Freedom251 › Email Design Software
Mosaico
What Mosaico is
Mosaico is a JavaScript library for editing email templates, with available editing controls determined by each template. Its drag-and-drop editor accepts image uploads and automatically resizes them to fit available space. Depending on the template, users can adjust blocks, content, image placement and size, visibility, URLs, colors, fonts, text size, and buttons. The editor includes a global undo and redo system. Mosaico describes its templates as responsive and tested to work with major email clients and devices. Developers can adapt HTML email templates for use with its template language. The project can be used on the web or self-hosted; its README describes running it locally and includes Dockerfiles for Alpine Linux and CentOS 7. Mosaico is free under the GPL-3.0 license. The README identifies Mailtrain, GoodEnough’s Mosaico app, and CiviCRM as projects that include or use it. The project directs free support requests to GitHub issues and lists commercial support by email. The website says images hosted on mosaico.io cannot be hotlinked and asks users to download and host images themselves.
Who it suits
Mosaico suits developers and teams that need a free, self-hostable email-template editor and can work with template-defined controls. It may also suit projects seeking an editor distributed under GPL-3.0.
What it does well
- Free under the GPL-3.0 license.
- Supports drag-and-drop image upload and automatic resizing.
- Includes global undo and redo.
- Can be used on the web or self-hosted.
What to know first
- Editing options depend on the selected template.
- Images hosted on mosaico.io cannot be hotlinked.
- Free support requests go to GitHub issues.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Mosaico open-source editor | GPL-3.0 license · commercial support available | Free |
As mosaico.io lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
Mosaico provides a free editor for template-based email design, with self-hosting and template adaptation options. Users need to host images themselves rather than hotlinking them from mosaico.io.
Facts from Mosaico's own pages
- Custom templates
- Developers can adapt HTML email templates for Mosaico using its template language. · mosaico.io, 11 Oct 2026
- Drag-and-drop editing
- The editor supports drag-and-drop image upload and automatically resizes images to fit available space. · mosaico.io, 11 Oct 2026
- Founded
- 2015 · mosaico.io, 28 Sept 2026
- Headquarters
- Italy · mosaico.io, 28 Sept 2026
- Image editor integration
- The live demo uses a custom MoxieManager integration for image editing. · github.com, 11 Oct 2026
- Image hosting limitation
- The website says that, since April 11, 2025, hotlinking images from mosaico.io is disallowed due to phishing abuse and asks users to download and host images themselves. · mosaico.io, 11 Oct 2026
- Integration options
- The project README identifies Mailtrain, GoodEnough’s Mosaico app, and CiviCRM as projects that include or use Mosaico. · github.com, 11 Oct 2026
- License
- The Mosaico code is distributed under the GPL-3.0 license. · github.com, 11 Oct 2026
- Maker
- The site says Mosaico is brought to users by Italian email marketing firm VOXmail.it. · mosaico.io, 11 Oct 2026
- Purpose
- Mosaico is a JavaScript library for editing email templates, with editing options defined by each template. · github.com, 11 Oct 2026
- Responsive emails
- Mosaico describes its templates as responsive and tested to work with major email clients and devices. · mosaico.io, 11 Oct 2026
- Self-hosting
- The README describes building and running Mosaico locally and includes Dockerfiles for Alpine Linux and CentOS 7. · github.com, 11 Oct 2026
- Support
- The project directs free-support requests to GitHub issues and lists commercial support by email. · github.com, 11 Oct 2026
- Template customization
- Users can customize template-provided blocks, content, image placement, sizes, visibility, URLs, colors, fonts, text size, and buttons, depending on the template. · mosaico.io, 11 Oct 2026
- Undo and redo
- The site lists a global undo and redo system among its features. · mosaico.io, 11 Oct 2026
Where Mosaico stands on Freedom251
- Email Design Software#18 of 63