BuilderJS Editor

BuilderJS is Interspire Email Marketer’s modern, self-hosted drag-and-drop email editor. It lets you assemble responsive, inbox-ready emails visually by dragging content blocks onto the canvas, without writing HTML. Unlike Unlayer, which is loaded remotely, BuilderJS runs entirely on your own server, so your content never leaves your installation.

In version 8.7.5, BuilderJS was upgraded to its latest major version for a more reliable and responsive editing surface. See BuilderJS Improvements for a summary of what changed. v8.7.5

When to Use BuilderJS

BuilderJS is available when creating newsletters, email templates, and autoresponders. It is recommended for users who want a modern visual builder that is fully self-hosted. For a comparison of all available editors, see Creating and Editing Emails.

⚠️ Editor selection is permanent per item. Once a newsletter, template, or autoresponder is created with BuilderJS, you cannot switch it to another editor. Choose your editor before you start building.

Tip

When you create a new campaign or open a template, Interspire opens the editor you’ve set as your default in your user account. See Advanced User Settings for more information.

Building an Email

BuilderJS presents a visual canvas alongside a palette of content blocks. To build your email:

• Drag a block from the palette onto the canvas to add content such as text, images, buttons, dividers, and spacers.
• Select a block on the canvas to reveal its settings, where you can adjust styling, spacing, alignment, and inline CSS.
• Reorder blocks by dragging them into a new position.
• Structure your layout using column and row blocks to create multi-column, responsive designs that adapt to mobile devices.

Styling is applied as inline CSS, which is the most reliable way to keep formatting intact across the wide range of email clients your recipients use.

RSS Widget v8.7.5

The RSS widget lets you embed dynamic feed content directly into your email. Drag the RSS widget onto the canvas and configure display options such as the number of items to show and whether to display thumbnails. When the email is sent, the widget automatically reflects your latest feed entries, making it ideal for recurring digests and blog roundups.

Starter Templates

BuilderJS includes 18 drag-and-drop starter templates covering common use cases such as welcome emails, product promotions, event invitations, and thank-you messages. Starting from one of these gives you a professionally structured layout that you can customize block by block. See Templates for more information on the bundled template library.

Previewing Your Email v8.7.5

Email previews render inside an isolated frame, so the editor’s styles no longer conflict with the surrounding admin interface. The preview appears much closer to how your recipients will actually see the email — what you see is what your subscribers get.

You can also validate your email to check how it displays in a variety of popular email clients. See Validating an Email for more information.

Preheader Text

BuilderJS supports preheader text — the preview snippet that appears after the subject line in recipients’ inboxes. The preheader field is available in the content editing step for newsletters, autoresponders, and email templates. See Email Preheader Text for guidance and best practices.

Plain-Text Version

As with every editor, your BuilderJS email can include a separate plain-text version for improved deliverability and as a fallback when HTML cannot be rendered. See Text Editor for information on the plain-text editor.