Resend Open-Sources Its Email Editor So Developers Can Build Their Own

Resend has open-sourced its visual email editor as part of React Email 6.0. The editor, which the company already uses inside its own product, is now free for any developer to use and build on.

The new package, called @react-email/editor, lets developers drop a full visual email builder directly into their own apps. Users can write and format emails without touching any code, and the editor exports clean, inbox-ready HTML automatically. That means no more manually writing table-based layouts or fighting with email client quirks.

React Email has grown into a widely used open-source project, with two million weekly downloads from npm and nearly 200 contributors. The editor is now its biggest addition yet.

The tool is built on TipTap and ProseMirror, two well-known text editing frameworks. It comes with standard formatting tools like headings, bold text, lists, and links, as well as a floating toolbar, slash commands for adding content blocks, and a sidebar for adjusting styles like padding, colors, and borders.

Developers can also build their own custom blocks using a simple API. For example, a team could add an image uploader that connects to their own storage, or a block that embeds a chart or social post. The editor handles both the visual output and the underlying email-safe HTML for each custom block.

Styling is straightforward too. Developers can apply a default theme with a single import or pass in a custom theme to match their product's look.

The release also includes a new set of ready-made email templates for common use cases like sign-up flows and online store emails, created in partnership with Character Studio.

Getting started takes just one install command and a single React component. Full documentation and live examples are available at React Email.