Compress HEIC Images for Mailchimp
Mailchimp email campaigns require properly sized, email-safe images. Optimized images improve email deliverability, load faster in all email clients, and increase engagement rates. High Efficiency Image Format — the default photo format on iPhones and modern Apple devices. Excellent compression. Use ImageSmith to compress your HEIC images to the ideal file size for Mailchimp — target under 10,240KB for optimal performance. Processing is fully browser-based — no server uploads.
Recommended format
JPEG
Max file size
10,240KB
Dimensions
600px wide for email body, 1200×600 for header banners
✓Email content area is 600px wide — design at 600px or 1200px (2× Retina)
✓Keep individual images under 200KB for fast email loading
✓Avoid WebP — Outlook does not support it in emails
✓Test emails across clients (Gmail, Outlook, Apple Mail) before sending
Compress HEIC for Other Platforms
Compress HEIC for Mailchimp — FAQ
Mailchimp works best with images under 10,240KB. Recommended dimensions: 600px wide for email body, 1200×600 for header banners. ImageSmith can compress HEIC images to any target size in seconds.
Mailchimp primarily supports JPEG, PNG, GIF. Converting to JPEG is recommended for best compatibility.
Upload your HEIC image to ImageSmith, set a target size under 10,240KB, and compress. Email content area is 600px wide — design at 600px or 1200px (2× Retina)
Mailchimp email templates are typically 600px wide. Use 600px or 1200px (for Retina) wide images. Keep each image under 200KB for fast loading. Stick to JPEG and PNG — avoid WebP.