Does Kit (ConvertKit) include a built-in CSS inliner?

Kit (ConvertKit) provides basic functionality but lacks granular control. Kit's visual editor inlines CSS automatically. Custom HTML emails (advanced plans only) require manual inlining.

Is there a free way to CSS inlining for Kit (ConvertKit) campaigns?

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

What image size limit does Kit (ConvertKit) enforce?

Kit (ConvertKit) 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 Kit (ConvertKit)

CSS Inliner for Kit (ConvertKit): Free Browser-Based Tool

→ Open the free CSS Inliner

Browser-only, no signup, no upload. Output works with any Kit (ConvertKit) campaign.

Built by the MiN8T Engineering Team · Updated 28 May 2026

Kit (ConvertKit)'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