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Mosaico
What it is
Mosaico is a free, open source email template builder for creating responsive HTML email designs. It runs on the web or as self-hosted software and is distributed under the GPL license, with its codebase linked on GitHub. The editor lets you set an overall theme, adjust individual element styles, and upload images by dragging them into the design. Images are resized to fit available space, and global undo and redo controls support revisions. A template language can turn an HTML design into an editable Mosaico template, while template definitions specify which content and styles users may change. The site says its responsive templates work with major email clients and devices, and HTML export is available. Documentation covers local builds and deployment through Apache PHP or Django. Mailtrain supports Mosaico editing, and CiviCRM is listed as a user. Images from mosaico.io must be downloaded and hosted elsewhere.
For and against
For
- Free, open source GPL software
- Web and self-hosted deployment
- Drag-and-drop image uploads
- HTML export available
- Global undo and redo
Against
- Images cannot be hotlinked from mosaico.io
- Support requests go through linked guidance
- Self-hosting requires deployment setup
The verdict
Mosaico provides a free, GPL-licensed editor with responsive templates, customization, image handling, and HTML export. Its self-hosting options and template language suit technical users, while image-hosting restrictions and deployment work are important considerations.
Who it suits
Mosaico suits developers, template authors, end users, and UI/UX designers building responsive email templates. It also fits teams that want self-hosting or GPL-licensed source.
Plans and prices
Mosaico
Open source email template builder · GPL license
Read 4 Oct 2026 · mosaico.email
On the record
- Audience
- The site invites developers, template authors, end users, and UI/UX designers to provide feedback and suggestions.mosaico.email · read 4 Oct 2026
- Customization
- Users can personalize the overall theme and customize individual element styles.mosaico.email · read 4 Oct 2026
- Custom templates
- Mosaico supports custom templates through a template language that can make an HTML design work with the editor.mosaico.email · read 4 Oct 2026
- Deployment
- The project README documents building and running Mosaico locally and deploying it through a web server such as Apache PHP or Django.github.com · read 4 Oct 2026
- Editing controls
- Mosaico provides a global undo and redo system.mosaico.email · read 4 Oct 2026
- Image handling
- The editor supports drag and drop image uploads and automatically resizes images to fit available space.mosaico.email · read 4 Oct 2026
- Image hosting limit
- The site says hotlinking images from mosaico.io is disallowed and asks users to download and host images themselves.mosaico.email · read 4 Oct 2026
- Integrations
- The project README says Mailtrain supports email editing via Mosaico and lists CiviCRM among open source projects using it.github.com · read 4 Oct 2026
- Maker
- The site says Mosaico is brought to users by Italian email marketing firm VOXmail.it.mosaico.email · read 4 Oct 2026
- Open source license
- The official site says Mosaico is distributed under the GPL license and links to its complete codebase on GitHub.mosaico.email · read 4 Oct 2026
- Purpose
- Mosaico is an open source email template builder for designing responsive email templates.mosaico.email · read 4 Oct 2026
- Responsive templates
- The site says its responsive, tested templates work with all major email clients and devices.mosaico.email · read 4 Oct 2026
- Support
- The site directs users who need support to its linked support guidance and says feedback email is not for support requests.mosaico.email · read 4 Oct 2026
- Template driven editing
- The project README says templates define which content and styles can be edited in Mosaico.github.com · read 4 Oct 2026
