Voxel Builder

Voxel Builder is a voxel-based 3D modeling application for making, editing, and rendering voxel scenes. Its generators create terrain, cubes, spheres, and isometric forms; modeling tools include symmetric drawing and painting, transforms, and color groups. Rendering options include a Three.js sandbox, GPU path tracer, basic PBR rendering, and post-process effects. The app can voxelize GLB, OBJ, STL, and PLY models, as well as images and Unicode or emoji text. Projects can be saved and loaded in JSON or MagicaVoxel VOX formats, then exported as GLB, GLTF, OBJ, STL, or PLY. Local storage, snapshots, quicksave, undo and redo, and ZIP snapshot backups are available. The project includes a Blender importer script, and baked GLB meshes can be used in Blender and other 3D software. It is free under GPL-3.0 and is described as ad-free, without trackers or logging, and usable online or offline. Browser use is supported on desktop and mobile; Electron downloads are listed for Linux x64 and Windows x64. High voxel volumes can lower frame rates, browser storage is limited, and geometry animations are not supported for GLB voxelization.

Voxel Builder provides modeling, rendering, and conversion tools with broad file-format support. Consider its performance and browser storage limits when working with dense scenes.

It suits people creating voxel models who want a free browser-based or Electron tool with several import and export formats. The project recommends a tablet with a pen or a Wacom tablet for the best experience.

Overview

Voxel Builder is a free voxel-based 3D modeling app for people building block-based scenes or converting existing assets into voxels. It suits makers who want modeling, rendering, and export tools across desktop and mobile; its main trade-off is that dense scenes can strain performance and browser storage.

Key features

Modeling and conversion

Terrain, cube, sphere, and isometric generators provide several starting points, while interactive tools, symmetry, voxel transforms, color groups, and texture painting support more deliberate editing. That range makes the app useful for both creating scenes and refining them, but it has no animation tools.

Voxelization accepts GLB, OBJ, STL, and PLY models, plus images and Unicode or emoji text. This lets users bring varied source material into a voxel workflow. GLB geometry animations are unsupported; when mesh merging errors occur, the project recommends merging meshes with matching properties before export.

Rendering and project handoff

A Three.js sandbox, GPU path tracer, basic PBR rendering, and post-process effects give users multiple ways to present a scene. The breadth is useful for preview and output, though dense scenes can raise GPU load, and the project reports lower frame rates at high voxel volumes.

Projects save and load as JSON or MagicaVoxel VOX files, with local storage, snapshots, quicksave, undo, and redo. Snapshot backups can be shared in ZIP archives. Export options include GLB, GLTF, OBJ, STL, and PLY; a Blender importer script and baked GLB meshes extend the handoff to Blender and other 3D software. Game engine export is supported.

Pricing

Voxel Builder is free, with a free plan. No paid tier is described, so there are no paid-plan seat counts, quotas, or renewal terms to weigh. The practical limits are instead performance and storage: high voxel volumes can lower frame rates, while browser storage is limited. Electron is recommended for larger scenes and greater storage capacity.

Platforms

Voxel Builder runs in Chrome and Firefox on desktop and mobile, and is PWA add-to-home-screen ready. Electron downloads are provided for Linux x64 and Windows x64. The project describes the app as usable online or offline. For the best experience, it recommends a tablet with a pen or a Wacom tablet; this favors pen-based work over mouse-only use.

Who it's for

Voxel Builder is a strong fit for voxel artists who need broad import and export options, want to render scenes, or move baked meshes into Blender and other 3D software. Its free access and multiple platform options also suit people trying voxel modeling without committing to a paid editor. It is a weaker choice for animation work, very dense scenes in a browser, or workflows that depend on importing animated GLB geometry.

The project describes itself as ad-free, without trackers or logging, and releases its code under GPL-3.0.

Pros and cons

• Pros: Free use combines multiple generators, painting and transforms, several rendering approaches, and broad import and export formats.
• Pros: JSON and VOX project support, snapshots, quicksave, and ZIP snapshot backups give users several ways to preserve or share work.
• Cons: High voxel volumes can reduce frame rates and increase GPU load, making dense work less suitable for browser use.
• Cons: Browser storage is limited, and GLB geometry animations cannot be voxelized.
• Cons: There are no animation tools, so users needing animation must look elsewhere.

Alternatives

Voxel Editors is a broader category to browse when you want to compare more options.

• Mega Voxels is an alternative for Android and iOS users; it has a free app download and offers premium content licenses through a weekly plan.
• Goxel is worth considering if you want a free desktop version with a scene size described as unlimited, or need its listed macOS support.
• Voxel Max may suit iOS or macOS users who want a 256 × 256 × 256 workspace and are considering a paid editor.
• Qubicle Voxel Editor is another option for macOS and Windows users, with a free demo and a paid offering.
• VoxelAI Studio is a web and API alternative with a free token allowance and one-time token top-ups.
• Blockhammer offers a free early-access voxel editor for Linux, macOS, and Windows.
• Facet may fit users who want a browser-based demo that saves JSON projects, with one-click OBJ export in its full version.
• pixemboss is a free in-browser editor that needs no installation or account to get started.

Verdict

Choose Voxel Builder if you want a free, cross-platform voxel editor that pairs modeling with rendering, conversion, and flexible file handoff. Its strongest reason to choose is the breadth of its workflow without a paid plan; look elsewhere if your work depends on animation, animated GLB voxelization, or reliably smooth performance and generous storage for dense browser-based scenes.