Standard email header images are 600 × 200 px (3:1). This is the safe maximum width across every major email client in 2026.
Email clients render images differently, and mobile clips anything wider than 600 px. Here are the 2026 dimensions that render correctly in Gmail, Apple Mail, Outlook, and every major client.
| Asset | Dimensions | Ratio | Format | Max size |
|---|---|---|---|---|
| Standard Email Header | 600 × 200 | 3:1 | JPG / PNG | 200 KB |
| Retina Email Header (2x) | 1200 × 400 | 3:1 | JPG / PNG | 500 KB |
| Mobile-Optimized Header | 600 × 150 | 4:1 | JPG / PNG | 150 KB |
| Full-Width Hero | 600 × 400 | 3:2 | JPG / PNG | 300 KB |
| Email Logo | 150 × 50 | 3:1 | PNG | 50 KB |
| Email Signature Banner | 600 × 100 | 6:1 | JPG / PNG | 100 KB |
Pro tip: Never make an email header wider than 600 px — Gmail, Apple Mail, and Outlook all clip anything wider on mobile. Ship at 1200 × 400 with an HTML width of 600 for retina sharpness.
Source: Litmus Email Design Guide
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Why Email Header Size Matters
Email clients enforce a maximum width of 600 px for reliable rendering across Gmail, Apple Mail, Outlook, and Yahoo. Wider images get clipped on mobile or scaled down (blurring). Sticking to 600 px width is the single most important rule for consistent email rendering.
Retina in Email
To keep header images sharp on retina displays, export at 1200 × 400 px (2x) and set the HTML width="600" attribute. Every major email client respects this pattern.
Common mistakes to avoid
- Uploading at 800+ px width — mobile clients clip it.
- Skipping the retina version — high-DPI screens blur single-density images.
- Files over 500 KB — Gmail and Outlook slow down or clip the message.
Frequently asked questions
What size should an email header image be in 2026?
Standard email headers are 600 × 200 px (3:1). This is the safe maximum width for every major email client.
Why is my email header cut off?
Mobile email clients clip anything wider than 600 px. Even if the source image is fine, uploading at 1200 × 400 without setting HTML width to 600 causes clipping.
What is the best format for email images — JPG or PNG?
Use JPG for photos (smaller files, faster load) and PNG for logos and graphics with transparency or sharp text.
How large should email images be in KB?
Keep individual images under 200 KB. Total email weight should stay under 1 MB — Gmail clips longer emails and hurts deliverability.
Should I use retina images in email?
Yes, but ship at 2x the display size (1200 × 400 for a 600 × 200 display) and set HTML width to the display size.
What size is a logo in an email header?
150 × 50 px PNG is standard. Keep it small so it doesn't dominate the header.