Freedom251 › Email Template Software
Mosaico
What Mosaico is
Mosaico is an open-source email template builder for designing responsive email templates. Its editor lets users adjust the overall theme and individual element styles, upload images by dragging and dropping, and use global undo and redo. Images are resized to fit available space, and the project describes its templates as working with major email clients and devices. Users can export HTML.
Custom templates can adapt an HTML design for editing in Mosaico; the template language defines which content and styles are editable. The GPL-licensed project is available on the web or as self-hosted software, and its codebase is linked on GitHub. Documentation describes building and running it locally and deploying it through web servers such as Apache PHP or Django. Mailtrain supports editing email with Mosaico, and CiviCRM is among the open-source projects that use it. The free plan costs nothing. Images hosted on mosaico.io cannot be hotlinked, so users need to download and host them themselves.
Who it suits
Mosaico suits people creating responsive email templates who want to customize themes and editable elements. Its self-hosting and custom-template options may also suit developers and template authors.
What it does well
- GPL-licensed and open source.
- Exports templates as HTML.
- Drag-and-drop uploads resize images automatically.
- Global undo and redo are available.
- Supports custom templates through a template language.
What to know first
- Images hosted on mosaico.io cannot be hotlinked.
- Users must download and host images themselves.
Limits
The free Mosaico plan costs nothing. Images hosted on mosaico.io cannot be hotlinked and need to be downloaded and hosted by the user.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Mosaico | Open source email template builder · GPL license | Free |
As mosaico.email lists them, read 4 Oct 2026. The maker's own page has the final word.
Getting started
- Open the Mosaico website to use the web version.
- For self-hosting, follow the project documentation to build and run Mosaico locally.
- Deploy it through a web server such as Apache PHP or Django.
- Choose a template or adapt an HTML design with the template language.
- Customize the theme, element styles, and editable content, then export HTML.
- Download and host images yourself rather than hotlinking images from mosaico.io.
Verdict
Mosaico offers a free, editable route to building responsive email templates, with HTML export and self-hosting options. Users should account for its image-hosting restriction when preparing templates.
Questions
Is Mosaico free?
Yes. Its Mosaico plan is listed as free.
Is Mosaico open source?
Yes. It is distributed under the GPL license, and its codebase is linked on GitHub.
Can I host Mosaico myself?
Yes. It is available as self-hosted software, and the project documentation describes local builds and web server deployment.
Can Mosaico export HTML?
Yes, HTML is listed as an export option.
Which integrations use Mosaico?
Mailtrain supports email editing through Mosaico, and CiviCRM is among the open source projects that use it.
Who makes Mosaico?
The project says it is brought to users by Italian email marketing firm VOXmail.it.
Facts from Mosaico's own pages
- Audience
- The site invites developers, template authors, end users, and UI/UX designers to provide feedback and suggestions. · mosaico.email, 4 Oct 2026
- Customization
- Users can personalize the overall theme and customize individual element styles. · mosaico.email, 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, 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, 4 Oct 2026
- Editing controls
- Mosaico provides a global undo and redo system. · mosaico.email, 4 Oct 2026
- Image handling
- The editor supports drag and drop image uploads and automatically resizes images to fit available space. · mosaico.email, 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, 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, 4 Oct 2026
- Maker
- The site says Mosaico is brought to users by Italian email marketing firm VOXmail.it. · mosaico.email, 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, 4 Oct 2026
- Purpose
- Mosaico is an open source email template builder for designing responsive email templates. · mosaico.email, 4 Oct 2026
- Responsive templates
- The site says its responsive, tested templates work with all major email clients and devices. · mosaico.email, 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, 4 Oct 2026
- Template driven editing
- The project README says templates define which content and styles can be edited in Mosaico. · github.com, 4 Oct 2026
Where Mosaico stands on Freedom251
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