Compress Images for Mailchimp — Free & Instant

Mailchimp email campaigns require properly sized, email-safe images. Optimized images improve email deliverability, load faster in all email clients, and increase engagement rates. Use ImageSmith's free image optimizer to compress your Mailchimp images directly in your browser — no account needed, no watermarks, and no ads. Target under 10,240KB per image for best results on Mailchimp.

Max File Size

10,240 KB

Recommended Format

JPEG

Dimensions

600px wide for email body, 1200×600 for header banners

Mailchimp Compression Tips

  • 1.Email content area is 600px wide — design at 600px or 1200px (2× Retina)
  • 2.Keep individual images under 200KB for fast email loading
  • 3.Avoid WebP — Outlook does not support it in emails
  • 4.Test emails across clients (Gmail, Outlook, Apple Mail) before sending

Compress by Format

Other Platform Optimizers

Mailchimp Image Optimization FAQ