Question 1

How do I compile MJML to HTML?

Accepted Answer

Paste your MJML markup into the RenderOps MJML Compiler and click compile. It outputs production-ready, table-based HTML that renders correctly in all major email clients including all Outlook versions. The compiler runs in your browser — no Node.js installation required.

Question 2

Is MJML free to use?

Accepted Answer

Yes — MJML is an open-source framework. The core library is free to use and the RenderOps MJML Compiler is also completely free, requiring no account or payment.

Question 3

Does MJML work with Mailchimp and Klaviyo?

Accepted Answer

Yes — MJML compiles to standard HTML that you can paste into any ESP HTML editor, including Mailchimp, Klaviyo, HubSpot, ActiveCampaign, and Campaign Monitor. You write MJML, compile it, then upload the resulting HTML to your ESP.

Question 4

What is the difference between MJML and plain HTML tables for email?

Accepted Answer

MJML abstracts away the complexity of nested HTML tables. A simple two-column layout in MJML is 5 lines of code vs 50+ lines of table HTML. MJML compiles to bulletproof table HTML that handles responsive breakpoints, Outlook VML, and cross-client quirks automatically.

MJML to HTML Converter Online