Does Klaviyo include a built-in CSS inliner?

Klaviyo provides basic functionality but lacks granular control. Klaviyo inlines CSS at send-time for drag-drop templates; custom HTML campaigns require manual inlining.

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

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

What image size limit does Klaviyo enforce?

Klaviyo accepts uploads up to 2000 KB per image and recommends a max width of 600px for email body width. Supported formats: JPG, PNG, GIF, WebP.

Works with Klaviyo

CSS Inliner for Klaviyo: Free Browser-Based Tool

→ Open the free CSS Inliner

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

Built by the MiN8T Engineering Team · Updated 28 May 2026

Klaviyo'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