Where is the 600×400 format used?
The large header opens an email with a full-bleed image, typically a product or lifestyle shot. It suits sends whose impact rests on the visual, less so regular information newsletters.
How much copy fits into 600×400?
| Headline (recommended) | 55 characters |
| Subline useful | ✓ |
| Product image useful | ✓ |
| Target file size | ≤ 90 KB (JPG) |
Room for artwork, headline and subline. Keep the lower edge clear for the HTML button beneath.
Related sizes
Design tips for 600×400
- ✓Always 600 px wide (1200 px for retina) — wider images are not scaled in Outlook.
- ✓Important copy belongs in the HTML text, not in the image: many clients block images at first.
- ✓Keep files small, ideally under 100 KB — email clients load all images at once.
More Newsletter formats
| FORMAT | SIZE | USE |
|---|---|---|
| Newsletter Header | 600×200 | |
| Newsletter Hero | 600×300 | |
| Newsletter 16:9 | 640×360 | |
| Retina Header | 1200×400 | |
| Newsletter Module | 300×300 | |
| Newsletter Footer | 600×150 |
Frequently asked questions
- Does a 400 pixel header push the content away?
- On a phone it does. Together with the logo row and the preheader it nearly fills the first screen, so put the decisive message inside the image itself and the recipient gets it without scrolling.
- How do I keep the file size under control?
- Export as JPG at moderate quality and check the result on a handset. Around 90 KB is realistic for an image-led 600x400; much heavier headers noticeably delay rendering, especially over mobile data.
- Which file format and file size?
- myfeedr delivers 600×400 as PNG (lossless) and JPG. For trafficking, the JPG is what counts: around 90 KB is a realistic target for this size – small enough for any network without visible quality loss.
- What does the format cost?
- Formats are not sold individually — :size is part of the "Complete" package from 349 €. Analysing your website is free.
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