Compress Images for Email

Email images are uniquely constrained. Most email clients impose total email size limits (Gmail caps at 25MB, Outlook at 20MB), and many strip or block images that exceed certain thresholds. Even when images do load, many subscribers open emails on mobile data connections where every kilobyte matters. Large images in emails don't just load slowly — they can prevent your email from being delivered at all, landing in spam or being truncated by the email client.

Coda One's Image Compressor helps you hit the sweet spot for email images. The recommended approach: compress hero images to under 200KB and inline images to under 80KB. At 70-80% quality, most photos retain their visual impact while meeting these size targets. For email headers and banners, JPEG output gives the best balance. Avoid PNG for photographs in email — the files are too large for email's constraints.

Email marketers report measurable improvements after optimizing images: faster rendering means higher read rates, and lighter emails have better deliverability scores. The compressor runs in your browser during compression, which fits subscriber-facing content and client campaign prep. Process your email images here before importing them into Mailchimp, ConvertKit, HubSpot, or any other ESP.