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 limits HTML size to 102 KB.

    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

    1

    Resize to max 600-700px width.

    2

    Optimize to under 100 KB per image.

    3

    Use JPG or PNG format only.

    4

    Add descriptive alt text.

    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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