> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mailofly.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Composer

# Visual Campaign Composer

The Mailofly Campaign Composer provides a distraction-free editing experience with live side-by-side rendering previews.

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## Editor Features

* **Rich Text Formatting**: Headings (H1-H3), bold, italic, strikethrough, blockquotes, code blocks, and bulleted/ordered lists.
* **Call to Action (CTA) Buttons**: Insert bulletproof, table-based responsive action buttons with custom colors and radius.
* **Inline Images**: Drag-and-drop or paste images directly into the canvas.
* **Merge Tag Picker**: Click `{ }` in the toolbar to insert dynamic contact attributes (`{{first_name}}`, `{{email}}`, etc.).
* **Raw HTML Mode**: Switch to HTML code view to paste pre-designed MJML or React Email templates.

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## Responsive Device Previews

Use the preview toggles in the top bar to test how your layout renders:

* **Desktop View**: Wide container (600px standard email width).
* **Mobile View**: Narrow viewport (375px mobile breakpoint).
* **Dark Mode**: Simulates Apple Mail / Gmail dark mode inverted colors.


## Related topics

- [Introduction](/broadcasts/introduction.md)
- [Manage Broadcasts](/broadcasts/manage-broadcasts.md)
- [Broadcast editor](/broadcasts/broadcast-editor.md)
- [SDKs](/sdks/index.md)
- [What sending feature to use?](/guides/sending/what-sending-feature-to-use.md)