or executive roles, it can feel unprofessional. If you add one, keep it subtle, update it regularly, and make sure it links to something valuable. An outdated promotion from 6 months ago looks worse than no banner at all.

Back to Tools

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

80-120px × 80-120pxMax 50KBJPEG or PNG

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

150-250px × 40-80pxMax 30KBPNG (transparent background)

Horizontal logos work best. Keep background transparent so it works on any email client background. Avoid logos taller than 80px.

Social Media Icons

20-24px × 20-24pxMax 5KB eachPNG

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

400-600px × 80-120pxMax 80KBJPEG or PNG

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

80-150px × 30-60pxMax 20KBPNG

Awards, certifications, or CTA badges. Keep small and unobtrusive. One badge is fine — a wall of badges looks cluttered.

QR Code

80-100px × 80-100pxMax 15KBPNG

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.

W: 400-500pxH: 100-150px

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.

Total Width (px)

Total Height (px)

Number of Images

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

400 × 120pxStandard (photo + contact + 2-3 social)

Your signature IS your brand. Include a professional photo, your title, and links to your portfolio or booking page.

Sales / Business Development

500 × 150pxStandard or Detailed

Include a direct calendar link or phone number prominently. Every email is a chance to book a meeting.

Corporate Employee

500 × 150-200pxCorporate template

Follow your company's brand guidelines. Use the standardized template to maintain consistency across the organization.

Developer / Technical

300 × 60pxMinimal

Less is more. Name, title, and maybe a GitHub link. Technical audiences often prefer plain-text signatures.

Marketing Professional

500 × 200pxDetailed with CTA

Add a rotating promotional banner. Change it monthly to highlight current campaigns, blog posts, or events.

Executive / C-Suite

400 × 100pxClean and authoritative

Keep it simple and dignified. Name, title, company. Maybe a LinkedIn link. No promotional banners — your title speaks for itself.

Like this tool? Try Sequenzy for free

AI-powered email marketing with Stripe integration, automations, and built-in analytics.

Start Free Trial

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 word counter 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.

Frequently Asked Questions

More Free Tools

View all tools

Email Banner Size Guide

Complete reference guide for email banner dimensions. Includes recommended sizes for newsletters, promos, and hero images, email client compatibility data, retina optimization, custom size checker, and image format comparison.

Email Header Size Guide

Complete reference for email header dimensions. Covers logo headers, standard banners, hero sections, and preheader bars. Includes a custom size checker, email type recommendations, and Outlook compatibility tips.

Free AI HTML Email Builder

Build responsive HTML emails with AI chat. Generate subject lines, preview text, and production-ready email HTML with desktop/mobile preview, screenshot-based edits, and code you can copy into any email platform.

Shopify Profit Margin Calculator

Calculate real Shopify profit per order after COGS, shipping, fulfillment, payment fees, returns, apps, and ad cost.