Email Newsletter

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Email image sizes 2026

600 px is the safe standard width for all email clients. Keep images under 200 KB for fast loading and deliverability.

Hero / header banner (recommended)

Top-of-email banner. Safe in Gmail, Outlook, Apple Mail. Under 200 KB.

600 × 200 px

3:1

Newsletter body image

Standard full-width inline image. Scales to 100% on mobile.

600 × 400 px

3:2

Square content image

Product photos, social-style cards, profile images.

600 × 600 px

1:1

Retina / Hi-DPI banner

2× width for Retina screens. Set display width to 600px in your email HTML.

1200 × 628 px

1.91:1

Thumbnail / two-column inline

Half-width column. Keep under 80 KB - images compound in long newsletters.

300 × 200 px

3:2

Use JPEG for email images. WebP and AVIF are not reliably supported across email clients in 2026 — Outlook desktop (which uses the Word rendering engine) does not support WebP. JPEG offers the widest compatibility. Use PNG only when you need transparency.

Frequently asked questions

What is the best image size for email newsletters in 2026?

The industry-standard email image width is 600 pixels, which is safe across all major email clients including Gmail, Outlook, Apple Mail, and Yahoo Mail. For a hero banner, 600×200 pixels at a 3:1 ratio works well. For body content images, 600×400 pixels is a solid choice. Keep individual images under 200 KB to avoid triggering spam filters and to ensure fast loading.

Should I use 600px or 1200px wide images in emails?

For standard email clients, 600px wide images are the safe standard. If you want sharp images on Retina / HiDPI screens (iPhones, iPads, modern Macs), upload a 1200px wide image but constrain its display width to 600px in your email HTML using a width attribute or inline CSS. This 2× technique keeps images crisp without breaking layouts.

What image formats work best for email?

JPEG is the safest format for email images - it has the widest support across all email clients. PNG is safe for images that require transparency or sharp text. Avoid WebP and AVIF for email: WebP is unsupported in older Outlook desktop versions and AVIF has virtually no support in email clients as of 2026. GIF is widely supported for simple animations.

How large should email images be in KB?

Keep hero and header images under 200 KB. Inline body images should ideally stay under 80 KB each, as they compound quickly in long newsletters. Gmail clips the entire email message at 102 KB of HTML code, so lean images are critical. Total email weight including all images should stay under 1–2 MB to avoid delivery issues.