Does Campaign Monitor include a built-in CSS inliner?

Campaign Monitor provides basic functionality but lacks granular control. Campaign Monitor's templates inline CSS automatically. Custom HTML imports require manual inlining for Outlook compatibility.

Is there a free way to CSS inlining for Campaign Monitor campaigns?

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

What image size limit does Campaign Monitor enforce?

Campaign Monitor 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 Campaign Monitor

CSS Inliner for Campaign Monitor: Free Browser-Based Tool

→ Open the free CSS Inliner

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

Built by the MiN8T Engineering Team · Updated 28 May 2026

Campaign Monitor'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