Does Mailchimp include a built-in CSS inliner?

Mailchimp provides basic functionality but lacks granular control. Mailchimp's template builder inlines styles automatically, but custom HTML imports do not. Inline before importing.

Is there a free way to CSS inlining for Mailchimp campaigns?

Yes. The MiN8T CSS Inliner below runs entirely in your browser — no signup, no upload, and the output works with any Mailchimp workflow.

What image size limit does Mailchimp enforce?

Mailchimp accepts uploads up to 1000 KB per image and recommends a max width of 600px for email body width. Supported formats: JPG, PNG, GIF.

Works with Mailchimp

CSS Inliner for Mailchimp: Free Browser-Based Tool

→ Open the free CSS Inliner

Browser-only, no signup, no upload. Output works with any Mailchimp campaign.

Built by the MiN8T Engineering Team · Updated 28 May 2026

Mailchimp's built-in tools cover the basics, but the CSS inliner workflow often benefits from a dedicated, browser-only preprocessor before uploading. Outlook desktop (Word rendering engine) ignores