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Mosaico

mosaico.email

Free plan WebSelf-hosted
Visit mosaico.email
Spec score 7.6 #17 of 26 in Email Template Software

What it is

Mosaico is a GPL-licensed, open source email template builder for creating responsive email designs. Its editor lets users change an overall theme, adjust individual element styles, and upload images by dragging them into the editor; images are resized to available space. Global undo and redo support revisions. A template language lets developers adapt HTML designs for editing, while templates define which content and styles users can change. The project describes its responsive templates as working with major email clients and devices and supports HTML export. Mosaico runs on the web or as self-hosted software. Documentation covers local builds and deployment through web servers such as Apache PHP or Django. Mailtrain supports editing through Mosaico, and CiviCRM is listed among projects using it. The complete codebase is linked on GitHub. Mosaico is brought by VOXmail.it. Images from mosaico.io must be downloaded and hosted elsewhere instead of hotlinked.

Spec sheet

Purpose
Mosaico is an open source email template builder for designing responsive email templates.Read 4 Oct 2026 · mosaico.email
Audience
The site invites developers, template authors, end users, and UI/UX designers to provide feedback and suggestions.Read 4 Oct 2026 · mosaico.email
Deployment
The project README documents building and running Mosaico locally and deploying it through a web server such as Apache PHP or Django.Read 4 Oct 2026 · github.com
Integrations
The project README says Mailtrain supports email editing via Mosaico and lists CiviCRM among open source projects using it.Read 4 Oct 2026 · github.com
Support
The site directs users who need support to its linked support guidance and says feedback email is not for support requests.Read 4 Oct 2026 · mosaico.email
Maker
The site says Mosaico is brought to users by Italian email marketing firm VOXmail.it.Read 4 Oct 2026 · mosaico.email
Custom templates
Mosaico supports custom templates through a template language that can make an HTML design work with the editor.Read 4 Oct 2026 · mosaico.email
Customization
Users can personalize the overall theme and customize individual element styles.Read 4 Oct 2026 · mosaico.email
Editing controls
Mosaico provides a global undo and redo system.Read 4 Oct 2026 · mosaico.email
Image handling
The editor supports drag and drop image uploads and automatically resizes images to fit available space.Read 4 Oct 2026 · mosaico.email
Image hosting limit
The site says hotlinking images from mosaico.io is disallowed and asks users to download and host images themselves.Read 4 Oct 2026 · mosaico.email
Open source license
The official site says Mosaico is distributed under the GPL license and links to its complete codebase on GitHub.Read 4 Oct 2026 · mosaico.email
Responsive templates
The site says its responsive, tested templates work with all major email clients and devices.Read 4 Oct 2026 · mosaico.email
Template driven editing
The project README says templates define which content and styles can be edited in Mosaico.Read 4 Oct 2026 · github.com

Plans and prices

Mosaico Free Open source email template builder · GPL license Read 4 Oct 2026 · mosaico.email

Every Mosaico plan and price →

Strong points and limits

Strong points

  • GPL-licensed open source software
  • Responsive templates for major email clients and devices
  • Drag-and-drop image uploads with automatic resizing
  • Custom HTML templates supported
  • HTML export available

Limits

  • Images from mosaico.io cannot be hotlinked
  • Self-hosting requires deployment work
  • Feedback email is not for support requests

Who it suits

It suits developers, template authors, end users, and UI/UX designers who need an open source, self-hosted or web-based email editor.

Verdict

Mosaico provides flexible template-driven email editing without a license fee. It is most suitable when you can host images yourself and manage deployment or local builds.

Where Specifiction places it

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