Sozi

Sozi is a free presentation editor and player for SVG documents, designed for audiences that need to move across a visual canvas rather than advance through a fixed slide stack. It is strongest for diagram-heavy or spatially connected material, while its archive-style Windows delivery, uneven Linux packaging, and evolving documentation make it less suitable for teams that expect a polished installer and conventional support.

Overview

Sozi lays artwork out on a poster and guides viewers with translations, zooms, and rotations. That spatial model can show relationships between elements more naturally than a sequence of isolated slides, but it requires authors to plan a path through a free-form canvas. SVG is the foundation, so it fits people already comfortable creating or editing vector artwork better than users seeking a general-purpose slide authoring environment.

The editor can create and save frames, undo and redo changes, and let users modify keyboard shortcuts in preferences. Presentations can be placed in an HTML page through an iframe and controlled by JavaScript from the containing page, making Sozi useful for interactive web experiences as well as live presenting.

Key features

• Free-form frame navigation: Frames define a route through a poster using movement, magnification, and rotation. This favors connected visual stories, maps, and diagrams; material that depends on a strict, familiar slide order may be harder to organize.
• Integrated conversion: Since version 21.02, the editor includes conversion to PDF and video. Those outputs make a zooming presentation easier to distribute as a document or movie, rather than limiting it to live playback.
• Presenter mode and offline use: Sozi supports presenter mode and offline access, useful when presenting without a dependable connection.
• Web embedding: An iframe and JavaScript control allow a presentation to live inside another website, giving developers more control than a standalone player.
• SVG workflow: Sozi is specifically a presentation tool for SVG documents. A Docker installation can bundle Sozi with Inkscape and presentation-conversion tools, which may simplify a self-hosted workflow for users who also need vector editing and conversion utilities.
• Open license: The software is distributed under the Mozilla Public License 2.0. Development is mainly handled by one person with regular or occasional contributors, and user support is available through the Sozi users forum.

Pricing

Sozi is free software with no trial period because there is no paid tier to trial. The “Free and open source” plan costs nothing and includes the zooming presentation editor and player under MPL-2.0. The “Sozi” plan also costs nothing; it is free software, with donations accepted rather than a purchase requirement. There are no paid seats, usage quotas, or renewal terms to budget for. Users who want to support development can donate through Buy Me a Coffee, PayPal, or Liberapay.

Platforms

Sozi supports the web, Windows, macOS, and Linux. Desktop installation instructions cover GNU/Linux, Windows, and OS X. Windows users receive a zip archive rather than an installer, so deployment is a manual unpacking step. Linux distribution repositories may carry very old versions, and documentation and support do not apply to those outdated packages; obtaining a current release from the project is the safer choice. Offline access is supported, while web embedding covers browser-based delivery.

Who it's for

Choose Sozi if your presentations use SVG artwork and benefit from moving around a deliberately arranged poster. It suits educators, technical explainers, designers, and web publishers who value spatial navigation, PDF or video conversion, and the ability to embed a presentation in an HTML page. It is a weaker fit for people who want a conventional slide editor, a Windows installer, or a mature commercial support structure. The documentation is being rewritten as an online book at sozi.guide, so newcomers should expect guidance to evolve.

Pros and cons

• Pros: Free and open-source under MPL-2.0; poster-based zooming, panning, and rotation support visual relationships; PDF and video conversion is built into the editor; presenter mode and offline access support live use; iframe embedding and JavaScript control suit web integration.
• Cons: The SVG-centered workflow is less approachable for ordinary slide-deck authors; Windows is distributed without an installer; Linux repositories may provide unsupported, outdated builds; documentation is undergoing a rewrite; development relies mainly on one person and occasional contributors.

Alternatives

For a broader selection, see Animated Presentation Software and Presentation software.

• Animaker is a freemium web, Android, iOS, and API option with a free plan that includes basic animation tools, limited premium assets, and watermarked exports; choose it when character-oriented animation matters more than an SVG poster workflow.
• Focusky offers freemium presentation software for Android, iOS, macOS, and Windows, with a free plan limited by 10G storage, 50 uploads per month, watermarked publishing, and restricted output and online features; pick it when you prefer a managed cloud presentation service.
• HeyGen is a freemium Android, iOS, web, and API service whose free plan allows up to three one-minute videos per month; choose it for presenter-style AI video rather than author-controlled SVG navigation.
• OpenDeck is free forever across Android, iOS, macOS, web, and Windows with no in-app purchases; consider it when broad platform coverage and a straightforward free model matter most.
• Powtoon is a freemium animation platform with a free plan capped at 720p, three-minute projects, and watermarked exports; choose it for template-driven animated content.
• Decks.Studio offers a free plan with three decks per month, five AI refinements per day, one agent-mode run per month, watermarked PDF export, and no PPTX or DOCX export; pick it for AI-assisted deck creation.
• Animiz is a Windows-only freemium tool whose free plan allows one user, 10G storage, five scenes per project, low-resolution video and GIF output, and watermarks; choose it for scene-based animation on Windows.
• Emaze is a web-based freemium presentation platform with paid tiers that expand project and quiz limits; choose it when browser-first publishing and presentation templates are the priority.

Verdict

Sozi is the right choice for an SVG-savvy presenter who wants to navigate a freely arranged poster and export the result to PDF or video without paying for software. Look elsewhere if your priority is a standard slide workflow, an installer-led Windows deployment, or a more established documentation and maintenance model.