Email Image Guide
| Image Type | Width (px) | Max File Size |
|---|---|---|
| Email template width | 600–640 px | — |
| Header / Hero image | 600 px | 200 KB |
| Body image | 580 px | 100 KB |
| Thumbnail | 165 px | 40 KB |
| Logo | 200 px | 20 KB |
| Total email size | — | < 102 KB (Gmail clips above) |
Always set width in HTML: <img width="600" ...> — never rely on CSS alone
Always include alt text: Many email clients block images by default
Use JPG for photos (smaller file), PNG for logos with transparency
Avoid WebP/AVIF: Outlook and some clients don't support modern formats
Host images externally: Never embed base64 images in emails — bloats size