How to Optimize Images for Email?
Optimize images for newsletters and email marketing. Avoid spam filters and display issues.
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Email images have unique constraints: variable client support, spam filter sensitivity, and size limitations.
A poorly optimized image can break your layout, trigger spam filters, or simply not display.
Learn best practices for email image optimization.
Table of contents
Email Client Constraints
Outlook blocks images by default.
Gmail may change its limits, dimensions or retention periods; check the service’s current rules before sending or publishing.
Heavy images slow loading.
Some formats (WebP, AVIF) aren't supported.
Recommended Formats
JPG: best for photos.
PNG: logos and graphics.
GIF: simple animations.
Avoid: WebP, AVIF, SVG (limited support).
Size Guidelines
Maximum width: 600-700px.
Per image: under 100 KB ideally.
Total images: under 1 MB.
Consider retina with srcset if supported.
Avoiding Spam
Balance text and images (not image-only).
100% image emails trigger spam filters.
Use relevant alt text.
Host on trusted domain.
Alt Text is Critical
Many users block images.
Alt text shows when images don't.
Describe content or call-to-action.
Also improves accessibility.
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How to do it in 3 steps
Resize to max 600-700px width.
Optimize to under 100 KB per image.
Use JPG or PNG format only.
Add descriptive alt text.
Pro tips
- Keep an original version.
- Test several quality settings.
- Use WebP when possible.
- Choose a descriptive file name.
Common mistakes to avoid
- ✗Images too heavy (slow loading).
- ✗Email with only images (spam).
- ✗Missing alt text.
- ✗Using unsupported formats.
Frequently asked questions
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