Use a 600 to 640 pixel email body as your default width, regardless of whether you build in Mailchimp or beehiiv. Mailchimp gives you more visual control over spacing, columns, image blocks, and template structure. beehiiv is cleaner and faster for editorial newsletters, but it offers fewer layout controls. If your goal is stable rendering across Gmail, Apple Mail, Outlook, and mobile inboxes, treat dimensions as a system, not a design afterthought.
TLDR: For most newsletters, set the main content width at 600 px, use images at 1200 px wide for crisp retina display, and keep file sizes under 200 KB where possible. Mailchimp is better when you need custom layouts, product sections, and brand-heavy formatting. beehiiv is better for text-led newsletters where speed, readability, and publishing flow matter more. For example, a publisher moving from a 720 px layout to a 600 px layout may see fewer mobile display issues and a 5% to 12% lift in click consistency, depending on audience device mix.
Recommended newsletter dimensions
The safest newsletter width remains 600 px. Some modern templates can stretch to 640 px, but 600 px still performs well across older clients and cramped preview panes. Wider layouts may look polished on desktop. Then they break on phones, clip in Outlook, or force awkward scaling.
- Email body width: 600 px standard, 640 px maximum for most cases
- Hero image width: 1200 px exported for a 600 px display area
- Inline image width: 600 px or less, depending on content block
- Logo width: 120 to 240 px displayed size
- Minimum body font: 15 to 16 px
- Button height: 44 to 52 px for thumb-friendly taps
- Side padding: 20 to 32 px on desktop, 16 to 20 px on mobile
These numbers are not decorative. They protect readability. They also reduce rendering surprises in inboxes that still handle HTML email badly.
Mailchimp dimensions: more control, more decisions
Mailchimp works well when the newsletter needs a designed layout. It supports drag-and-drop sections, image groups, product blocks, columns, buttons, dividers, and custom templates. That flexibility is useful for ecommerce, event marketing, seasonal campaigns, and brand campaigns.
The standard Mailchimp template width is commonly built around 600 px. Many templates keep content centered inside that frame. You can add full-width background sections, but the readable content should still sit inside a controlled container. That is where many teams go wrong. They stretch banners too wide, then wonder why text looks tiny on mobile.
Mailchimp is strongest for:
- Visual newsletters with multiple content blocks
- Retail promotions and product cards
- Campaigns that need brand-specific spacing and colors
- Teams with designers or email specialists
- A/B testing layouts, headers, buttons, and calls to action
The catch is that Mailchimp can make small layout edits feel slower than they should. Moving a block, checking mobile preview, adjusting padding, then testing again may add several minutes to a campaign build. For a weekly marketing email, that is acceptable. For a daily creator newsletter, it can feel heavy.
beehiiv dimensions: cleaner, faster, less flexible
beehiiv is built for publishing. Its layout approach suits writers, analysts, media brands, and newsletter-first businesses. The editor keeps the focus on content. You write, format, add images, insert links, and send.
beehiiv newsletters tend to use a clean content column. This is good for readability. A simple column around 600 px wide works well on desktop and collapses neatly on mobile. Because beehiiv avoids complex layout options, there are fewer chances to ruin spacing by accident.
beehiiv is strongest for:
- Editorial newsletters
- Founder updates and investor notes
- Creator-led publications
- Text-heavy content with occasional images
- Fast publishing schedules
Honestly, it feels like beehiiv saves you from yourself. You get fewer knobs to turn. That can be annoying when you want a very specific layout, but useful when consistency matters more than decoration.
Mailchimp vs beehiiv: dimension control comparison
| Area | Mailchimp | beehiiv |
|---|---|---|
| Recommended width | 600 px, with broader layout options | 600 px content-first column |
| Image control | Strong resizing and block settings | Simple and efficient |
| Column layouts | Better for multi-column sections | Limited, cleaner by design |
| Mobile preview | Useful for layout checks | Good for simple content checks |
| Best fit | Marketing and ecommerce | Publishing and media |
Image dimensions that work in both platforms
Images cause many newsletter problems. A banner may look sharp in the editor, then appear blurry on a phone. The fix is simple. Export images at twice the displayed size.
If your email content area is 600 px wide, export a full-width hero image at 1200 px wide. Then let the platform display it at 600 px. This supports retina screens without forcing a huge visual file into the inbox.
- Hero image: 1200 × 600 px for a 2:1 banner
- Square feature image: 1200 × 1200 px, displayed at 600 × 600 px
- Article thumbnail: 400 to 600 px wide
- Logo: 300 to 600 px wide source file, displayed smaller
- GIFs: Use with care, preferably under 1 MB
Do not upload huge images straight from design software or a camera. A 3 MB image can slow load time and hurt engagement. Compress it first. For most email images, 100 KB to 200 KB is a practical target.
Mobile sizing matters more than desktop polish
Most newsletter lists now include a heavy mobile audience. For many publishers, mobile opens sit between 45% and 70%. That means your desktop design is not the main event.
Use short paragraphs. Keep buttons wide enough to tap. Avoid three-column layouts unless you test them carefully. On phones, columns may stack in odd ways. Mailchimp gives you more tools to manage that behavior. beehiiv avoids much of the issue by using simpler layouts.
A serious rule: never judge a newsletter only from the editor. Send test emails to Gmail, Apple Mail, and Outlook. Check both light mode and dark mode. Expect a few spacing quirks. Email HTML is still messy.
Best settings for Mailchimp
- Keep the main container at 600 px.
- Use single-column layouts for key messages.
- Limit two-column sections to short content blocks.
- Set body copy at 16 px or larger.
- Use buttons with at least 44 px height.
- Preview every campaign on mobile before sending.
Mailchimp is the safer pick if your newsletter is part of a broader sales campaign. It handles richer design needs better. Just keep the layout disciplined.
Best settings for beehiiv
- Use a clean content column near 600 px.
- Keep images full-width or clearly centered.
- Avoid overloading the issue with large graphics.
- Use clear section headings for scanning.
- Keep sponsor blocks visually distinct but not oversized.
- Test long issues on mobile before publishing.
beehiiv is the better choice when the newsletter is the product. It favors reading, publishing speed, and list growth. It is less suited to complex merchandising layouts.
Which platform should you choose?
Choose Mailchimp if your newsletter needs polished campaign design, product grids, brand sections, and frequent layout testing. Choose beehiiv if your main goal is publishing a readable newsletter with clean formatting and less production drag.
The dimension strategy does not change much between them. A 600 px content width, retina-ready images, compressed files, mobile-safe buttons, and readable type will serve both platforms well. The real difference is control. Mailchimp gives you more of it. beehiiv removes much of it so you can publish faster.
For serious newsletter performance, resist the urge to design for the largest screen in the room. Design for the inbox your reader actually uses. Most of the time, that means a narrow column, sharp images, clear hierarchy, and no clutter.
