Email Header Image Size
Calculate email header image dimensions for 600px templates and 2x retina exports.
Controls
Local image preview
Your image stays in your browser. We do not upload or store your file.
Download overlays are transparent guides only. Uploaded image previews stay in this browser.
Workspace preview
Safe-zone result
Email Header Image: working canvas 1200×400px, 1 overlay zones. Upload an optional local image to preview crop and UI risk.
| Check | Status | Detail |
|---|---|---|
| Minimum width | info | No minimum width listed for this spec. |
| Minimum height | info | No minimum height listed for this spec. |
| Recommended canvas | safe | 1200×400px vs 1200×400px target |
| Aspect ratio | safe | 0% ratio mismatch |
| Megapixels | info | 0.48MP; no MP limit listed. |
| File size | safe | 0MB vs maximum 1MB |
| Format | danger | Allowed: JPEG, PNG, GIF, WebP |
- Many email templates render around 600px CSS width; 1200px provides 2x density.
- Keep file size small for deliverability and load speed.
FAQ
Why use 1200px wide?
It gives 2x pixel density for a 600px-wide email template.
Should email images be huge?
No. Keep file size controlled for faster loading.
Related tools
Sources and limits
strong-secondary: Mailchimp email image design guidance. Last checked 2026-05-24.
Platform dimensions are centralized in data files. Every platform spec must include sourceConfidence, sourceUrl and lastCheckedAt. Official platform documentation overrides this tool when specifications differ.