Voxel Builder

Overview

Voxel Builder is a voxel-based 3D modeling app for artists and makers who want to build scenes from blocks or convert existing assets into voxel form. Its broad import, rendering, and export toolkit makes it a capable free option, though dense projects and browser storage can become constraints.

Key features

Modeling and conversion

Terrain, cube, sphere, and isometric generators give projects a quick starting point, while interactive tools, symmetric drawing and painting, voxel transforms, and color groups support more deliberate scene work. It also supports texture painting. This mix suits both fresh block-based modeling and edits to existing voxel scenes, but it does not include animation tools.

Voxelization accepts GLB, OBJ, STL, and PLY models, as well as images and Unicode or emoji text. That flexibility is useful for turning varied source material into voxel scenes. GLB geometry animations are unsupported; if mesh merging errors arise, the project recommends combining meshes with matching properties before export.

Rendering, saving, and handoff

Rendering choices include a Three.js sandbox, GPU path tracer, basic PBR rendering, and post-process effects. This is a broader presentation toolkit than a bare voxel editor, although dense scenes can increase GPU load. The project reports lower frame rates at high voxel volumes and recommends Electron for larger scenes.

Projects can be saved and loaded as JSON or MagicaVoxel VOX files, with exports to GLB, GLTF, OBJ, STL, and PLY. Local storage, snapshots, quicksave, undo and redo, and ZIP snapshot backups help preserve work. Browser storage is limited, so Electron is the better fit for projects needing more capacity. A Blender importer script and baked GLB meshes provide routes into Blender and other 3D software.

Privacy and licensing

Voxel Builder describes itself as ad-free, without trackers or logging, and its code is released under GPL-3.0. It is intended to work online or offline. The project recommends a tablet with a pen or a Wacom tablet for the best experience, a sensible consideration for drawing-focused work.

Pricing

Voxel Builder is free, with a free plan and no paid tier described. That makes its full modeling and conversion toolkit accessible without a subscription, but browser users still face storage limits; Electron is recommended for higher capacity. The project lists Electron downloads for Linux x64 and Windows x64.

Platforms

Voxel Builder supports Android, iOS, Linux, web, and Windows. It is PWA add-to-home-screen ready, and Chrome and Firefox are supported on desktop and mobile. Electron is available for Windows and Linux. The project recommends a pen-equipped tablet or Wacom tablet for the best experience, while high-volume scenes are better suited to Electron than a browser session.

Who it's for

Voxel Builder is a strong fit for people who want a free editor that combines voxel construction, conversion from common 3D formats, multiple rendering options, and handoff to Blender or other 3D software. It is less suited to animation workflows, animated GLB conversion, or consistently smooth work on very dense scenes. Tablet users with a pen get the recommended input setup; those working on larger projects should favor Electron over browser storage.

Pros and cons

• Pros: Free access to modeling, voxelization, rendering, and multiple export formats makes it useful across more than one stage of a voxel workflow.
• Pros: JSON and MagicaVoxel VOX project files, snapshots, undo and redo, and ZIP backups give several ways to preserve and move work.
• Pros: The Blender importer, baked GLB meshes, offline use, and ad-free, tracker-free design broaden its practical appeal.
• Cons: High voxel volumes can reduce frame rates and increase GPU load, making dense scenes a poor fit for constrained performance.
• Cons: Browser storage is limited, so larger projects are better handled in Electron.
• Cons: GLB geometry animation is unsupported during voxelization, and the app has no animation tools.

Alternatives

Goxel is another free option for Android, iOS, Linux, macOS, and Windows; choose it if macOS support or its desktop version's described unlimited scene size matters more than Voxel Builder's stated conversion and rendering features.

Crocotile 3D is a paid option with a free trial for Linux, macOS, and Windows. Choose it if you specifically want to evaluate that product before buying; its registration code is $29.99 USD per month.

Vengi VoxEdit is free and open source, available on Linux, macOS, web, and Windows, and is under development. It may suit readers looking for a free editor on macOS.

Blockhammer is a free voxel editor with Linux, macOS, and Windows downloads, currently in early access. Consider it if an early-access desktop editor is acceptable.

Mega Voxels is a freemium Android and iOS app, with free downloads and content licenses available at no cost. It is a mobile-focused alternative; weekly premium content licenses cost $1.99 USD per month.

MagicaVoxel is a free alternative for Windows and macOS.

The Sandbox Game Maker is a free alternative for Windows and macOS.

Facet is a freemium voxel editor for web and Windows.

Browse more options in Voxel Editors.

Verdict

Choose Voxel Builder if you want a free, cross-platform voxel editor that can create scenes, voxelize varied inputs, render them in several ways, and export to common 3D formats. Its main advantage is the breadth of that workflow in one package; its main reasons to look elsewhere are performance on dense scenes, browser storage limits, and the absence of animation tools.